Serial Port Connectors
9-pin Serial Port
Pin Use Name Direction
01 Data carrier detect DCD In
02 Received data RD In
03 Transmitted data TD Out
04 Data terminal ready DTR Out
05 Signal ground SG n/a
06 Data set ready DS In
07 Request to send RTS Out
08 Clear to send CTS In
09 Ring indicator RI In
\ 1 o o o o o 5 /
\ 6 o o o o 9 /
25-pin Serial Port
Pin Use Name Direction
01 Frame ground FG n/a
02 Transmitted data TD Out
03 Received data RD In
04 Request to send RTS Out
05 Clear to send CTS In
06 Data set ready DS In
07 Signal ground SG n/a
08 Data carrier detect DCD In
09 Positive DC test voltage In
10 Negative DC test voltage In
11 Equalizer mode QM In
12 Secondary data carrier detect SDCD In
13 Secondary clear to send SCTS In
14 Secondary trasmitted data SCTS Out
(New synchronization NS Out)
15 Transmitter clock TC In
16 Secondary recieved data SRD In
(Divided clock transmitter DCT In)
17 Receiver clock RC In
18 Divided clock receiver DCR In
19 Secondary request to send SRTS Out
20 Data terminal ready DTR Out
21 Signal quality detect SQ In
22 Ring indicator RI In
23 Data rate selector CH Out
(Data rate selector CI Out)
24 External transmitter clock TC Out
25 Busy Out
\ 1 o o o o o o o o o o o o o 13/
\14 o o o o o o o o o o o o 25/
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