Digi Digi One EM Quick user guide
Hardware Reference Manual
Digi One EM
90000278_B
Digi International Inc. 2002. All Rights Reserved
The Digi logo is a registered trademark of Digi International, Inc.
Connectware and Digi One are trademarks of Digi International, Inc.
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.
Digi One EM Hardware Guide 3
Contents
Chapter 1 Introduction 5
About This Guide.............................................................................5
Introducing the Digi One EM..........................................................6
Support Information.........................................................................7
Chapter 2 About the Digi One EM 8
Digi One EM Drawing.....................................................................8
Connectors: Power and Serial Interface (P4)...................................9
Connectors: Ethernet Interface (P1) ..............................................10
Reset Switch ..................................................................................11
LEDs..............................................................................................11
Chapter 3 About the Development Board 13
Overview........................................................................................13
Cautions .........................................................................................13
Development Board Illustration.....................................................14
DB-9 Serial Interface (P1).............................................................15
Reset Switch (SW1).......................................................................16
Power Jack (P7) .............................................................................17
LEDs (CR4 - CR11) .....................................................................18
4Digi One EM Hardware Guide
Chapter 4 Sample Application: TTL Signals to EIA-232 19
Appendix A Digi One EM Specifications 20
Network Interfaces.........................................................................20
Serial Interface...............................................................................20
Data Rates (bps).............................................................................20
Modem Control..............................................................................20
Flow Control Options ....................................................................20
Environmental................................................................................20
Power Requirements......................................................................20
Mechanical.....................................................................................20
Appendix B Digi One EM Certifications 21
FCC Part 15 Class A......................................................................21
ICES 003 Class A..........................................................................22
Product Safety................................................................................22
Digi One EM Hardware Reference 5
Chapter 1
Introduction
About This Guide
Purpose The purpose of this guide is to enable developers to integrate
the Digi One EM into other devices, enabling these devices to
make use of the Digi One EM’s rich networking features.
Audience This document is written for developers tasked with
integrating Digi One EM device servers into other devices.
Scope This document provides the information required for electrical
integration of the Digi One EM into another device. It does
not address how to configure or administer the device server
or how to write applications to use its functionality. These
topics are covered in other documents in the library.
6Digi One EM Hardware Reference
Introducing the Digi One EM
Product Overview
The Digi One EM is part of the Digi One Family of single port
device servers that provide simple, reliable and cost-effective
network connections for serial devices. The Digi One EM
provides fully transparent serial 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 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
serial connectivity over Ethernet is needed, the Digi One EM
is the ideal choice, delivering high-performance functionality.
Cautions • To guard against damage to the Digi One EM due to elec-
trostatic discharge (ESD), do not remove it from its pro-
tective 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 Digi One EM must be in the range of
5VDC to 9VDC.
Digi One EM Hardware Reference 7
Support Information
To get help with a question or technical problem or to make
comments and recommendations about our products or
documentation, use the following contact information.
General Digi International
11001 Bren Road East
Minnetonka, MN 55343
U.S.A
www.digi.com
Customer Service and Support
United States: 1 877-912-3444
Other Locations: 1 952-912-3444
www.support.digi.com
8Digi One EM Hardware Reference
Chapter 2
About the Digi One EM
Digi One EM Drawing
The following figure shows the Digi One EM layout and
dimensions.
Digi One EM Hardware Reference 9
Connectors: Power and Serial Interface (P4)
The Digi One EM has a single 12-pin, serial interface port
(labeled P4) that supports EIA-232 (TTL levels only), data
rates up to 230 Kbps and full-modem control. The following
figure helps you locate pins, and the table helps you identify
which signal uses each pin.
Pin Signal Name Description
1+5VDC to
+9VDC (input
only) Input power to Digi One EM
2 GND Reference Ground for input power
3 RxD Receive Data (input)
4 TxD Transmit Data (output)
5 RTS Request To Send
6 DTR Data Terminal Ready
7 CTS Clear To Send
8 DCD Data Carrier Detect
9 DSR Data Set Ready
10 RST~ Reset
11 Reserved Not used
12 Reserved Not used
10 Digi One EM Hardware Reference
Connectors: Ethernet Interface (P1)
The Digi One EM Ethernet connector is an eight-wire, RJ-45
jack meeting the requirements of ISO 8877 for 10/100Base-
T. The following figure helps you locate pins and the table
helps you identify which signal uses each pin.
Pin Signal Name
1 TxD+ (Transmit Data)
2 TxD- (Transmit Data)
3 RxD+ (Receive Data)
4 Not used
5 Not used
6 RxD- (Receive Data)
7 Not used
8 Not used
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