# RS422 37pin

(at the DTE)
(at the DCE)

37 PIN D-SUB MALE at the DTE (Computer).
37 PIN D-SUB FEMALE at the DCE (Modem).

Pin | Name | Dir | Description
--- | --- | --- | ---
1 | GND |  | Shield Ground
2 | SRI |  | Signal Rate Indicator
3 | n/c | - | Spare
4 | SD |  | Send Data
5 | ST |  | Send Timing
6 | RD |  | Receive Data
7 | RTS |  | Request To Send
8 | RR |  | Receiver Ready
9 | CTS |  | Clear To Send
10 | LL |  | Local Loopback
11 | DM |  | Data Modem
12 | TR |  | Terminal Ready
13 | RR |  | Receiver Ready
14 | RL |  | Remote Loopback
15 | IC |  | Incoming Call
16 | SF/SR |  | Select Frequency/Select Rate
17 | TT |  | Terminal Timing
18 | TM |  | Test Mode
19 | GND |  | Ground
20 | RC |  | Receive Twister-Pair Common
21 | GND |  | Spare Twister-Pair Return
22 | /SD |  | Send Data TPR
23 | GND |  | Send Timing TPR
24 | GND |  | Receive Timing TPR
25 | /RS |  | Request To Send TPR
26 | /RT |  | Receive Timing TPR
27 | /CS |  | Clear To Send TPR
28 | IS |  | Terminal In Service
29 | /DM |  | Data Mode TPR
30 | /TR |  | Terminal Ready TPR
31 | /RR |  | Receiver TPR
32 | SS |  | Select Standby
33 | SQ |  | Signal Quality
34 | NS |  | New Signal
35 | /TT |  | Terminal Timing TPR
36 | SB |  | Standby Indicator
37 | SC |  | Send Twister Pair Common

Note: Direction is DTE (Computer) relative DCE (Modem).

Contributor: Joakim Ögren, Petr Krc

Source:
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Copyright © The Hardware Book Team 1996-2001.
May be copied and redistributed, partially or in whole, as appropriate.
Document last modified: 2001-06-07