Use the chart below as a guide for EIA-422 modem wiring. Pin numbers have been omitted because they vary from product to product. For Digi pin numbers, see Digi EIA-422 Pinouts. For modem pin numbers, see your modem's documentation.
| DTE (Digi End) | DCE (Modem) | |||
|---|---|---|---|---|
| Signal | Lead | Lead | Signal | |
| TxD | + | Connected to | + | TxD |
| - | Connected to | - | ||
| RxD | + | Connected to | + | RxD |
| - | Connected to | - | ||
| RTS | + | Connected to | + | RTS |
| - | Connected to | - | ||
| CTS | + | Connected to | + | CTS |
| - | Connected to | - | ||
| GND | Connected to | GND | ||