Connector Pinouts
- Updated2025-10-09
- 2 minute(s) read
The following connectors are used with C Series serial modules.
The included cables (NI part number 182845-01) act as adapters between the two connector types. For more information about serial interface devices, visit ni.com/serial.
DB-9 Connector Pinout
| Pin | 232 Signal DTE | 485 Signal |
|---|---|---|
| 1 | DCD | GND |
| 2 | RXD | CTS+ (HSI+) |
| 3 | TXD | RTS+ (HSO+) |
| 4 | DTR | RXD+ |
| 5 | GND | RXD– |
| 6 | DSR | CTS– (HSI–) |
| 7 | RTS | RTS– (HSO–) |
| 8 | CTS | TXD+ |
| 9 | RI | TXD– |
External Power Connector Pinout
| Pin | Signal |
|---|---|
| 1 | Power (8–28 VSUP) |
| 2 | COM |
| 3 | Power (8–28 VSUP) |
| 4 | COM |
Note VSUP pins and
COM pins are hardwired together internally.
Modular Jack Connector (RJ50) Pinout
| Pin | 232 Signal | 485 Signal |
|---|---|---|
| 10 | DCD | GND |
| 9 | RXD | CTS+ (HSI+) |
| 8 | TXD | RTS+ (HSO+) |
| 7 | DTR | RXD+ |
| 6 | GND | RXD– |
| 5 | DSR | CTS– (HSI–) |
| 4 | RTS | RTS– (HSO–) |
| 3 | CTS | TXD+ |
| 2 | RI | TXD– |
| 1 | No Connect | No Connect |