Digi Digi One EM Application guide

DigiConnectEM &
Digi Connect Wi‐EM
HardwareReference
TM
TM
90000632_G
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© Digi International Inc. 2006. All Rights Reserved.
The Digi logo is a registered trademark of Digi International, Inc.
Connectware and Digi Connect EM and Digi Connect Wi-EM are trademarks of Digi International, Inc.
NetSilicon, NET+Works, NET+OS, and NET+ are trademarks of NetSilicon, Inc.
All other trademarks mentioned in this document are the property of their respective owners.
Information in this document is subject to change without notice and does not represent a commitment on the part of Digi
International.
Digi provides this document “as is,” without warranty of any kind, either expressed or implied, including, but not limited to,
the implied warranties of fitness or merchantability for a particular purpose. Digi may make improvements and/or changes
in this manual or in the product(s) and/or the program(s) described in this manual at any time.
This product could include technical inaccuracies or typographical errors. Changes are periodically made to the information
herein; these changes may be incorporated in new editions of the publication.
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 5
Contents
About This Guide ..................................................................................................................... 7
Scope of Reference Manual ............................................................................................. 7
Kits Contents .................................................................................................................... 7
Related Documentation .................................................................................................... 9
Support Information ......................................................................................................... 9
Chapter 1: About the Embedded Module.......................................................................... 11
Overview ........................................................................................................................11
Types of Modules........................................................................................................... 12
Connectors: Power and Serial Interface ......................................................................... 15
Connectors: Ethernet Interface....................................................................................... 16
Connectors: Antenna ...................................................................................................... 17
Reset Switch ................................................................................................................... 18
Module LEDs ................................................................................................................. 18
Chapter 2: About the Development Board ........................................................................ 23
Overview ........................................................................................................................23
Basic Description ........................................................................................................... 23
Ports................................................................................................................................ 25
Connectors and Blocks................................................................................................... 27
Power Jack (P17)............................................................................................................ 31
Switches.......................................................................................................................... 32
Development Board LEDs ............................................................................................. 34
Test Points ...................................................................................................................... 36
Chapter 3: Programming Considerations.......................................................................... 39
GPIO............................................................................................................................... 39
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6
Embedded Module LEDs............................................................................................... 43
Embedded Module Reset ............................................................................................... 44
Flash ............................................................................................................................... 45
Appendix A: Specifications ................................................................................................. 47
Network Interfaces......................................................................................................... 47
Serial Interface ............................................................................................................... 48
Data Rates (bps) ............................................................................................................. 48
Flow Control Options..................................................................................................... 48
Environmental................................................................................................................ 48
DC Characteristics ......................................................................................................... 48
Mechanical .................................................................................................................... 50
Layouts and Dimensions ................................................................................................ 51
Recommended PCB Layouts ......................................................................................... 63
Antenna Information ...................................................................................................... 68
RF Exposure Statement.................................................................................................. 74
Safety Statements ........................................................................................................... 74
Appendix B: Certifications ................................................................................................. 77
FCC Part 15 Class B ...................................................................................................... 77
Industry Canada ............................................................................................................. 78
Declaration of Conformity ............................................................................................. 79
International EMC Standards......................................................................................... 80
Appendix C: Sample Application: TTL Signals to EIA-232............................................ 81
Revision G......................................................................................................................83
Revision F ......................................................................................................................83
Revision E ......................................................................................................................83
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 7
••••••••••••••••••••••••••••••••••••••••••••••••••
•
About This Guide
Scope of Reference Manual
The scope of this guide is to enable developers to integrate the Digi Connect EM
or Digi Connect Wi-EM modules into other devices. Graphics illustrate the
placement and dimensions of components for both the modules and the
development board. Information for both the Digi Connect EM and the Digi
Connect Wi-EM are identical unless called out specifically in the manual.
Kits Contents
This manual is intended for customers who use either the Digi Connect EM/Digi
Connect Wi-EM Integration Kit or the Digi Connect EM/Digi Connect Wi-EM
Development Kit, which are described below.
About the Integration Kit
The integration kit is the ideal platform for product evaluation, rapid prototyping,
and integration of the Digi Connect EM or Digi Connect Wi-EM embedded device
server. Targeted specifically at customers who want to take advantage of the Digi
Connect EM or Digi Connect Wi-EM embedded device server with Digi plug-and-
play firmware functionality, both products enable integration of the Digi Connect
EM or Digi Connect Wi-EM embedded module without any extensive embedded
software development with all the additional flexibility and benefits of web user
interface customization and application specific java applets. Included in the Digi
Connect EM or Digi Connect Wi-EM Integration Kits are the following:
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Kits Contents
8  Digi Connect EM & Wi-EM Hardware Reference
Complete development board with EIA-232 serial ports, signal status
indicators, logic analyzer connectors, test points, and a self-contained
GPIO test bed.
Cables
– DB-9 to DB-9 Crossover cable
– DB-9 to DB-9 Modem cable
–RJ-45EthernetCrossover cable
Loopback plug
Power supply
Wrist strap (for grounding)
Digi Connect CD
– sample code
– tools and utilities with source code and libraries
– Microsoft Windows RealPort drivers
Full software and hardware documentation
About the Development Kit
The Digi Connect EM or Digi Connect Wi-EM Development Kit is an easy-to-use
and royalty-free development platform that significantly reduces traditional design
risk and accelerates the overall software development process. Both kits deliver
the integrated building blocks to quickly and cost effectively create your own
custom firmware for a Digi Connect EM or Digi Connect Wi-EM based high-
performance networking solution that fits the specific requirements of your
application.
Based on the NET+Works family of platform solutions, the Digi Connect EM or
Digi Connect Wi-EM development kits enable you to integrate custom network
connectivity into your products quickly by providing a full suite of development
tools inlcuding:
Development board
Cables
Power supply
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 9
Hardware debugger
Complete set of networking protocols and applications software
Related Documentation
See the NS 7520 Hardware Reference for information on the NS 7520 chip.
Support Information
To get help with a question or technical problem or make comments and
recommendations about Digi products and documentation, use the following
contact information.
General Customer Service and Support
Digi International
11001 Bren Road East
Minnetonka, MN 55343
U.S.A.
United States: 1 877-912-3444
Other Locations: 1 952-912-3444
www.digi.com/support
www.digi.com
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Support Information
10  Digi Connect EM & Wi-EM Hardware Reference
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 11
About the Embedded
Module
CHAPTER 1
Overview
Digi Connect EM and Digi Connect Wi-EM Overview
The embedded modules are part of the Digi Connect family of device servers that provide
simple, reliable and cost-effective network connections for serial devices. They provide
fully transparent serial device connectivity over industry-standard Ethernet connections
and allow both equipment manufacturers and systems integrators to network-enable
products at a fraction of the time and cost required to develop a custom solution. It is a
highly flexible and compact single component solution with a robust on-board TCP/IP
stack and 10/100 Base-T Ethernet or wireless support. Features include the following:
32-bit NS7520 processor with ARM7TDMI core
4MB Flash and 8MB RAM on board
2 High Speed Serial Ports
SPI Master Mode Interface
9 General Purpose Input/Output Port Options
Available with Digi plug-and-play firmware
NetSilicon NET+Works platform for embedded software development
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Types of Modules
12  Digi Connect EM & Digi Connect Wi-EM Hardware Reference
From medical systems to building control and industrial automation, in virtually any
application where embedded serial connectivity over Ethernet is needed, the embedded
module is the ideal choice, delivering high-performance functionality.
Cautions
To guard against damage to the module due to electrostatic discharge (ESD), do not remove
it from its protective packaging until you have been properly grounded. To ground yourself,
put the wrist strap on (included in the package) and then attach the clip to a metal surface.
Input voltage for the module is 3.3 VDC.
Types of Modules
The following describes the three types of Digi Connect EM and three types of Digi
Connect Wi-EM modules:
Choosing a Module for Your Product
Although any of the embedded modules can be designed into your product, a JTAG header
would typically be used only for debugging during the development process. The Digi
Connect EM module part number DC-EM-02T-S or DC-EM-02T-C is appropriate when its
integrated LEDs and RJ-45 Ethernet connectors are accessible and visible to the end-users
of your product. The Digi Connect EM module part number DC-EM-02T-NC or DC-EM-02T-
JT is the right choice when you want more control over RJ-45 Ethernet connector and LED
locations or when you will provide custom connectors or indicators.
The Digi Connect Wi-EM module part number DC-WEM-02T-C or DC-WEM-02T-S is
appropriate when its integrated LEDs are accessible and visible to the end-users of your
product. The Digi Connect Wi-EM module part number DC-WEM-02T-JT or DC-WEM-02T-
NC is the right choice when you want more control over LED locations or when you will
provide custom connectors or indicators.
Please refer to the Digi website www.digi.com for part number and ordering information
for the modules
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 13
About the Embedded Module
DC-EM-02T-ST.C
Digi Connect EM Modules
Model Description Figure
DC-EM-02T-JT
--- Used for development
purposes only
--- JTAG interface
--- Pin headers for Ethernet and
LED functionality.
DC-EM-02T-NC
--- No JTAG interface
--- Pin headers for Ethernet and
LED functionality
--- Ordered independently of
development kit for use in
your implementation
DC-EM-02T-S
DC-EM-02T-C
--- No JTAG interface
--- RJ-45 Ethernet connector and
LED array
--- Ordered independently of
either the development or
integration kit for use in your
implementation.
Digi Connect Wi-EM Modules
Model Description Figure
DC-WEM-02T-JT
--- Used for development purposes
only
--- JTAG interface
--- Pin headers LED functionality
--- Dual RP-SMA Antenna Connector.
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Types of Modules
14  Digi Connect EM & Digi Connect Wi-EM Hardware Reference
Note -S: No JTAG, w/ LED array, w/RJ-45/antenna connectors, for use with Digi
Firmware
-C: No JTAG, w/LED array, RJ-45 / antenna connectors, for use with Custom
Firmware
-NC: No JTAG, w/LED pin header, w/o RJ-45 connector (for Digi Connect
EM), w/antenna connectors (for Digi Connect Wi-EM), for use with custom
firmware (not shown)
-JT: w/ JTAG, w/pin header, w/o RJ-45 connector (for Digi Connect EM), w/
antenna connectors (for Digi Connect Wi-EM), for use with custom firmware
development
Digi Connect Wi-EM Antennae
The Digi Connect Wi-EM is available with dual-diversity antenna connectors. The right
antenna (P2) is always used for transmit and receive.The left antenna is receive only. The
antenna will choose the best signal (pin vs. socket). The Digi Connect Wi-EM always has
two antenna connectors but using the second antenna is optional.
The antennae are connected to the module with reverse polarity SMA connectors (sub-
miniature size A). The antennae fit the connectors on the module only one way to ensure a
DC-WEM-02T-NC
--- No JTAG interface
--- Pin headers LED functionality
--- Dual RP-SMA Antenna Connector
--- Ordered independently of
development kit for use in your
implementation
DC-WEM-02T-C
DC-WEM-02T-S
--- No JTAG interface
--- LED array
--- Dual RP-SMA Antenna Connector
--- Ordered independently of either
development or integration kit for
use in your implementation.
Digi Connect Wi-EM Modules
Model Description Figure
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 15
About the Embedded Module
proper connection. The antennae function best when placed perpendicular to each other
(one straight, the other up or down) to prevent interference from each other.
Another option for both signal reception and design flexibility is to use an antenna
extension cord (Digi part number DC-ANT-E-24DP) to separate the antenna from the
module. This allows the module to fit inside your product but the antenna to be placed
outside the device.
Connectors: Power and Serial Interface
This single 12-pin, serial interface port (labeled P4 for Digi Connect EM and P5 for Digi
Connect Wi-EM) supports 2 TTL serial interfaces, data rates up to 230 Kbps and full-
modem control (on port 1). See the figure for help locating pins and the table for pin
assignments.
Power and Serial Interface
pin 1
2
3
4
5
6
7
8
9
10
1112
GRN GRN
RED YEL
PIN1
PIN1
Top view
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Connectors: Ethernet Interface
16  Digi Connect EM & Digi Connect Wi-EM Hardware Reference
Connectors: Ethernet Interface
The following table shows the pinout of the RJ-45 connector..
For a diagram of the Digi Connect Ethernet pin header location and assignments see "Digi
Connect EM Pin Header Locations (Top view)" on page 20.
Power and Serial Interface Pin Assignments
Pin Signal Name Description and Notes
1 VCC +3.3 VDC (input only)
2 GND Reference Ground for input power
3 RXD/GPIO-7 Port 1 RXD (input)/GPIO-7
4 TXD/GPIO-6 Port 1 TXD (output)/GPIO-6
5 RTS/GPIO-4/SPI_CLK Port 1 RTS/GPIO-4/SPI clock
6 DTR/GPIO-5 Port 1 DTR (output)/GPIO-5
7 CTS/GPIO-2 Port 1 CTS (input)/GPIO-2
8 DCD/GPIO-1/SPI_EN Port 1 DCD (input)/GPIO-1/SPI enable
9 DSR/GPIO-3 Port 1 DSR (input)/GPIO-3
10 /RST Reset (input)
11 RXD/GPIO-9 Port 2 RXD (input)/GPIO-9
12 TXD/GPIO-8 Port 2 TXD (output)/GPIO-8
RJ-45 Ethernet Interface
Pin # 12345678
Signal
TXD+
(Transmit
Data)
TXD-
(Transmit
Data)
RXD+
(Receive
Data)
Not used Not used
RXD-
(Receive
Data)
Not used Not used
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 17
About the Embedded Module
Connectors: Antenna
The Digi Connect Wi-EM has 2 RP-SMA antenna connectors labeled P2 and P3.
Wi-EM Antenna Connectors
The antenna is connected to the module with a reverse polarity SMA connector (sub-
miniature size A). The antenna only fits on the module one way to ensure a proper
connection. Another option for both signal reception and design flexibility is to use an
antenna extension cord (Digi part number DC-ANT-E-24DP) to separate the antenna from
the module. This allows the module to fit inside your product but the antenna to be placed
outside the device.
Antenna Description
Type Desktop Dipole 30 cm
Antenna Extension Cord
Part number DC-ANT-24DT DC-ANT-24DP DC-ANT-E-24DP
Gain 1.8 dBi 2 dBi -.5dB
Caution: This Part 15 radio device operates on a non-interference basis
with other devices operating at this frequency when using the antennae
listed in the Antenna Specification table. Any changes or modification to
user’s authority to operate the device.
the product not expressly approved by Digi International could void the
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Reset Switch
18  Digi Connect EM & Digi Connect Wi-EM Hardware Reference
Reset Switch
The behavior of the reset switch is determined by software, which means that it has a
predefined behavior in the integration kit. In the development kit, its behavior is
determined by your implementation. See the following table for details.
Reset Switch Location
Note The reset switch is in same location for both wired and wireless modules.
Module LEDs
The modules provide two hardware options for LEDs, with or without on board LED array.
The integration kit provides predefined LED behavior. With the development kit, some
Reset Switch Behavior
Kit Behavior
Integration The reset switch does one of the following:
 If pressed and released immediately, the device is rebooted.
 If pressed and held down (for about 20 seconds) during power-up, the
device is rebooted and restored to the default configuration.
Development  The behavior of the switch is user-defined.
See "Embedded Module Reset" on page 44 for more information.
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 19
About the Embedded Module
LED behavior can be determined by your implementation. See the following table for more
information..
LED Behaviors
LED Pin
Header
EM
Integration Kit
Digi Connect EM
Integration Kit
Digi Connect Wi-EM
Development
Kit
Top left
(green)
1 (+)
3(-)
Serial port activity:
Off - the serial channel is idle.
Blinking - serial data is transmitted or received.
This LED is
software
programmable
Top
right
(green)
5 (+)
7 (-)
Network link status:
Off - no link has been detected.
On - a link has been detected.
Network link status:
On - unit is associated with an access point
Blinking slowly - unit is in ad hoc mode
Blinking quickly - unit is scanning for a
network
Same as
Integration Kit
(Network link
status)
Bottom
left (red)
2 (+)
4 (-)
Diagnostics:
Blinking 1-1-1 - starting the operating system.
Blinking 1-5-1 - configuration has been returned to factory defaults.
Note: If other blinking patterns occur, contact Digi Technical Support.
This LED is
software
programmable
Bottom
right
(yellow)
6 (+)
8 (-) Blinking - network data is transmitted or received
This LED is
software
programmable
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Module LEDs
20  Digi Connect EM & Digi Connect Wi-EM Hardware Reference
Digi Connect EM Pin Header Locations (Top view)
Ethernet pin header, P13
The pins in the Ethernet header are configured as shown:
Led pin header
LED pins and pin header configuration are described in the "LED Behaviors" table on
page 19.
4
1
1
2
5
6
3
4
7
8
2
3
pin 12
pin 1
Ethernet
pin heade
r
LED
pin header
Pin Signal
1 Ethernet transmit +
2 Ethernet transmit -
3 Ethernet receive +
4 Ethernet receive -
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