The following 3-wire cable is often sufficient for a terminal, printer or other DTE device configured for software flow control.
| RJ-11 (Digi End) | DB-25 Male (Peripheral) | |||
|---|---|---|---|---|
| Signal | Pin | Pin | Signal | |
|
TxD |
2 |
connected to |
3 |
RxD |
|
RxD |
3 |
connected to |
2 |
TxD |
|
SG |
4 |
connected to |
7 |
SG |
|
GND |
1 |
connected (via shield) to |
1 (or shell) |
GND |
This cable is a 3-wire null modem cable. Transmitted Data on one end of the cable is connected to Received Data at the other end, and vice versa.
The RJ-11 plug fits into the center of the RJ-45 jack. The male DB-25 end can be plugged directly into most serial terminals and printers without any adapters.
An RJ-45 8-pin connector uses the same wiring with the center pins only--pins 3, 4, 5, and 6. See RJ Connector Types for a comparison of various RJ connector types that work with the Digi 10-pin RJ-45 jack.