DS57U3
RS232/422/485 Assignment
| RS-232 | RS-422 | RS-485 | ||
|---|---|---|---|---|
 | PIN | COM | COM | COM |
| 1 | DCD1# | 422 TX - | 485 - | |
| 2 | SIN1 | 422 TX + | 485 + | |
| 3 | SOUT1 | 422 RX - | ||
| 4 | DTR1 | 422 RX + | ||
| 5 | GND | |||
| 6 | DSR1# | |||
| 7 | RTS1 | |||
| 8 | CTS1# | |||
| 9 | RI1# |
Where is COM port #1?
The first COM port is marked on this photo:
