OPTO 22 SNAP PAC R SERIES User manual

SNAP PAC R-SERIES
CONTROLLER
USER’S GUIDE
SNAP-PAC-R1
SNAP-PAC-R1-B
SNAP-PAC-R1-FM
SNAP-PAC-R1-W
SNAP-PAC-R2
SNAP-PAC-R2-FM
SNAP-PAC-R2-W
Form 1595

SNAP PAC R-SERIES CONTROLLER
USER’S GUIDE
SNAP-PAC-R1
SNAP-PAC-R1-B
SNAP-PAC-R1-FM
SNAP-PAC-R1-W
SNAP-PAC-R2
SNAP-PAC-R2-FM
SNAP-PAC-R2-W
Form 1595-180802—August 2018
43044 Business Park Drive • Temecula • CA 92590-3614
Phone: 800-321-OPTO (6786) or 951-695-3000
Fax: 800-832-OPTO (6786) or 951-695-2712
www.opto22.com
Product Support Services
800-TEK-OPTO (835-6786) or 951-695-3080
Fax: [phone]
Email: [email protected]
Web: support.opto22.com

SNAP PAC R-Series Controller User’s Guide
ii
SNAP PAC R-Series Controller User’s Guide
Form 1595-180802—August 2018
Copyright © 2006–2018 Opto 22.
All rights reserved.
Printed in the United States of America.
The information in this manual has been checked carefully and is believed to be accurate; however, Opto 22 assumes no
responsibility for possible inaccuracies or omissions. Specifications are subject to change without notice.
Opto 22 warrants all of its products to be free from defects in material or workmanship for 30 months from the
manufacturing date code. This warranty is limited to the original cost of the unit only and does not cover installation, labor,
or any other contingent costs. Opto 22 I/O modules and solid-state relays with date codes of 1/96 or newer are guaranteed
for life. This lifetime warranty excludes reed relay, SNAP serial communication modules, SNAP PID modules, and modules
that contain mechanical contacts or switches. Opto 22 does not warrant any product, components, or parts not
manufactured by Opto 22; for these items, the warranty from the original manufacturer applies. Refer to Opto 22 form
1042 for complete warranty information.
Wired+Wireless controllers and brains are licensed under one or more of the following patents: U.S. Patent No(s). 5282222,
RE37802, 6963617; Canadian Patent No. 2064975; European Patent No. 1142245; French Patent No. 1142245; British Patent
No. 1142245; Japanese Patent No. 2002535925A; German Patent No. 60011224.
Opto 22 FactoryFloor, groov, groov EPIC, Optomux, and Pamux are registered trademarks of Opto 22. Generation 4, groov
Server, ioControl, ioDisplay, ioManager, ioProject, ioUtilities, mistic, Nvio, Nvio.net Web Portal, OptoConnect, OptoControl,
OptoDataLink, OptoDisplay, OptoEMU, OptoEMU Sensor, OptoEMU Server, OptoOPCServer, OptoScript, OptoServer,
OptoTerminal, OptoUtilities, PAC Control, PAC Display, PAC Manager, PAC Project, PAC Project Basic, PAC Project Professional,
SNAP Ethernet I/O, SNAP I/O, SNAP OEM I/O, SNAP PAC System, SNAP Simple I/O, SNAP Ultimate I/O, and Wired+Wireless
are trademarks of Opto 22.
ActiveX, JScript, Microsoft, MS-DOS, VBScript, Visual Basic, Visual C++, Windows, and Windows Vista are either registered
trademarks or trademarks of Microsoft Corporation in the United States and other countries. Linux is a registered
trademark of Linus Torvalds. ARCNET is a registered trademark of Datapoint Corporation. Modbus is a registered trademark
of Schneider Electric, licensed to the Modbus Organization, Inc. Wiegand is a registered trademark of Sensor Engineering
Corporation. Allen-Bradley, CompactLogix, ControlLogix, MicroLogix, SLC, and RSLogix are either registered trademarks or
trademarks of Rockwell Automation. CIP and EtherNet/IP are trademarks of ODVA. Raspberry Pi is a trademark of the
Raspberry Pi Foundation. The registered trademark Ignition by Inductive Automation® is owned by Inductive Automation
and is registered in the United States and may be pending or registered in other countries.
groov includes software developed by the OpenSSL Project for use in the OpenSSL Toolkit. (http://www.openssl.org)
All other brand or product names are trademarks or registered trademarks of their respective companies or organizations.
Opto 22
Automation Made Simple.

SNAP PAC R-Series Controller User’s Guide iii
iii
Table of Contents
Chapter 1: Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Ethernet Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Wired+Wireless Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Serial Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
I/O Mounting Racks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Ethernet PAC for Legacy I/O Racks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
SNAP I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
PAC Project Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
PAC Project . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
For Developers: SNAP PAC REST API . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
About this Guide. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Related Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
For Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Chapter 2: Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
What You Will Need. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Installing Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Installing Modules on the Rack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Removing a Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Installing the Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
What’s Next?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Configuring I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Using PPP Over a Modem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Configuring PPP on the Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Attaching the Modem to a SNAP PAC R-Series Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Chapter 3: System Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Communication Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Simultaneous Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Accessing SNAP R-Series Controllers over the Internet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Choosing Communication Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
System Architecture. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Understanding the SNAP PAC R-series Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
The I/O Side of the Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

SNAP PAC R-Series Controller User’s Guide
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The Control Side of the Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Controlling the System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Using Data for Peer-to-Peer Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Communicating with Enterprise Systems and Third-Party Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
The Complete System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Networking. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Connecting the Controller Directly to a PC or Master Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Crossover Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Attaching the Controller to an Existing Ethernet Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Segmenting the Control Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Using the Controller in an Independent Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Communicating with the System via Modem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Using the Controller in a Wireless LAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Network Architecture Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Basic Control Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Network Segmenting: Wired and Wireless Networks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Network Segmenting: Ethernet Connections to Host and I/O Units . . . . . . . . . . . . . . . . . . . . . . . . 27
Ethernet Link Redundancy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Specifications, Connectors, and Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Specifications for SNAP-PAC-R1 and -R2 Controllers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Connectors and LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Connectors and LEDs—Wired+Wireless Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Dimensions for Wired+Wireless Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Information on Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Digital Point Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Analog Point Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Serial Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
PID Loops . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Additional Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
SNAP-PAC-R1 and -R2 Comparison Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Chapter 4: Maintenance and Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Maintaining the SNAP PAC R-Series Controller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Backup Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Changing the Controller’s IP Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Loading New Firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Setting Time and Date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Resetting the Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Using the MicroSD Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Card Type and Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
MicroSD/SDHC Card Uses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Storing and Accessing Data or Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Displaying Free Space on the Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Checking Firmware and Loader Versions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Replacing a Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Updating Firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

SNAP PAC R-Series Controller User’s Guide v
Booting from Firmware on the Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Updating, Running, or Testing a Strategy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Disabling or Enabling Firmware and Strategy Updates Via the Card . . . . . . . . . . . . . . . . . . . . . . . . 53
Blink Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
STAT LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
PPP LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
232 LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
WLAN LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Troubleshooting the SNAP PAC R-Series Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Getting Device and Firmware Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Communicating with the Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Pinging the Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Accessing the Controller with PAC Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Solving Network Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Additional Troubleshooting Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Making Sure the Controller is in Normal Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
TCP Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Troubleshooting I/O Modules: Frequently Asked Questions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
SNAP Digital Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
SNAP Analog Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Appendix A: SNAP Mounting Racks and Power Supplies . . . . . . . . . . . . . . . . . . . . . . . . 65
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
SNAP Mounting Racks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
SNAP Power Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Primary Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Determining Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Wiring the Primary Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Loop Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71

SNAP PAC R-Series Controller User’s Guide
vi

SNAP PAC R-Series Controller User’s Guide 1
1
1: Overview
INTRODUCTION
The affordable and compact SNAP PAC R-series
programmable automation controllers provide powerful,
real-time control and communication to meet your
industrial control, monitoring, and data acquisition and
exchange needs. Part of the Opto 22 SNAP PAC System™, the
R-series PAC is a rack-mounted, industrially hardened unit
that can handle multiple tasks involving digital and analog
control, serial string handling, communication, and
enterprise connectivity.
Used with the included PAC Project Basic software suite (or
PAC Project Professional, purchased separately), the
Ethernet-based SNAP PAC R-series controller runs control
programs written in Opto 22’s PAC Control™software. It can
monitor and control a wide range of devices and equipment
wired to the I/O on its own rack and to I/O on distributed racks equipped with SNAP PAC EB-series brains.
Alternatively, the R-series controller can be used as a slave to a larger, SNAP PAC S-series standalone industrial
controller.
SNAP PAC R-series controllers are well suited to original equipment manufacturers (OEMs), system integrators,
and end-users in process control, discrete manufacturing, or hybrid industries and applications.
Several models are available:
• SNAP-PAC-R1, SNAP-PAC-R1-FM, SNAP-PAC-R1-W, and SNAP-PAC-R1-B each control a mix of SNAP
analog, digital (both standard and high-density), and serial modules. Full digital functions include
high-speed counting; quadrature counting; and pulse, period, and frequency measurement. The -FM and
-B models are Factory Mutual approved. The -W model adds wireless LAN capability (see
“Wired+Wireless Communication” on page 2 for more information). The -B model is designed to mount
on SNAP B-series racks so that older I/O units can be easily upgraded to a newer controller.
• SNAP-PAC-R2,SNAP-PAC-R2-FM, and SNAP-PAC-R2-W also control a mix of SNAP analog, standard
and high-density digital, and serial modules. High-speed digital functions are not included. The -FM
model is Factory Mutual approved. The -W model adds wireless LAN capability (see page 2 for more
information).
Built-in functions and comparisons of the SNAP-PAC-R1 and SNAP-PAC-R2 are shown in the table on page 37.
SNAP-PAC-R1 controller

INTRODUCTION
SNAP PAC R-Series Controller User’s Guide
2
Ethernet Communication
All SNAP PAC R-series controllers communicate over standard 10/100 Mbps Ethernet networks and can be
attached to an existing network. The controllers can also be used in an independent control network built
with standard, off-the-shelf Ethernet hardware.
SNAP PAC R-series controllers include two 10/100 Mbps Ethernet interfaces for networking to Ethernet hosts
and to other I/O units. These independent Ethernet ports have separate IP addresses that can be used with
PAC Project™Professional software to set up redundant network links to safeguard the availability and
reliability of an I/O system, or to segment a control system’s network from the enterprise LAN.
Supported protocols over Ethernet include EtherNet™/IP, Modbus®/TCP, SMTP, SNMP, FTP, and OptoMMP.
Wired+Wireless Communication
SNAP-PAC-R1-W and SNAP-PAC-R2-W controllers add wireless capability to communications. In addition
to the two wired network interfaces, these models have a wireless network interface as well, so each PAC has a
total of three separate IP addresses—two wired and one wireless. Wired+Wireless PAC can be used wirelessly
or on a wired network, or both at once.
For flexibility in designing your wireless network, wireless communication includes support for 802.11a, b, and
g standards. Wired+Wireless PACs can be used with a variety of wireless switches and other infrastructure
hardware. For the best security, the 802.11i WPA2/AES standard is supported, while older WPA and WEP
security standards are included for backwards compatibility.
Because wireless functionality is in the PAC itself, no additional parts are required within the control system for
wireless use. All SNAP PAC racks and SNAP I/O modules can be used either wired or wirelessly. You can switch
from one network to the other without reconfiguring I/O or changing field wiring.
Just like a laptop computer with a wireless connection, all functionality remains the same whether the
Wired+Wireless PAC is used wirelessly or as part of a wired network. Supported protocols remain the same.
And control programs run the same on both networks without reprogramming.
Serial Communication
SNAP PAC R-series controllers provide an RS-232 serial link to support
Point-to-Point Protocol (PPP) modem connections—for creating
TCP/IP networks over serial or PSTN (Public Switched Telephone Network) lines—as
well as remote serial device communication.
The RS-232 serial interface supports either a modem connection using
PPP or general-purpose communication with serial devices, allowing
you to send and receive data from a serial device connected directly to the controller.
For additional serial interfaces, you can add one or more SNAP serial
communication modules on the rack.
NOTE: The R-series controller does not include an RS-485 port and cannot
be used to control Opto 22 serial I/O processors, such as the SNAP PAC
SB-series brains. Use an S-series controller for serial brains.
I/O Mounting Racks
SNAP PAC R-series controllers must be connected to the appropriate
rack to avoid damage to the controller. Both the SNAP-PAC-R1 and R2
are designed to work with SNAP PAC mounting racks, which are available
with 4, 8, 12, or 16 positions for Opto 22 SNAP I/O modules. Part numbers

CHAPTER 1: OVERVIEW
SNAP PAC R-Series Controller User’s Guide 3
are SNAP-PAC-RCK4, SNAP-PAC-RCK8, SNAP-PAC-RCK12, and SNAP-PAC-RCK16. Factory Mutual-approved
versions of these racks, with part numbers ending in -FM, are also available.
Ethernet PAC for Legacy I/O Racks
The SNAP-PAC-R1-B is a PAC-R1 for use with older SNAP B-series racks (only B-series racks with a B in the part
number; not the SNAP-D64RS rack). This PAC provides an upgrade path from legacy brains and rack-mounted
controllers such as the SNAP-B3000-ENET or SNAP-UP1-ADS that use B-series racks. See the SNAP I/O Racks
data sheet (form 0784) for more information on racks.
The SNAP-PAC-R1-B uses the same firmware and has the same functionality as the SNAP-PAC-R1, except that
4-channel digital modules can be placed only in slots 0-7 due to limitations of the rack.
SNAP I/O
The SNAP PAC R-series controllers support all SNAP I/O modules available on our website. SNAP digital I/O
modules contain four input or output points, and SNAP high-density digital modules contain 16 or 32 input or
output points. SNAP analog modules contain 2 to 32 points, depending on the module.
PAC Project Software
PAC Project
SNAP PAC controllers use Opto 22’s PAC Project™, a Windows®-compatible automation software suite for
control system programming, human-machine-interface (HMI) development, and OPC connectivity.
Two versions are available: PAC Project Basic, a free to download from the Opto 22 website
(www.opto22.com); and PAC Project Professional, available for purchase and download from our website.
• PAC Project Basic includes PAC Control™ for developing control programs, PAC Display™ for creating
operator interfaces, and PAC Manager™ configuration software. Documentation is also included.
• PAC Project Professional also includes PAC Manager, and adds expanded versions of PAC Control and
PAC Display, plus two more tools: OptoOPCServer™software for exchanging data with OPC 2.0-compliant
client software applications, and OptoDataLink™for exchanging SNAP PAC System data with databases
(including Microsoft SQL Server®, Microsoft Access®, and MySQL®), text files, and email systems).
Documentation is also included.
You can also purchase PAC Control Professional, PAC Display Professional, OptoOPCServer, and
OptoDataLink separately. For details, see the PAC Project Data Sheet (form 1699).
PAC Control Basic is a graphical, flowchart-based programming tool for machine control and process
applications. Using PAC Control, you create, download, and run strategies on a SNAP PAC controller. In addition
to flowchart programming with subroutine capability, PAC Control includes a powerful, built-in scripting
language based on C and other procedural languages.
PAC Control Professional adds the ability to import legacy OptoControl strategies, support for older mistic™
serial I/O units, and support for the dual independent Ethernet ports on a SNAP PAC controller. A SNAP
R-series controller simultaneously runs up to 16 PAC Control flowcharts, although the PAC Control strategy can
actually contain a much larger number of flowcharts. The total number of flowcharts is limited only by the
memory available for strategy storage.
PAC Display Basic is an intuitive HMI package for building operator interfaces, or projects, for communicating
with a SNAP PAC controller. PAC Display offers a full-featured HMI including alarming, trending, and a built-in
library of 3,000 industrial automation graphics.
PAC Display Professional adds the ability to import projects created in OptoDisplay, part of the legacy
Opto 22 FactoryFloor®software suite, and using redundant Ethernet communication links on SNAP PAC

ABOUT THIS GUIDE
SNAP PAC R-Series Controller User’s Guide
4
controllers. PAC Display Professional can also connect to Ethernet-based FactoryFloor controllers running
OptoControl strategies.
OptoOPCServer is a fast, efficient OPC 2.0-compliant server for communicating with many Opto 22 products,
including SNAP PAC controllers and I/O units, plus legacy Opto 22 Ethernet-based controllers and I/O. Using
OptoOPCServer, you can consolidate data from all these Opto 22 systems into the OPC client software of your
choice, such as third-party HMI and data acquisition packages, and custom software applications you create
with tools such as Visual C++®.
OptoDataLink is a software application that makes it easy to share data from the SNAP PAC System with
commonly used databases, including Microsoft SQL Server, Microsoft Access, and MySQL, as well as text files.
The I/O points and strategy variables already created in your PAC Control strategy are automatically available
for OptoDataLink to use for data exchange.
PAC Manager is a utility application for assigning IP addresses to SNAP PAC controllers and brains, reading or
changing basic controller configuration, and configuring and testing I/O.
For Developers: SNAP PAC REST API
If you’re a developer who’d like to use PAC Control strategy tags in communications with other devices, the
Opto 22 SNAP PAC REST API is a secure and powerful way to do just that. The API is available in SNAP PAC
R-series and S-series controllers with PAC firmware R9.5a and higher. To configure https access to your PAC’s
RESTful server and learn how to call the API, visit developer.opto22.com.
ABOUT THIS GUIDE
This guide shows you how to install and use SNAP PAC R-series controllers. This guide assumes that you have
some familiarity with TCP/IP and Ethernet networking, and also with wireless networking if you are using
Wired+Wireless models. If you are not familiar with these subjects, we strongly suggest you consult
commercially available resources to learn about them before attempting to install or use SNAP PAC R-series
controllers.
If you are using Modbus/TCP for communicating with SNAP PAC R-series controllers, this guide assumes that
you are already familiar with Modbus/TCP. See the Modbus/TCP Protocol Guide (form1678) for additional
information.
If you are using EtherNet/IP for communication, you should already be familiar with EtherNet/IP. See the
EtherNet/IP for SNAP PAC Protocol Guide (form 1770).
The following sections are included in this user’s guide:
Chapter 1: Overview—information about the guide and how to reach Opto 22 Product Support.
Chapter 2: Installation—quick-start steps to get SNAP PAC R-series controllers up and running quickly.
Chapter 3: System Information—conceptual information on networking and communicating with SNAP
PAC R-series controllers; descriptions of features, capabilities, and specifications for SNAP PAC R-series
controllers.
Chapter 4: Maintenance and Troubleshooting—assigning and changing IP addresses, resetting the
controller to factory defaults, using the microSD slot, upgrading firmware, and tips for resolving difficulties you
may encounter while working with SNAP PAC R-series controllers.
Appendix A: SNAP Mounting Racks and Power Supplies— wiring diagram examples for assembling your
SNAP PAC R-series controller, SNAP PAC rack, and power supply.

CHAPTER 1: OVERVIEW
SNAP PAC R-Series Controller User’s Guide 5
RELATED DOCUMENTATION
You’ll find most—if not all—of the documentation to build and maintain your control system in the
PAC Project folder that’s added to your Windows Desktop when you install PAC Project. While using
PAC Project applications, online help is available by clicking Help in the menu bar or the Help buttons in dialog
boxes, or simply by pressing the F1 key.
Here's a brief list of documents you may find helpful. You can also download other documents, samples files,
software utilities, technical notes, integration kits, and much more from the Opto 22 website.
TIP: To find other documents on our website, try searching on the form number.
FOR HELP
If you have problems installing or using SNAP PAC R-series controllers and cannot find the help you need in
this guide or on our website, contact Opto 22 Product Support.
Phone: 800-TEK-OPTO (800-835-6786 toll-free
in the U.S. and Canada)
951-695-3080
Monday through Friday,
7 a.m. to 5 p.m. Pacific Time
Fax: [phone]
For this information See this guide Form #
Designing flowchart-based control programs for the
system
PAC Control User’s Guide11700
PAC Control Command Reference11701
PAC Control Commands Quick Reference 1703
Configuring SNAP I/O points and system functions PAC Manager User’s Guide11704
Securely accessing data in the PAC via its REST API developer.opto22.com –
Programming your own applications by using either:
•The OptoMMP protocol for memory-mapped
controllers and brains
•One of the OptoMMP Software Development Kits
(SDKs)
OptoMMP Protocol Guide 1465
Using redundant controllers SNAP PAC System Redundancy User’s Guide 1831
Installing and using SNAP PAC S-series controllers SNAP PAC S-series Controller User’s Guide 1592
Installing and using SNAP PAC R-series controllers SNAP PAC R-series Controller User’s Guide 1595
Installing and using SNAP PAC EB- and
SB-series brains SNAP PAC Brains User’s Guide 1690
Communicating with I/O units using OPC OptoOPCServer User’s Guide2 1439
Communicating with I/O units using Modbus/TCP Modbus/TCP Protocol Guide 1678
Communicating with I/O units using EtherNet/IP EtherNet/IP for SNAP PAC Protocol Guide 1770
Moving to the SNAP PAC System with older hard-
ware and software SNAP PAC System Migration Technical Note 1688
1 If you are using SNAP PAC S-series controllers with legacy I/O units (for example, mistic I/O units or Ultimate
I/O), use the Legacy versions of these documents instead:
•Legacy Edition, PAC Control User’s Guide, form 1710
•Legacy Edition, PAC Control Command Reference, form 1711
•Legacy Edition, PAC Manager User’s Guide, form 1714
2 Included with the purchase of OptoOPCServer.
NOTE: Email messages and phone calls
to Opto 22 Product Support are
grouped together and answered in the
order received.

FOR HELP
SNAP PAC R-Series Controller User’s Guide
6
Email: suppor[email protected]
Opto 22 website: www.opto22.com
When calling for technical support, be prepared to provide the following information about your system to
the Product Support engineer:
•Version of this product
•PC configuration (type of processor, speed, memory, operating system)
•Complete description of your hardware system, including:
– Jumper configuration
– Type of power supply
– Types of I/O units installed
– Controller firmware version
– Specific error messages

SNAP PAC R-Series Controller User’s Guide 7
7
2: Installation
If you already know how you will use the SNAP PAC R-series controller and want to get it running quickly,
follow the sections in this chapter.
To learn about communication options and networking, start on page 13. Specifications are listed on page 29.
WHAT YOU WILL NEED
You’ll need the following items to install a SNAP PAC R-series controller:
•A PC running one of the following operating systems:
– Microsoft® Windows® 10 Professional (32-bit or 64-bit)
– Microsoft Windows 7 Professional (32-bit or 64-bit)
• For an Ethernet connection, the PC also needs a 10/100 MB Ethernet adapter card, the TCP/IP protocol
installed, and a valid IP address, on the same subnet as the brain. (For more information, see
“Networking” on page 22.) In addition, you need a standard Ethernet cable for direct connection to the
PC (recommended), or an available connection to a standard 10BASE-T or 100BASE-TX Ethernet network.
•NOTE: Wired+Wireless models must be initially configured using a wired interface. Once IP addresses and
wireless communication parameters are set, the brain can be used wirelessly.
•SNAP PAC R-series controller
•SNAP PAC mounting rack and SNAP I/O modules. Choose rack and modules based on your needs.
(Exception: a SNAP-PAC-R1-B uses a B-series rack, not a SNAP PAC rack.)
•A SNAP-PS5 or SNAP-PS5U power supply or other 5 VDC power supply (5.0 to 5.2 VDC at 4.0 A) applied to
the rack. Additional power may be required for SNAP I/O modules and depends on the number and type
of modules used. For more information, see “Determining Power Requirements”on page 67.
•(Recommended) PAC Project Basic or PAC Project Professional (available from the Opto22 website)
INSTALLING HARDWARE
Assemble the rack and power supply according to the directions that came with them. For help with wiring,
see the product data sheets, which are available on our website at www.opto22.com.
Installing Modules on the Rack
CAUTION: Make sure you are using the correct rack for your controller. All SNAP PAC R-series controllers except the
SNAP-PAC-R1-B use a SNAP PAC rack. SNAP-PAC-R1-B uses a B-series rack (with a B in the part number; this controller
does not work on a SNAP-D64RS rack). Using the wrong rack will severely damage the controller.

INSTALLING HARDWARE
SNAP PAC R-Series Controller User’s Guide
8
Modules snap into position in the row of connectors on the SNAP PAC rack. Each module connector has a
number.
NOTE: R-series controllers with serial numbers lower than 600,000, and all SNAP-PAC-R1-B controllers, are limited to
eight 4-channel digital modules per rack, located in the first eight positions.
1. Place the rack so that the module connector numbers are right-side up, with zero on the left.
2. Position the module over the module connector, aligning the small slot at the base of the module with
the retention bar on the rack.
3. With the module correctly aligned over
the connector, push on the module to
snap it into place.
When positioning modules next to each
other, be sure to align the male and
female module keys (shown in the
detailed view in the illustration at right)
before snapping a module into position.
Modules snap securely into place and
require a special tool (provided) to
remove them. To remove a module, see
the next section.
4. (Optional) Use standard 4-40 x 1/4
truss-head Phillips hold-down screws to
secure both sides of each module. Do not
over-tighten screws.
5. Plug the wiring connector into each
module to attach modules to the devices
they monitor.
See the wiring diagrams in the module’s data sheet.
6. Continue with “Installing the Controller” on page 9.
Controller
connector
Module
position zero
Retention bar
Module connectors
SNAP PAC racks are shown in all illustrations.
Optional hold-
down screws
Module keys

CHAPTER 2: INSTALLATION
SNAP PAC R-Series Controller User’s Guide 9
Removing a Module
1. If the modules are held in place with screws,
remove them.
2. Holding the SNAP module tool (provided) as
shown in the illustration at right, insert it into
the notch at the base of the module.
3. Squeeze the module tool against the module
to open the release latch, and pull straight up
on the module to remove it.
Installing the Controller
CAUTION: Make sure you are using the correct rack
for your controller. All SNAP PAC R-series controllers
except the SNAP-PAC-R1-B use a SNAP PAC rack (or a legacy SNAP M-series rack). SNAP-PAC-R1-B uses a B-series rack
(with a B in the part number; this controller does not work on a SNAP-D64RS rack). Using the wrong rack will severely
damage the controller.
1. Remove the controller from its packaging.
2. Turn off power to the rack assembly.
3. Align the controller connector with the mating
connector on the mounting rack.
4. Seat the controller onto the connector and use
the hold-down screw to secure the controller in
position. Torque: 8 lbf-in (0.9 N-m). Do not
overtighten.
5. Using Category 5 or superior solid unshielded
twisted-pair cable, connect the controller in one
of the following ways:
– (Recommended for initial configuration)
Connect to a PC directly, using an Ethernet
crossover cable.
NOTE: Wired+Wireless models must be configured using a wired network before they can be used on a wireless
network.
NOTE: If you use a crossover cable, make sure to assign a fixed IP address to the network card (NIC) on your
computer. Otherwise, if your network card is configured to get its IP address via DHCP, when you unplug the
computer from the network, the computer will no longer have an IP address. When you are finished using the
crossover cable, you can change the setting back to DHCP.
– Connect to a standard 10BASE-T or 100BASE-TX Ethernet network that has a PC on the same subnet
as the controller and does NOT have a Dynamic Host Configuration Protocol (DHCP) server.
NOTE: When connecting the controller to a managed switch, make sure the managed switch's port
configuration is set to Auto for the Duplex setting and Auto for the Speed setting.
Maximum cable or segment length is 100 meters; minimum cable length is one meter. For more
information on cables, see page 22.
6. For controllers used with a modem: Follow the steps in “Using PPP Over a Modem”on page 11.

WHAT’S NEXT?
SNAP PAC R-Series Controller User’s Guide
10
7. See the Appendix (page 65) for information on power supplies and wiring.
8.
Before turning on power to the controller, follow steps in the PAC Manager User’s Guide (form 1704) to
assign the controller an IP address to the controller (required for both standard and Wired+Wireless
models).
WHAT’S NEXT?
To start configuring controllers and I/O points, see “Configuring I/O,” below.
To learn more about SNAP PAC R-series controller capabilities and network options, see Chapter 3: System
Information.
To create PAC Control strategies to run on the controller, see the PAC Control User’s Guide (form 1700) and the
PAC Control Command Reference (form 1701). Both are available in PDF format and you can download them
free from our website, www.opto22.com.
To securely access data from I/O points and strategy variables in the PAC via its RESTful API (application
program interface based on the REST architecture), see developer.opto22.com.
To work with the following items on the controller, see instructions in the PAC Manager User’s Guide:
•File system and FTP
•Security settings
•Port and interface configuration, including wireless communication for a Wired+Wireless model
To use OLE for process control (OPC) with SNAP PAC R-series controllers, purchase OptoOPCServer and see the
OptoOPCServer User’s Guide (form 1439, available with purchase of OptoOPCServer).
To communicate with controllers using Modbus/TCP, see the Modbus/TCP Protocol Guide (form1678).
To communicate with an Allen-Bradley Logix PLC or other system using EtherNet/IP, see the EtherNet/IP for
SNAP PAC Protocol Guide (form 1770).
To program your own applications, see the OptoMMP Protocol Guide (form 1465).
Configuring I/O
No matter how you communicate with SNAP PAC R-series controllers, you will need to configure I/O points
and controller features.
If you are not using PAC Control (Opto 22’s flowchart-based control software), follow instructions in the
PAC Manager User’s Guide (form 1704).
If you are using PAC Control, I/O units and points must be configured to match the PAC Control strategy
you will run. You can configure most controller features and point functions either in PAC Control or in PAC
Manager.
In most cases, if you are already in PAC Control, configuration is easier there and you can use the loopback IP
address for SNAP PAC R-series controllers controlling themselves. However, some functions cannot be
configured in PAC Control.
If you use PAC Manager, you can save your configuration to a file, load it to multiple I/O units at once, and use
it for referencing points in OPC. You can also configure some controller features that are not available in PAC
Control. However, you cannot use the loopback address in PAC Manager.

CHAPTER 2: INSTALLATION
SNAP PAC R-Series Controller User’s Guide 11
Choose your configuration tool based on what you need to do:
Whichever tool you use for configuring I/O, be aware of the impact if you later change configuration. For
example, if you configure I/O in PAC Manager, download the configuration file to I/O units, and then later add
a point in PAC Control, remember that your configuration file doesn’t contain that point.
USING PPP OVER A MODEM
Use the rest of this chapter only if you have SNAP PAC R-series controllers installed at remote locations or in
other places where an Ethernet network is not available, and you are using modems to communicate
between the controller and a PC. The modems use the point-to-point protocol (PPP) to communicate. You
can set up communication so that the controller can dial in to a PC, so that PCs can dial into the controller, or
both.
NOTE: You can communicate with a SNAP PAC R-series controller using a modem and PPP at the same time you are
communicating with the controller over an Ethernet network.
Here’s how to set up PPP:
1. Use PAC Manager to assign an IP address to the SNAP PAC R-series controller, following the instructions in
the PAC Manager User’s Guide.
2. Follow steps in the next section to configure PPP.
3. Attach the modem to the system, following the steps below.
4. Set up Windows dial-up networking on the PC.
Use PAC Control for I/O configuration if… Use PAC Manager for I/O configuration if…
•You have only one I/O unit or I/O unit configurations are
different.
•The strategy will run on I/O units that are controlling
themselves using the loopback IP address (127.0.0.1).
•You are using a wired Ethernet network for communications.
•The strategy handles all logic; you are not also configuring
events and reactions on I/O units.
•You have multiple I/O units whose configurations are exactly
the same or similar.
•You are using a wireless LAN, a modem connection (PPP), or
SNMP.
•You are using event messages or email.
•You are configuring events and reactions on the I/O unit in
addition to strategy logic.
•You are using OPC to communicate with I/O units.
•You are not using PAC Control.
PC dials in to
controller
SNAP PAC R-series
controller
Modem
Modem
PC with dial-up
networking
Modem

USING PPP OVER A MODEM
SNAP PAC R-Series Controller User’s Guide
12
Configuring PPP on the Controller
To configure PPP on the SNAP PAC R-series controller, see instructions in the PAC Manager User’s Guide
(form 1704). Also use this guide to assign an IP address to the Ethernet ports, configure points, and store
configuration to flash.
Attaching the Modem to a SNAP PAC R-Series Controller
Once the controller and I/O points are configured and communication has been tested, follow these steps to
attach the modem to the controller. To work properly with the controller, a modem must be able to store
settings in non-volatile RAM (NVRAM) and default to those settings on reset.
IMPORTANT: Any modem used with the controller must implement the Carrier Detect (CD) signal or use a custom
cable that connects CD to Data Terminal Ready (DTR) on the controller side.
1. Use the following diagram to attach the modem to the controller using the serial connector. As shown
here, you can use either a DB9 or a DB25 connection.
NOTE: Pins 3 and 6 are tied together within the SNAP PAC R-series controller, so no external jumper is required.
2. Store configuration settings to the modem’s NVRAM, following instructions in the user’s guide for your
modem.
NOTE: Configuration settings must be stored to the modem’s NVRAM so they will be loaded when the SNAP PAC
R-series controller sends a reset command to the modem.
3. If PCs will dial up the controller, set up Windows dial-up networking on the PCs that will call the
controller.
Modem
DB25
TD 2
RD 3
RTS 4
CTS 5
SG 7
CD 8
DTR 20
Controller
1TX
2RX
4RTS
5 CTS
3 or 6 COM
8 DCD
7 DTR
Modem
DB9
DCD 1
RX 2
TX 3
DTR 4
RTS 7
CTS 8
SG 5
Controller
8 DCD
2RX
1TX
7 DTR
4RTS
5 CTS
3 or 6 COM