Owner`s manual

114
Refer to the following modular adapter drawings to interface your
computers or terminals to the V74 or V75 module using EIA-232 serial
interface. Use the "...PC-3" adapters in applications where a port of
the V75 will look like a modem connection when a computer or
terminal is connected to the port. Some terminals and popular
communications software packages require that DCD is "high" for a
connection to be completed. Refer to Figure 33 if your
computers/terminals have DB-25 male connectors or to Figure 34 if
your computers/terminals have DE-9 connectors.