INTERFACES
TRADITIONAL
PC ADAPTER CARD
Form 468-010131
DATA
SHEET
page 3/6
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • Phone: (951) 695-3000 • (800) 321-OPTO • Fax: (951) 695-3095 • www.opto22.com
Inside Sales: (800) 321-OPTO • Product Support: (800) TEK-OPTO • (951) 695-3080 • Fax: (951) 695-3017 • E-mail: [email protected]
Jumper Installation
Configuration for AC24AT and AC422AT
Before installing your adapter card, configure your board by selecting the appropriate address, interrupt, and
communications jumpers.
These adapter cards can be configured as COM1 through COM4. Select which COM port is to be used based on the current
configuration of the COM ports in the host PC. Refer to the following table for jumper settings for the various COM ports.
Compatibility
The AC422AT and AC24AT models use the same UART used in the AT model computers.
The RS-422/485 adapter cards are seen by the computer as a standard serial port and will pass the IBM Advanced
Diagnostics program if a loop-back connector is used. The following is a diagram of a loop-back connector for use in
diagnosing the adapter card.
Loop-back Connector
AC24AT
AC422AT
Address
IRQ
Group A
Jumpers Installed
IRQ
Jumpers
COM1
3F8 Hex
4
None
COM1
COM2
2F8 Hex
3
8
COM2
COM3
348 Hex
2
4,5,7
IRQ2
COM4
340 Hex
5
3,4,5,7
IRQ5
