Pin # Name Notes/Description
1 - Protective/shielded ground
2 TD Transmit Data
3 RD Receive Data
4 RTS Request To Send
5 CTS Clear To Send
6 DSR Data Set Ready
7 SGND Signal Ground
8 CD Carrier Detect
9 - Reserved for data set testing.
10 - Reserved for data set testing.
11 - Unassigned
12 SDCD Secondary Carrier Detect.
13 SCTS Secondary Clear to send.
14 STD Secondary Transmit Data.
15 DB Transmit Clock
16 SRD Secondary Receive Data.
17 DD Receive Clock
18 LL Local Loopback
19 SRTS Secondary Request to Send.
20 DTR Data Terminal Ready.
21 RL/SQ Signal Quality Detector/Remote loopback
22 RI Ring Indicator. DCE (Modem)
23 CH/CI Signal Rate selector.
24 DA Auxiliary Clock
25 - Unassigned
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