Digi Connect ME Application guide

Digi Connect ME
Hardware Reference

 Digi International Inc. 2003. All Rights Reserved.
The Digi logo is a registered trademark of Digi International,
Inc.
Connectware and Digi Connect ME 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.

n n n n n n n iii
Contents
About This Document ................................................................................................................v
Chapter 1: About the Digi Connect ME Module................................................................1
Overview..........................................................................................................................1
Types of modules .............................................................................................................2
Dimensions.......................................................................................................................3
Recommended PCB layout ..............................................................................................4
Connectors: power and device interface ..........................................................................5
Connectors: Ethernet interface.........................................................................................7
LEDs.................................................................................................................................8
Chapter 2: About the Development Board .........................................................................9
Overview..........................................................................................................................9
Basic description ............................................................................................................10
Port descriptions.............................................................................................................12
Connectors and blocks....................................................................................................16
Switches..........................................................................................................................21
LEDs...............................................................................................................................23
Power jack......................................................................................................................26
Test points ......................................................................................................................27

iv n n n n n n n
Chapter 3: Programming Considerations ........................................................................ 29
Overview........................................................................................................................29
GPIO .............................................................................................................................. 30
LEDs .............................................................................................................................. 32
Reset............................................................................................................................... 33
Flash............................................................................................................................... 34
Memory..........................................................................................................................34
Appendix A Module Specifications....................................................................................35
Mechanical..................................................................................................................... 35
Environmental................................................................................................................ 35
Network interface........................................................................................................... 36
Serial interface ............................................................................................................... 36
Data rates (bps) .............................................................................................................. 36
Flow control options ...................................................................................................... 36
GPIO .............................................................................................................................. 37
DC characteristics .......................................................................................................... 37
Appendix B Certifications.................................................................................................. 39
FCC Part 15 Class B ...................................................................................................... 39
Industry Canada ............................................................................................................. 40
Declaration of Conformity............................................................................................. 41
International EMC standards ......................................................................................... 42
Safety standards ............................................................................................................. 42

n n n n n n n v
•••••••••••••••••••••••••••••••••••••••••••••••••••••••
•
About This Document
Objective
The purpose of this document is to enable developers to integrate the Digi Connect ME
embedded module with other devices, enabling these devices to make use of the module’s
rich networking features.
Audience
This document is written for hard- and software developers who are responsible for
designing networked devices.

vi n n n n n n n Digi Connect ME Hardware Reference

n n n n n n n 1
About the Digi Connect ME
Module
CHAPTER 1
Overview
The Digi Connect ME embedded module provides fully transparent device connectivity
over industry-standard Ethernet connections and allows 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 serial port, GPIO ports, and a robust on-board TCP/IP stack and 10/100 BASE-T
Ethernet support.
From medical systems to building control and industrial automation, in virtually any
application where embedded device connectivity over Ethernet is needed, the Digi Connect
ME embedded module is the ideal choice, delivering high-performance functionality.
This chapter provides information about the module hardware and contains the following
topics:
!"Types of modules" on page 2
!"Dimensions" on page 3
!"Recommended PCB layout" on page 4
!"Connectors: power and device interface" on page 5
!"Connectors: Ethernet interface" on page 7
!"LEDs" on page 8

Types of modules
2n n n n n n n
Types of modules
The type of module that you will use for hardware integration depends on the kit you are
using. If you are using an integration kit, you will be using a module without a JTAG
interface. If you are using a development kit, you will be using a module with a JTAG
interface.
Note JTAG is a commonly used term that is also referred to as IEEE 1149.1, an
industry standard test protocol. JTAG is an abbreviation for the
European Joint Test Action Group, which invented the first versions of
the IEEE 1149.1 interface. The JTAG interface, along with the other
development tools, enables you to download, run and debug programs
on the module.
The following figures show the two types of modules.
Module without JTAG Interface
Module with JTAG Interface
00000018
00000017
JTAG interface

n n n n n n n 3
About the Digi Connect ME Module
Dimensions
The following figures show the dimensions of Digi Connect ME embedded module.
Dimensions: Front View
Dimensions: Bottom View
TOLERANCES:
in [mm]
.010 [,254]
LED LED
.750
[19,05]
.070
[1,778]
.720
[18,288]
.715
18,16[]
.050
1,27[]
00000026
PIN 1
.050
1,27[]
.050
1,27[]
.450
11,43[]
.360
9,14[]
.440
11,18[]
0
0000027
TOLERANCES:
in [mm]
.010 [,254]

Recommended PCB layout
4n n n n n n n
Dimensions: Side View
Recommended PCB layout
The following figure shows the recommended PCB (printed circuit board) layout of the
Digi Connect ME embedded module.
Recommended PCB Layout
TOLERANCES:
in [mm]
.010 [,254]
FRONT REAR
.735
18,67[]
.854
21,69[]
1.445
[36,703]
1.216
30,87[]
.715
18,16[]
.804
20,42[]
.351
8,91[]
1.150
29,21[]
.300
[7,62]
00000028
00000023
TOLERANCES:
in [mm]
.010 [,254]
PIN 1
FRONT
SHIELD OUTLINE
.799
[20,295]
.720
[18,288]
.070
[1.778]
.050
[1,27]
.815
[20,701]
.050
[1,27]
Ø .06
[1,524]
Ø .023
[0,5842]
.450
[11,43
]
The 0.060" diameter
holes (x4) must be
plated and
connected to a solid
logic ground plane.

n n n n n n n 5
About the Digi Connect ME Module
Connectors: power and device interface
The module has a 20-pin male connector that supports a serial interface with data rates up
to 230,400 bps and full-modem control, and GPIO ports. See the following figure for pin
orientation and the table for pin assignments.
Note Digi recommends 100 pF capacitors to ground on all inputs and outputs to the
module for ESD immunity. This does not apply to the power pass-thru
pins.
Power and Device Interface Connector
00000019
Pin 2
Pin 19
Pin 1
Pin 20
Module
front
Bottom view

Connectors: power and device interface
6n n n n n n n
Power and Device Interface Connector Pin Assignments
Pin Signal Description Pin Signal Description
1 VETH+ Power Pass-Thru + 11 CTS / GPIO 2 Clear to Send (Input) / GPIO
2 VETH- Power Pass-Thru - 12 DSR / GPIO 3 Data Set Ready (Input) / GPIO
3 — Position Removed 13 DCD / GPIO 1 Data Carrier Detect (Input) / GPIO
4 — Position Removed 14 RESET Reset
5 — Position Removed 15 +3.3V Power
6 — Position Removed 16 GND Ground
7 RXD Receive Data (Input) 17 — Reserved. Do not connect.
8 TXD Transmit Data (Output) 18 — Reserved. Do not connect
9 RTS / GPIO 4 Request to Send (Output) / GPIO 19 — Reserved. Do not connect
10 DTR / GPIO 5
Data Terminal Ready (Output) / GPIO 20 /INIT GPIO--See "Digi Connect ME
GPIO pin use" on page 31 and
"Reset" on page 33.

n n n n n n n 7
About the Digi Connect ME Module
Connectors: Ethernet interface
The Ethernet connector is an 8-wire RJ-45 jack that meets the ISO 8877 requirements for
10/100BASE-T. See the following figure and table for pin orientation and pin assignments.
Note Pin orientation and assignments are the same for modules with or without a
JTAG connector.
Ethernet Interface Pin Orientation
Ethernet Interface Pin Assignments
Pin Signal Description Pin Signal Description
1 TXD+ Transmit Data + 5 EPWR+ Power from Switch +
2 TXD- Transmit Data - 6 RXD- Receive Data -
3 RXD+ Receive Data + 7 EPWR- Power from Switch -
4 EPWR+ Power from Switch + 8 EPWR- Power from Switch -
00000021
Pin 1
Pin 8

LEDs
8n n n n n n n
LEDs
The module has two LEDs that are located near the upper corners of the Ethernet port (see
the following figure). The following table describes the LEDs.
Note The LEDs are the same for a module with or without a JTAG connector.
LED Locations
LED Descriptions
LED Color Description
Network Link (left-upper) Yellow Network Link is operational: On (continuously)
indicates that an Ethernet connection is made.
Network Activity/Diagnostic
(right-upper) Green Network Activity: On when network traffic detected; off when no network traffic detected.
Diagnostic: Flashes three times in even duration
during power up or reset, indicating successful
startup.
00000030
Network Activity/
Diagnostic
Network
Link

n n n n n n n 9
About the Development
Board
CHAPTER 2
Overview
The development board is a hardware platform from which you can determine how to
integrate the Digi Connect ME embedded module into your design. The board consists of
the following main features:
!Socket for connecting the Digi Connect ME embedded module
!JTAG connection (for use with the development kit only)
!GPIO switches
!Serial and GPIO ports
!Power input
This chapter provides information on development board components and contains the
topics listed below. For more detailed information on the development board, see the
schematic and mechanical drawings on the CD that accompanies your integration kit or
development kit. (If you have installed the integration kit or development kit, you can access
the schematic from the Start menu.)
!"Basic description" on page 10
!"Placement of Module" on page 12
!"Connectors and blocks" on page 16
!"Switches" on page 21
!"LEDs" on page 23
!"Power jack" on page 26

Basic description
10 n n n n n n n Digi Connect ME Hardware Reference
!"Test points" on page 27
Note The development board contains some components that are used with other
Digi embedded products and are noted as such in this document.
Basic description
The development board contains connectors, switches, and LEDs for use while integrating
the Digi Connect ME embedded module into your design. See the following figure for the
location of the connectors, switches, and LEDs. Additionally, the board provides test points
(not shown on the figure). For more information about test points, see "Test points" on page
27.
00000005
P
8
P8
P1
1
P11
P4
C
R2
CR2
P
3
P3
C
R1
6
CR16
C
R
6
CR6
C
R1
5
CR15
P6
P6
S
W
2
SW2
P9
P9
S
W
3
SW3
C
R
4
CR4
CR
9
CR9
C
R
5
CR5
C
R
1
CR1
P7
P7
P
2
P2
S
W
1
SW1
P1
P1
C
R
8
CR8
C
R
7
CR7
C
R11
CR11
C
R1
0
CR10
C
R1
3
CR13
C
R1
2
CR12
C
R14
CR14
C
R
3
CR3
C
R17
CR17
1
2
3
4
5
6
7
8
10
11
12
13
14
15
16
P
12
P12
9

n n n n n n n 11
About the Development Board
Basic Description: Connectors, Switches and LEDs
Connectors, Switches and LEDs
Caution When handling the development board, wear a grounding wrist strap to
avoid ESD damage to the board.
For more detailed information on connectors, switches and LEDs, see the following:
!"Port descriptions" on page 12
!"Connectors and blocks" on page 16
!"Switches" on page 21
!"LEDs" on page 23
!"Power jack" on page 26
The development board accepts either of the following modules:
!Module without JTAG connector—for use with an integration kit
#Description #Description
1 Secondary Serial Port, P2 9 Primary Serial Port, P1
2 LEDs, CR1 through CR9 10 GPIO Port, P3
3 GPIO Switch Bank, SW1 11 LEDs, CR10 through CR14
4 GPIO Switch Bank, SW2 12 Digital Signal Monitor Jack, P6
5 JTAG Header, P4 13 LEDs, CR15 and CR16
6 Jumper Block, P12 (Reserved) 14 Reset Switch, SW3
7 Digi Connect ME embedded
module Connector, P7 15 LED, CR17
8 Digi Connect ME embedded
module JTAG Connector, P8 16 Power Jack, P11

Port descriptions
12 n n n n n n n Digi Connect ME Hardware Reference
!Module with JTAG connector—for use with a development kit
See the following figures for placement of either module onto the development board.
Placement of Module
Caution If you handle the module, wear a grounding wrist strap to avoid ESD
damage.
Port descriptions
The development board provides the following ports:
!Primary serial port, P1
!Secondary serial port, P2
!GPIO port, P3
See the figure titled "Basic Description: Connectors, Switches and LEDs" on page 11 for
the location of the ports. The following sections describe the ports.
00000015
Module connector
Development
board
Module with
JTAG connector
Module JTAG
connector