RS232, RS422, RS485在接線接口方面都使用DB9 9針接口,但各引腳的含義不同。各接口的引腳區別如下表描述。
Pin | Mode | RS232 | RS422 | RS485 |
1 | DCD | DCD+ | - | |
2 | RXD | RX+ | - | |
3 | TXD | TX+ | D+ | |
4 | DTR | DTR+ | - | |
5 | GND | GND | GND | |
6 | DSR | RX+ | - | |
7 | RTS | RX- | D- | |
8 | CTS | DCD- | - | |
9 | - | DTR- | - |
RS232, RS422, RS485在接線接口方面都使用DB9 9針接口,但各引腳的含義不同。各接口的引腳區別如下表描述。
Pin | Mode | RS232 | RS422 | RS485 |
1 | DCD | DCD+ | - | |
2 | RXD | RX+ | - | |
3 | TXD | TX+ | D+ | |
4 | DTR | DTR+ | - | |
5 | GND | GND | GND | |
6 | DSR | RX+ | - | |
7 | RTS | RX- | D- | |
8 | CTS | DCD- | - | |
9 | - | DTR- | - |