
Step One: Plan your setup
An AccelePort Xr 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 and up to eight peripherals to an AccelePort 8r 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. Cable lengths of up to 4000 feet
are permissible with the EIA-422 interface. To achieve the greatest
reliability over distance, cables should be:
• Shielded, twisted pair cables.
• 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 a cable for each peripheral that you will be attaching to the host
adapter. The connector type that you need at either end of the periph-
eral cable depends on the type of Digi cable assembly that you use
and the connector on the peripheral.
Digi cable assemblies are available with DB-9 or DB-25 connectors.
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 and 8r, such as specifica-
tions and cabling details, is provided on the CD-ROM that is packaged
with the host adapter.
Step Two: Install the Xr PCI host adapter
Before installing the Xr host adapter, you should do the following:
• 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.
1. Remove the computer’s cover.
2. Locate an available PCI slot in your computer and remove the slot
plate.
3. 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.
4. Replace the computer’s cover.
5. Attach the 78-pin end of a Digi cable assembly to the connector on
the adapter.
Step Three: Install peripheral cabling
You can connect any standard EIA-422 device to be controlled by appli-
cations on the computer, to an AccelePort Xr host adapter by installing a
cable between the peripheral and the Digi cable assembly.
On the peripheral end of the cable, the connector you use depends on the
requirements of the peripheral. The other end of the cable must fit either a
DB-9 or DB-25 connector, depending on the Digi cable assembly you
have. The pin assignments for each type of connector used on the Digi
cable assemblies are industry standard:
DB-25 Pin Assignments
DB-9 Pin Assignments
Refer to the CD-ROM for more detailed cabling information.
Signal Description Pin
GND Chassis Ground 1, 7 *
TxD A (+) Transmitted Data (+) 2
TxD B (-) Transmitted Data (-) 14
RxD A (+) Received Data (+) 3
RXD B (-) Received Data (-) 16
RTS A (+) Request To Send (+) 4
RTS B (-) Request To Send (-) 19
CTS A (+) Clear To Send (+) 5
CTS B (-) Clear To Send (-) 13
* Chassis Ground is also available on the
connector shell
Signal Description Pin
GND Chassis Ground Shell
TxD A (+) Transmitted Data (+) 8
TxD B (-) Transmitted Data (-) 9
RxD A (+) Received Data (+) 6
RXD B (-) Received Data (-) 7
RTS A (+) Request To Send (+) 2
RTS B (-) Request To Send (-) 3
CTS A (+) Clear To Send (+) 4
CTS B (-) Clear To Send (-) 5