Using an 8-pin plug, the following cable wiring is often sufficient for a terminal, printer, or other DTE device configured for DTR (hardware) flow control. However, some terminals and printers may use a signal other than DTR for flow control. In addition, some terminals and printers may have other cable requirements. Consult your terminal or printer manual for this information. For more universal compatibility, use the RJ-45 10-wire terminal/printer cable or a Digi RJ-45 to DB-25 adapter.
| RJ-45 (Digi End) | DB-25 Male (Peripheral) | |||
|---|---|---|---|---|
| Signal | Pin | Pin | Signal | |
| TxD | 4 | connected to | 3 | RxD |
| RxD | 5 | connected to | 2 | TxD |
| CTS* | 7 | connected to | 20 | DTR |
| SG | 6 | connected to | 7 | SG |
| GND | 3 | connected (via shield) to | 1 (or shell) | GND |
| jumpered | 4 & 5 | RTS & CTS | ||
* Some Okidata printers use a control signal on pin 11, called Supervisory Send Data (SSD) instead of DTR. In this case, simply connect CTS on the RJ-45 side to pin 11 of the DB-25, instead of pin 20.