Connector - RS422 37pin37 PIN D-SUB MALE at the DTE (Computer).
37 PIN D-SUB FEMALE at the DCE (Modem). | (at the DCE) |  | (at the DTE) |
| Pin | Name | Direction | Description |
|---|
| 1 | GND | --- | Shield Ground | | 2 | SRI | Input | Signal Rate Indicator | | 3 | n/c | --- | Spare | | 4 | SD | Output | Send Data | | 5 | ST | Output | Send Timing | | 6 | RD | Input | Receive Data | | 7 | RTS | Output | Request To Send | | 8 | RR | Input | Receiver Ready | | 9 | CTS | Input | Clear To Send | | 10 | LL | Output | Local Loopback | | 11 | DM | Input | Data Modem | | 12 | TR | Output | Terminal Ready | | 13 | RR | Input | Receiver Ready | | 14 | RL | Output | Remote Loopback | | 15 | IC | Input | Incoming Call | | 16 | SF/SR | Output | Select Frequency/Select Rate | | 17 | TT | Output | Terminal Timing | | 18 | TM | Input | 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 | Input | Terminal In Service | | 29 | /DM | --- | Data Mode TPR | | 30 | /TR | --- | Terminal Ready TPR | | 31 | /RR | --- | Receiver TPR | | 32 | SS | Output | Select Standby | | 33 | SQ | Input | Signal Quality | | 34 | NS | Output | New Signal | | 35 | /TT | --- | Terminal Timing TPR | | 36 | SB | Input | Standby Indicator | | 37 | SC | --- | Send Twister Pair Common |
Note: Direction is DTE (Computer) relative DCE (Modem).
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