Comtrol DB25 - RJ11 to Standard DB25 (Null-Modem Configuration); RJ11 to Standard DB9 (Null-Modem Configuration)

32 [Documentation number: 2000430 Rev B] Cable Adapters
8J RJ11 to Standard DB25 (Null-modem Configuration)
8J RJ11 to Standard DB25 (Null-modem Configuration)
The following table displays the modem wiring connection from a Comtrol 8J RJ11
to a standard DB25 connector.
Note: If your DB25 wiring differs from the one shown below, adjust the DB25
pinouts accordingly.
8J RJ11 to Standard DB9 (Null-modem Configuration)
The following table displays the modem wiring connection from a Comtrol 8J RJ11
to a standard DB9 Connector.
Note: If your DB9 wiring differs from the one shown below, adjust the DB9
pinouts accordingly.
8J RJ11 Connector Pinouts
a
a. RJ11 does not have all of the signals for RTS CTS (hardware handshaking). Use the cable for
XON/XOFF (software handshaking).
DB25 Connector Pinouts
Pin RS-232 Signal Pin RS-232 Signal
1NC
4RxD 2TxD
3TxD 3RxD
6 CTS 4 RTS
b
b. RTS and CTS may be jumpered together.
5CTS
b
1DTR 6DSR
2SigGnd 7SigGnd
5 DCD 8 DCD
20 DTR
8J RJ11 Connector Pinouts
a
a. RJ11 does not have all of the signals for RTS CTS (hardware handshaking). Use the cable for XON/
XOFF (software handshaking).
DB9 Connector Pinouts
Pin RS-232 Signal Pin RS-232 Signal
5DCD 1DCD
3 TxD 2 RxD
4 RxD 3 TxD
4DTR
2 Signal GND 5 Signal GND
1DTR 6DSR
6CTS 7RTS
b
b. RTS and CTS may be jumpered together.
8CTS
b
9NC
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