Specifications

2240 Fiber Optic Modem
65
There are six end-to-end control lead pairs. They are listed with the input signal
listed first.
TD to RD
STD to SRD
DTR to RI
SRTS to SDCD
DSRS to SCTS
RTS to DCD
Table 4-I.
RS-423 Pinouts
for Model MC1
Pin RS-232 Direction
Number Pin Name
(abbrev) (full name)
1 PG Protective Ground -
2 TD Transmit Data to modem
3 RD Receive Data from modem
4 RTS Request to Send to modem
5 CTS Clear to Send from modem
6 DSR DCE Ready from modem
7 SG Signal Ground -
8 DCD Receive Line Sig. Det. from modem
12 SDCD Secondary Line Sig. Det. from modem
13 SCTS Secondary CTS from modem
14 STD Secondary TD to modem
16 SRD Secondary RD from modem
19 SRTS Secondary RTS to modem
20 DTR DTE Ready to modem
22 RI Ring Indicator from modem
23 DSRS Data Signal Rate Selector to modem
25 TM Test Mode from modem