User's Manual

Connecting the apC/8X to a Host
apC/8X Technical Manual 4-7
Modems for Dialup Mode apC/8Xs
Use dialup mode to connect a host to an apC/8X at a remote location using
standard, voice-grade telephone lines instead of hard wired or leased
telephone lines. For many applications, dialup mode can be more convenient
and cost-effective than other communications modes.
In dialup mode, the apC/8X modem must use DTR. Connect modems using
standard straight through cables.
Caution: Connect DTR to the apC/8X only if you are connecting
the apC/8X to a modem. Using DTR with an apC/8X connected
directly to the host can result in hardware malfunction.
Table 4.4 lists the pins used for dialup mode. See “Configuring Modems for
Use with Dialup Lines,” on page D-2 for information about DIP switch
settings.
Note: The use of modems in conjunction with the apC/8X has not been
evaluated by UL.
Table 4.4: apC/8X to Dialup Modem Connections
apC/8X Modem
P32 Pin # DB-25 Pin # Signal
1 2 Data transmit (TX)
2 20 DTR (connected for dialup only)
(3) (5) Required for some modems, Turn S1:3 to Off for
5-wire connection.
4 3 Data receive (RX)
5 7 Ground (GND)