AC7A/B User’s Guide
9
CONNECTING THE AC7A/B TO YOUR PC
A standard RS-232 serial cable may be used to connect the AC7A/B adapter card to the PC. One end of the
RS-232 cable must have a male 25-pin (DB-25) connector for the AC7A/B. The other end of the cable is for the PC,
and will most likely need either a 9-pin (DB-9) female connector, or a 25-pin (DB-25) female connector, depending
on your computer.
Figure 2-3: Standard Straight-Through 25-Pin to 25-Pin RS-232 Cable
Figure 2-4: Standard Straight-Through 9-Pin to 25-Pin RS-232 Cable
It is also possible to make your own cable for connections between the AC7A/B and an RS-232 device. The only
connections that are absolutely necessary are transmit and receive (RS-232 pins 2 and 3) and signal ground, which
is pin 7 of standard 25-pin connectors. Ground is usually pin 5 on 9-pin RS-232 connectors. (Note: the 9-pin
connector on the AC7A/B adapter card is for RS-485, not RS-232. This sections applies only to the 25-pin [DB-25]
RS-232 connection on the AC7A/B adapter card.)
INSTALLATION
