Rs-232 Cable Pinouts - Multitech MULTI MODEM II MT5600BL User Manual

MultiModemII User Guide
Label
RDL
RI
XCLK
TM

RS-232 Cable Pinouts

Fig. G-1. 25-pin to 25-pin RS-232 cable.
Fig. G-2. 9-pin to 25-pin RS-232 cable.
Pin I/O type Signal name/description
21 RDL Remote Digital Loop Input to modem to enable RDL test.
22 Ring Indicator RI output high indicates the presence of
a ring signal on the telephone line.
23 NC
24 XCLK External Clock Input to modem used in special syn-
chronous applications.
25 TM Test Mode Output from modem to indicate modem is
in one of the test modes.
DTE DB-25
connector
TD 2
RD 3
RTS 4
CTS 5
DSR 6
GND 7
CD 8
DTR 20
RI 22
DTE DB-9
connector
TD 3
RD 2
RTS 7
CTS 8
DSR 6
GND 5
CD 1
DTR 4
RI 9
G Pin Descriptions
DCE DB-25
connector
2 TD
3 RD
4 RTS
5 CTS
6 DSR
7 GND
8 CD
20 DTR
22 RI
DCE DB-25
connector
2 TD
3 RD
4 RTS
5 CTS
6 DSR
7 GND
8 CD
20 DTR
22 RI
101