Owner`s manual

12
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The composite ports of multiple Telplex units are connected together
via external modems ( Section 3.5.1 ) or cable ( Section 3.5.2 ).
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See Section 3.5.1.1 if connecting a modem to a TX104 or TX108 or
Section 3.5.1.2 if connecting a modem to a TX102.
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If an external modem will be used to connect a local TX104 or TX108
to a remote Telplex, the modem should be connected to the
COMPOSITE EIA-232 port on the back panel of the unit (see
Appendix B ). The TX104 or TX108 should be programmed to operate
with a Line Type of Modem (see Section 5.8 ).
The standard configuration of the COMPOSITE EIA-232 port is DTE
(Data Terminal Equipment) with a DB-25 male connector which uses
the following signals for communication:
TX104 AND TX108 EIA-232 COMPOSITE PORT PIN/SIGNAL DEFINITION
Pin Signal
(EIA-232)
Direction Description
1 PGND --- Protective Ground
2 TX Output Data Out
3 RX Input Data In
4 RTS Output +12 volts when Telplex is powered up
5 CTS Input Transmit enabled when +12 volts. Enabled if no connection.
7 SGND --- Signal Ground
8 DCD Input Data Carrier Detect. Controlled by modem.
20 DTR Output +12 Volts