Owner`s manual

13
The EIA-232 port of an external modem is DCE (Data Communication
Equipment) with a DB-25 female connector. Please see Section 3.6
for a pin definition of a DCE device.
Use the pinout shown in Figure 3 to connect an external modem to
the TX104 or TX108 COMPOSITE EIA-232 port.
TX104 or TX108 MODEM
FEMALE DB-25 MALE DB-25
You may issue commands to the external modem from selected
terminal devices when the Telplex is in Access Local Modem mode.
Please see the technical documentation for your modem to determine
which commands are supported.
WARNING: XON/XOFF flow control must be disabled on the
modems. Failure to do so will result in erroneous characters
appearing in addition to the data being sent.
1
2
3
4
5
6
7
8
20
1
2
3
4
5
6
7
8
20
PGND
TXD
RXD
RTS
CTS
DSR
SGND
DCD
DTR
<
<
<
>
>
>
>
DTR
DCD
SGND
DSR
CTS
RTS
RXD
TXD
PGND
: Straight DB-25 Cable