25 PIN D-SUB MALE at the DTE (Computer).
25 PIN D-SUB FEMALE at the DCE (Modem).
Pin | Name | Direction | Description |
---|
1 | GND | --- | Shield Ground (n/a) (V.24 101) |
2 | TXD | Output | Transmit Data (BA) (V.24 103) |
3 | RXD | Input | Receive Data (BB) (V.24 104) |
4 | RTS | Output | Request to Send (CA) (V.24 105) |
5 | CTS | Input | Clear to Send (CB) (V.24 106) |
6 | DSR | Input | Data Set Ready (CC) (V.24 107) |
7 | GND | --- | System Ground (AB) (V.24 102) |
8 | CD | Input | Carrier Detect (CF) (V.24 109) |
9 | - | --- | RESERVED |
10 | - | --- | RESERVED |
11 | STF | Output | Select Transmit Channel (V.24 126) |
12 | S.CD | Input | Secondary Carrier Detect (SCF) (V.24 122) |
13 | S.CTS | Input | Secondary Clear to Send (SCB) (V.24 121) |
14 | S.TXD | Output | Secondary Transmit Data (SBA) (V.24 118) |
15 | TCK | Input | Transmission Signal Element Timing (DB) (V.24 114) |
16 | S.RXD | Input | Secondary Receive Data (SBB) (V.24 119) |
17 | RCK | Input | Receiver Signal Element Timing (DD) (V.24 115) |
18 | LL | Output | Local Loop Control (LL) (V.24 141) |
19 | S.RTS | Output | Secondary Request to Send (SCA) (V.24 120) |
20 | DTR | Output | Data Terminal Ready (CD) (V.24 108.2) |
21 | RL | Output | Remote Loop Control (RL) (V.24 140) |
22 | RI | Input | Ring Indicator (CE) (V.24 125) |
23 | DSR | Output | Data Signal Rate Selector (CH) (V.24 111) |
24 | XCK | Output | Transmit Signal Element Timing (DA) (V.24 113) |
25 | TI | Input | Test Indicator (TM) (V.24 142) |