REC 3838 6-5
RS-232 CONNECTIONS
FIGURE 6-2
6.2.2 External Communication Cabling
This sections shows typical connections necessary for hooking up the RS-232 and
the RS-485 cable to the external device. Appendix A contains drawings showing
the cables necessary to hook up the serial interface to your external device.
An aid in the Test Menu called "Comm Loop Back" is supplied for hooking up the
serial interface of the AC-4000. This menu outputs the alphabet on the selected
serial channel. If the AC-4000 receives the same data back as it sends out, the
menu indicates "PASS". Your device probably will not send back the data, so the
menu will indicate "FAIL". However, if your device prints the alphabet, the cabling
is probably working.
RS-232
Typical connections are shown in Figure 6-2. In some cases, wires may need to
be swapped (null modem connections). This is done by swapping wires 2-3, 4-5,
and 6-20.
To make the Comm Loop Back test pass, hook a jumper between pins 2 and 3. If
you are using hardware handshaking, also jumper pins 4-5.
If your device cannot drive the RTS line, insure the dip switches are set to RS-232
data leads only.
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