OPTO 22 B3000-B User manual

B3000-B SERIAL BRAIN
USER’S GUIDE
Form 1781-170202—February 2017
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: [e-mail]
Web: support.opto22.com

B3000-B Serial Brain User’s Guide
ii
B3000-B Serial Brain User’s Guide
Form 1781-170202—February 2017
Copyright © 1997–2017 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, 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.
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.

B3000-B Serial Brain User’s Guide iii
iii
Table of Contents
Chapter 1: Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
About this Guide. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
For Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Chapter 2: Configuration and Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Serial Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Setting Up Serial Networking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Setting the Address and Communication Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Binary Mode with CRC16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
ASCII Mode with CRC16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Binary Mode with Checksum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
ASCII Mode with Checksum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Addressing I/O. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Digital and Analog I/O Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Chapter 3: Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Communication Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Wiring to a SNAP-PAC-S1 Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Wiring to a SNAP-PAC-S2 Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Wiring to a PCI-AC48 Adapter Card in a PC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Chapter 4: Maintenance and Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Maintaining the B3000-B Serial Brain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Loading New Firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Resetting the Brain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
LED Indicators and STAT LED Blink Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Green . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Orange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Red and Green . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Red . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Troubleshooting a B3000-B Brain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Troubleshooting Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Making Sure the Brain is in Normal Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

B3000-B Serial Brain User’s Guide
iv

B3000-B Serial Brain User’s Guide 1
1
Chapter 1
1: Introduction
The B3000-B is a mistic serial brain designed as a
B3000 replacement that is compatible with
FactoryFloor controllers running OptoControl
strategies and SNAP B-series mounting racks. The
B3000-B has the same functionality as the B3000,
except that it does not support the Optomux protocol.
Customers requiring an Optomux brain should use
Opto 22’s E1 or E2 brain.
The B3000-B can be connected to a SNAP PAC
S-series controller, and it can be migrated with other
mistic I/O units to PAC Project. However, if you are
building a new SNAP PAC system with distributed I/O,
you should use SNAP-PAC-SB1 and SB2 serial brains
instead of the B3000-B.
For information on SNAP PAC SB-series brains, see
form 1690, the SNAP PAC Brains User’s Guide. For
information on the earlier B3000 serial brain, see form
0787, the SNAP Analog/Digital Mistic/Optomux Brain Data Sheet. For information on migrating to the
SNAP PAC System, see form 1688, the SNAP PAC System Migration Technical Note. All documents are
available on our website, www.opto22.com. The easiest way to find them is to search on the form
number.
About this Guide
This guide includes the following chapters show you how to configure and wire the B3000-B:
Chapter 1: Introduction—information about the guide and how to reach Opto 22 Product
Support.
Chapter 2: Configuration and Communication—quick-start steps to get B3000-B brains up and
running quickly.
Chapter 3: Wiring—recommended communication cables and wiring diagrams.
Chapter 4: Maintenance and Troubleshooting—resetting the brain to factory defaults,
upgrading firmware, blink codes, and other troubleshooting assistance.

FOR HELP
B3000-B Serial Brain User’s Guide
2
For Help
If you have problems installing or using SNAP PAC brains 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]
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:
•Software and version being used
•Brain and controller firmware version (as applicable)
•PC configuration (type of processor, speed, memory, and operating system)
•A complete description of your hardware and operating systems, including:
– loader and firmware versions for the brain, and date code
– for an Ethernet network, IP addresses and subnet masks for devices on the system
– for a serial network, addressing and communication parameters
– type of power supply
– third-party devices installed (for example, barcode readers)
•Specific error messages seen
NOTE: Email messages and phone
calls to Opto 22 Product Support
are grouped together and
answered in the order received.

B3000-B Serial Brain User’s Guide 3
3
2: Chapter 2
2: Configuration and
Communication
This chapter describes the B3000-B serial port, how to set up serial networking, how to set the
address and communications options for the brain, and how the brain addresses the I/O.
Serial Port
The communications port on a B3000-B is RS-485, either 2-wire or 4-wire. Baud rate, termination,
and address are set using the switches on the brain’s top cover. To configure the B3000-B, see the
next section, “Setting Up Serial Networking.”
For serial cable recommendations and wiring, see Chapter 3: Wiring.
Wiring of IRQ + and IRQ - (pins 6 and 7) is optional and is only needed when using mistic interrupts.
Serial Port
Setting Up Serial Networking
Setting the Address and Communication Options
Addressing I/O
(below)
page 4
page 5
page 8
Serial port connector pinout
Pin 1
TX/RX+
TX/RX–
COM
RX+
RX–
IRQ+
IRQ–

SETTING UP SERIAL NETWORKING
B3000-B Serial Brain User’s Guide
4
Setting Up Serial Networking
The B3000-B brain can be connected to a
SNAP PAC S-series or mistic controller, or to
a PC equipped with an Opto 22 PCI-AC48
adapter card, which provides an
RS-485 port.
Follow these steps to set up serial
networking:
1. Attach an RS-485 serial cable to the
serial port. (See Chapter 3: Wiring for
cable recommendations).
2. Follow the wiring diagrams beginning
on page 12 for the serial network.
3. Rotate the baud rate switch to set the
desired baud rate, as follows:
NOTE: Due to timing tolerances, some baud rates may not work with some compatible devices.
Baud rate
switch
Serial
connector
Termination
switches
Address upper
IRQ LED
Reset switch
TX/RX LED
STAT LED
B3000-B
Pin 1
Address lower
8
9
A
B
C
D
E
F
7
6
5
4
3
2
1
0
Baud Rate Switch
Baud rate Switch
position Baud rate Switch position
(Reserved) F 4800 bps 7
* 230400 bps E 2400 bps 6
115200 bps D 1200 bps 5
76800 bps C 600 bps 4
57600 bps B 300 bps 3
38400 bps A (Reserved) 2
19200 bps 9 (Reserved) 1
9600 bps 8 (Reserved) 0
* Older Opto 22 controllers do not support this setting. It
is supported by SNAP PAC S1’s and S2’s.

CHAPTER 2: CONFIGURATION AND COMMUNICATION
B3000-B Serial Brain User’s Guide
5
5
4. Use the three termination switches to set termination as follows:
– For all B3000-B units that are not at the physical end of the cable, set
all three of the termination switches to the OFF position.
– For the B3000-B at the physical end of the cable, set as follows:
– If using 2-wire RS-485, set IRQ and TX/RX ON, and set RX OFF.
– If using 4-wire RS-485, set all three of the termination switches
ON.
NOTE: If your system has a controller or computer at one end of the cable, you
only need to terminate the one B3000-B at the other end of the cable.
However, if you have B3000-B units at both ends of the cable with the
controller or computer somewhere in-between, you need to terminate the
B3000-B units at both ends of the cable and turn off the termination at the
controller or computer.
NOTE: Biasing is required at one location only. It can be applied anywhere on
the link, however, it is normally applied at the controller or computer. Because
of this, the B3000-B does not offer biasing switches.
5. Use the two rotary address switches to set the unit’s address as described
in the next section.
Setting the Address and Communication Options
The brain’s address and other communication options are set
using the two 16-position rotary switches on the top of the
brain—an upper address switch and a lower address switch.
Each B3000-B contains four addresses consisting of the base
address, base +1, base +2, and base +3. The base address is
an even multiple of 4.
NOTE: The normal communication options are Binary and CRC.
The following tables show switch settings for each address.
•For Binary or ASCII, CRC16, see page 6
•For Binary or ASCII, Checksum, see page 7
ON
End of cable:
4-wire RS-485
ON
End of cable:
2-wire RS-485
ON
123
IRQ
RX
TX/RX
Not at end of cable:
switches off
IRQ
RX
TX/RX
IRQ
RX
TX/RX
123
123
Upper
address
Lower
address
8
9
A
B
C
D
E
F
7
6
5
4
3
2
1
0
Address Switch

SETTING THE ADDRESS AND COMMUNICATION OPTIONS
B3000-B Serial Brain User’s Guide
6
Binary Mode with CRC16
This mode is supported by PAC Control and Opto Control.
ASCII Mode with CRC16
This mode is supported by PAC Control and Opto Control.
Base Address 0 4 8 12162024283236404448525660
Upper Address 0000111122223333
Lower Address 048C048C048C048C
Base Address 64 68 72 76 80 84 88 92 96 100 104 108 112 116 120 124
Upper Address 4444555566667777
Lower Address 048C048C048C048C
Base Address 128 132 136 140 144 148 152 156 160 164 168 172 176 180 184 188
Upper Address 88889999AAAABBBB
Lower Address 048C048C048C048C
Base Address 192 196 200 204 208 212 216 220 224 228 232 236 240 244 248 252
Upper Address CCCCDDDDEEE EF F F F
Lower Address 048C048C048C048C
Base Address 0 4 8 12162024283236404448525660
Upper Address 0000111122223333
Lower Address 159D159D159D159D
Base Address 64 68 72 76 80 84 88 92 96 100 104 108 112 116 120 124
Upper Address 4444555566667777
Lower Address 159D159D159D159D
Base Address 128 132 136 140 144 148 152 156 160 164 168 172 176 180 184 188
Upper Address 88889999AAAABBBB
Lower Address 159D159D159D159D
Base Address 192 196 200 204 208 212 216 220 224 228 232 236 240 244 248 252
Upper Address CCCCDDDDEEE EF F F F
Lower Address 159D159D159D159D
Upper address switch
Lower address switch
Upper address switch
Lower address switch

CHAPTER 2: CONFIGURATION AND COMMUNICATION
B3000-B Serial Brain User’s Guide
7
7
Binary Mode with Checksum
This mode is not supported by PAC Control and Opto Control.
ASCII Mode with Checksum
This mode is not supported by PAC Control and Opto Control.
Base Address 0 4 8 12162024283236404448525660
Upper Address 0000111122223333
Lower Address 26AE26AE26AE26AE
Base Address 64 68 72 76 80 84 88 92 96 100 104 108 112 116 120 124
Upper Address 4444555566667777
Lower Address 26AE26AE26AE26AE
Base Address 128 132 136 140 144 148 152 156 160 164 168 172 176 180 184 188
Upper Address 88889999AAAABBBB
Lower Address 26AE26AE26AE26AE
Base Address 192 196 200 204 208 212 216 220 224 228 232 236 240 244 248 252
Upper Address CCCCDDDDEEE EF F F F
Lower Address 26AE26AE26AE26AE
Base Address 0 4 8 12162024283236404448525660
Upper Address 0000111122223333
Lower Address 37BF37BF37BF37BF
Base Address 64 68 72 76 80 84 88 92 96 100 104 108 112 116 120 124
Upper Address 4444555566667777
Lower Address 37BF37BF37BF37BF
Base Address 128 132 136 140 144 148 152 156 160 164 168 172 176 180 184 188
Upper Address 88889999AAAABBBB
Lower Address 37BF37BF37BF37BF
Base Address 192 196 200 204 208 212 216 220 224 228 232 236 240 244 248 252
Upper Address CCCCDDDDEEE EF F F F
Lower Address 37BF37BF37BF37BF
Upper address switch
Lower address switch
Upper address switch
Lower address switch

ADDRESSING I/O
B3000-B Serial Brain User’s Guide
8
Addressing I/O
The B3000-B is connected to a SNAP B-series I/O rack, which can hold either 8, 12, or 16 SNAP
modules. Digital modules (either input or output) contain four channels of I/O. Analog input
modules contain two channels and analog output modules contain one or two channels. Both
analog and digital modules can be on the same rack.
NOTE: Some SNAP modules cannot be used with the B3000-B. For example, analog modules with four or
more points cannot be used; high-density digital modules cannot be used. Also, some newer modules
require different processing and cannot be used with the B3000-B. Consult the module’s data sheet for
compatibility information.
A B3000-B is capable of addressing a maximum of 32 channels of digital I/O and 32 channels of
analog I/O. However, the I/O mounting racks will not accommodate 32 channels of both digital and
analog. The actual number of channels available depends on the combination of modules you
choose. For example, the SNAP-B16M rack can mount 16 modules. Up to eight of these modules can
be digital, providing 32 channels of digital I/O. The remaining eight module positions can be analog,
providing up to 16 channels of analog I/O. However, if all 16 modules are analog (no digital modules
at all), up to 32 channels of analog I/O are available.
I/O on the B3000-B is divided into four addresses (two digital I/O and two analog I/O). The digital
addresses are base+0 and base+1. The analog addresses are base+2 and base+3. Therefore, if the
brain is configured at address 12, the digital addresses would be 12 and 13 and the analog would be
14 and 15. See the following page for an illustration of the rack with digital and analog modules,
showing their addresses.
First Four Module Positions (0-3)—As you see in the illustration on the following page, each of
the first four module positions on the rack can hold either a digital or an analog module. These first
four positions can be all analog, all digital, or any mix of both.
These four positions constitute the 16 digital channels of digital address base+0, and the first eight
analog channels of analog address base+2.
Second Four Module Positions (4-7)—Like the first four module positions, each position in the
second group of four can hold either a digital or an analog module. They can be all analog, all digital
or any mix of both.
These four positions constitute the 16 digital channels of digital address base+1, or the second eight
analog channels of analog address base+2.
Last Eight Module Positions (8-15)—These positions hold analog modules only. These eight
positions constitute the 16 analog channels of analog address base+3.

CHAPTER 2: CONFIGURATION AND COMMUNICATION
B3000-B Serial Brain User’s Guide
9
9
Digital and Analog I/O Addressing
See explanation on the previous page.

ADDRESSING I/O
B3000-B Serial Brain User’s Guide
10

B3000-B Serial Brain User’s Guide 11
11
3: 3: WiringChapter 3
3: Wiring
See the section below for communication cables recommended for use with the B3000-B. See
page 12 for wiring diagrams that show how to connect a B3000-B brain to a SNAP PAC S-series
controller.
Communication Cables
The following cables are recommended for RS-485/422 serial communications. Although you may
elect to use other cables, keep in mind that low capacitance (less than 15 pF/ft.) is important for
high-speed digital communication links. The cables listed below are all 24-gauge, 7x32 stranded,
with 100-ohm nominal impedance and a capacitance of 12.5 pF/ft.
Select from the following two-, three-, and four-pair cables, depending on your application needs.
All will yield satisfactory results. It is recommended that you choose a cable with one more pair than
your application requires. Use one of the extra wires, rather than the shield, for the common.
See belden.com and www.manhattanwire.com.
Two-Pair:
Belden P/N 8102 (with overall shield)
Belden P/N 9729 (individually shielded)
Belden P/N 8162 (individually shielded with overall shield)
Manhattan P/N M3475 (individually shielded with overall shield)
Three-Pair:
Belden P/N 8103 (with overall shield)
Belden P/N 9730 (individually shielded)
Belden P/N 8163 (individually shielded with overall shield)
Manhattan P/N M3476 (individually shielded with overall shield)
Four-Pair:
Belden P/N 8104 (with overall shield)
Belden P/N 9728 (individually shielded)
Belden P/N 8164 (individually shielded with overall shield)
Manhattan P/N M3477 (individually shielded with overall shield)

WIRING DIAGRAMS
B3000-B Serial Brain User’s Guide
12
Wiring Diagrams
Wiring to a SNAP-PAC-S1 Controller
NOTE: The SNAP-PAC-S1 controller only supports 2-wire RS-485.
Two-wire
Two-wire with interrupt line
TX/RX +
TX/RX –
COM
Pin 1 TX/RX +
TX/RX –
COM
Termination switches, end of cable
IRQ and TX/RX ON; RX OFF
Middle of cable
All switches OFF
Earth GND
123
ON 123
ON
Both switches ON
TX/RX +
TX/RX –
COM
Pin 1
TX/RX +
TX/RX –
COM
Earth GND
IRQ +
IRQ –
IRQ +
IRQ –
TX/RX +
TX/RX –
COM
IRQ +
IRQ –
Middle of cable
All switches OFF
123
ON
123
ON
Termination switches, end of cable
IRQ and TX/RX ON; RX OFF
Both switches ON
Termination switches, end of cable
IRQ and TX/RX ON; RX OFF

CHAPTER 3: WIRING
B3000-B Serial Brain User’s Guide
13
13
Wiring to a SNAP-PAC-S2 Controller
NOTE: The SNAP-PAC-S2 supports both two-wire and four-wire RS-485. Use PAC Manager to configure the
serial ports. For details, see form 1704, the PAC Manager User’s Guide.
Two-wire
Two-wire with interrupt line
Pin 1
Earth GND
TX/RX +
TX/RX –
COM
TX/RX +
TX/RX –
COM
TX/RX +
TX/RX –
COM
Middle of cable
All switches OFF
123
ON 123
ON
Termination switches, end of cable
IRQ and TX/RX ON; RX OFF
Configure serial port as
2-wire 485 with
termination and bias
Pin 1
Earth GND
TX/RX +
TX/RX –
COM
TX/RX +
TX/RX –
COM
TX/RX +
TX/RX –
COM
Middle of cable
All switches OFF
123
ON 123
ON
Termination switches, end of cable
IRQ and TX/RX ON; RX OFF
IRQ +
IRQ –
IRQ +
IRQ –
Configure serial port
as 2-wire 485 with
termination and bias

WIRING DIAGRAMS
B3000-B Serial Brain User’s Guide
14
Wiring to a SNAP-PAC-S2 Controller (continued)
Four-wire
Four-wire with interrupt line
RX +
RX –
COM
TX/RX –
TX/RX +
Earth GND
TX/RX +
TX/RX –
COM
RX –
RX +
TX/RX +
TX/RX -
COM
RX -
RX +
Middle of cable
All switches OFF
123
ON
123
ON
Termination switches, end of cable
All switches ON
4
5
3
1
2
NOTE: The connector pins
on an actual SNAP-PAC-S2
are in a different order than
shown here.
Configure serial port as
4-wire 485 with
termination and bias
TX/RX +
TX/RX -
COM
RX -
RX +
TX/RX +
TX/RX -
COM
RX -
RX +
Middle of cable
All switches OFF
123
ON
123
ON
Termination switches, end of cable
All switches ON
IRQ +
IRQ –
RX +
RX –
COM
TX/RX –
TX/RX +
Earth GND
NOTE: The connector pins
on an actual SNAP-PAC-S2
are in a different order than
shown here.
IRQ +
IRQ –
Configure serial port as
4-wire 485 with
termination and bias
4
5
3
1
2
7
8

CHAPTER 3: WIRING
B3000-B Serial Brain User’s Guide
15
15
Wiring to a PCI-AC48 Adapter Card in a PC
NOTE: Check the default termination and bias on the PCI-AC48 and make certain they are set
appropriately for the network. Termination should be at each end of the RS-485 cable, and biasing should
be at one location only, typically at the host device, which would be the PCI-AC48 in this case.
NOTE: For system architecture drawings using a PCI-AC48 adapter card in a PC, see form 787, the B3000
Brain Data Sheet.
Two-wire
Two-wire with interrupt line
TX/RX +
TX/RX –
COM
Pin 1
TX/RX +
TX/RX –
COM
Earth GND
PCI-AC48 adapter card in PC
PortA
Middle of cable
All switches OFF
123
ON 123
ON
Termination switches, end of cable
IRQ and TX/RX ON; RX OFF
TX/RX +
TX/RX –
COM
Pin 1
TX/RX +
TX/RX –
COM
PCI-AC48 adapter card in PC
IRQ +
IRQ –
Earth GND
PortA
IRQ +
IRQ –
Termination switches, end of cable
IRQ and TX/RX ON; RX OFF
Middle of cable
All switches OFF
123
ON 123
ON

WIRING DIAGRAMS
B3000-B Serial Brain User’s Guide
16
Wiring to a PCI-AC48 Adapter Card in a PC (continued)
Four-wire
Four-wire with interrupt line
TX/RX +
TX/RX –
COM
RX +
RX –
TX/RX +
TX/RX –
COM
RX +
RX –
Earth GND
PCI-AC48 adapter card in PC
PortB
PortA
Termination switches, end of cable
All switches ON
Middle of cable
All switches OFF
123
ON 123
ON
NOTE: An actual PCI-AC48 card
connector has 10 pins, and the
pins are in a different order
than shown here.
COM
TX +
TX –
RX +
RX –
2
1
2
1
3
TX/RX +
TX/RX –
COM
RX +
RX –
IRQ +
IRQ –
TX/RX +
TX/RX –
COM
RX +
RX –
IRQ +
IRQ –
Earth GND
PCI-AC48 adapter card in PC
PortB
PortA
Termination switches, end of cable
All switches ON
Middle of cable
All switches OFF
123
ON
123
ON
NOTE: An actual PCI-AC48 card
connector has 10 pins, and the
pins are in a different order
than shown here.
COM
TX –
IRQ –
IRQ +
RX +
RX –
TX –
IRQ +
TX +
2
1
3
2
1
5
4