Digi AccelePort Xr 920 EIA-232 Manual

91000736 A
RJ-45 Pin Assignment
Refer to the CD-ROM for more detailed cabling information.
What Next?
At this point the hardware installation for your AccelePort Xr 920 host
adapter is complete. However, since the adapter must have software
downloaded to its RAM before it becomes functional, you must next
install the software drivers for your operating system.
• Read the instruction booklet for the CD-ROM that came with your
adapter for instructions on installing software.
• View the on-line documentation on the CD-ROM for more informa-
tion about AccelePort products. The Digi logo and AccelePort are registered trademarks of Digi International. Xr 920,
4r 920, and 8r 920 are trademarks of Digi International.
All other brand and product names are trademarks of their respective holders.
© Digi International Inc., 1998
All Rights Reserved
http://www.dgii.com
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. Changesare peri-
odically made to the information herein; these changes may be incorporated in new editions
of the publication.
AccelePort Xr 920 Family:
4r 920 and 8r 920
ISA Host Adapters
EIA-232
Hardware
Installation Guide
Introduction
An AccelePort®Xr 920™host adapter easily expands the number of
EIA-232 ports available on your computer, allowing you to cable addi-
tional peripheral devices, such as modems, terminals or serial printers,
directly to your computer.
As shown in the figure below, an Xr 920 host adapter has one connector
to which a special Digi connector assembly is attached to provide the
peripheral port connections. There are three different connector assembly
options available from Digi to use with an Xr 920 host adapter: an RJ-45
Connector Box, a DB-25 Connector Box, or a DB-25 Cable Assembly.
Figure 17. Example 4r 920 host adapter with connector assemblies
This installation guide describes how to plan your setup and install
AccelePort Xr 920 host adapter hardware.
Signal Description Pin
RI Ring Indicator 1
DSR Data Set Ready 2 †
RTS Request To Send 3
GND Chassis Ground 4
TxD Transmitted Data 5
RxD Received Data 6
SG Signal Ground 7
CTS Clear To Send 8
DTR Data Terminal Ready 9
DCD Data Carrier Detect 10
† Pin 2 can be configured for DCD (through Digi
software) if you want to connect using an 8 pin
connector

Step One: Plan your setup
An AccelePort Xr 920 adapter can be set up in a variety of ways. Before
you start your installation, be sure of the following:
Number of components. You can connect up to four peripherals to an
AccelePort 4r 920 and up to eight peripherals to an AccelePort 8r 920
host adapter.
Location of components. You can locate peripherals a distance from
the adapter, but you must be sure that the cables you use to make the
connection are properly constructed. To achieve the greatest reliabil-
ity over distance, cables should be:
• Shielded, low capacitance, and preferably designed specifically
for serial data transmission.
• Grounded at both ends of the cable.
• Routed away from noise sources such as generators, motors and
fluorescent lights.
Cable Connections. Before beginning the installation, be sure that you
have one of the Digi connector assemblies illustrated in Figure 1. You
will also need a cable for each peripheral that you will be attaching to
the connector assembly. The connector type that you need at either
end of the peripheral cable depends on the type of Digi connector
assembly that you use and the connector on the peripheral.
Digi connector assemblies are available with RJ-45 or DB-25 connec-
tors. You will need to be sure that you have cables of the correct
length and with the right connectors to properly attach the devices
you want to use.
Additional information about the AccelePort 4r 920 and 8r 920, such as
specifications and cabling details, is provided on the CD-ROM that is
packaged with the host adapter.
Step Two: Install the Xr 920 ISA host adapter
Before installing the Xr 920 host adapter, you should do the following:
• Check system resources for a free I/O port address. The Xr 920
adapter uses four bytes of address space on the I/O bus of the com-
puter into which you are installing it.
• Wear an ESD wrist strap to ground yourself while handling the
adapter. If one is not available, discharge static electricity from your
body by touching an unpainted metal surface, such as the computer’s
chassis, prior to handling the adapter.
• Record the adapter serial number, which will enable Digi to provide
you with better service, should the need arise. The serial number label
has this general format: S/N: (S) XXX XXXXX
• Unplug power from the PC.
Figure 18. Xr 920 ISA host adapter
1. Set the I/O port address of the adapter to one of the following
addresses using the DIP switch at the location indicated in Figure 18:
2. Remove the computer’s cover.
3. Locate an available ISA slot in your computer and remove the slot
plate.
4. Insert the adapter into the slot and screw the endplate to the computer
chassis. The endplate must be screwed into the computer chassis to
remain in compliance with Part 15 of FCC rules.
5. Replace the computer’s cover.
6. Attach the 78-pin end of a Digi connector assembly to the connector
on the adapter.
Step Three: Install peripheral cabling
You can connect modems, terminals, serial printers (or any other standard
EIA-232 device to be controlled by applications on the computer) to an
AccelePort Xr 920 host adapter by installing a cable between the periph-
eral and the Digi connector assembly.
On the peripheral end of the cable, the connector you use depends on the
requirements of the peripheral. The Digi end of the cable must fit either
an RJ-45 or DB-25 connector, depending on the Digi connector assembly
you have.
The pin assignments for each type of connector used on the connector
assemblies are as follows:
DB-25 Pin Assignments
I/O
address 1234
104-107h up up down down
114-117h up down up down
124-127h up down down down
204-207h down up up down
224-227h down up down down
304-307h down down up down
324-327h down down down down
Signal Description Pin
GND Chassis Ground 1*
TxD Transmitted Data 2
RxD Received Data 3
RTS Request To Send 4
CTS Clear To Send 5
DSR Data Set Ready 6
SG Signal Ground 7
DCD Data Carrier Detect 8
DTR Data Terminal Ready 20
RI Ring Indicator 22
* Chassis Ground is also available on the
connector shell