Using an 8-pin RJ-45 plug, the following cable wiring supports most serial terminals or printers with either software or hardware handshaking using the Digi ALTPIN option.
Most terminals and printers use Request to Send/Clear to Send (RTS/CTS) for hardware handshaking. The cable shown supports this method.
| RJ-45 8-pin (Digi End) |
DB-25 Male (Terminal/Printer) |
|||
|---|---|---|---|---|
| Signal | Pin |
Pin |
Signal |
|
|
DCD* |
1 |
connected to |
20 |
DTR |
|
RTS |
2 |
connected to |
5 |
CTS |
|
GND |
3 |
connected (via shield) to |
Shell |
GND |
|
TxD |
4 |
connected to |
3 |
RxD |
|
RxD |
5 |
connected to |
2 |
TxD |
|
SG |
6 |
connected to |
7 |
SG |
|
CTS |
7 |
connected to |
4 |
RTS |
|
DTR |
8 |
connected to |
6+8 |
DSR+ DCD |
* ALTPIN must be turned on for pin 1 to be DCD. When ALTPIN is enabled, DCD becomes available on pin 1 of an 8-pin RJ-45 connector (equivalent to pin 2 of a 10-pin connector).
Important: Some terminal or printer manufacturers may use different methods of flow control. Consult your documentation for specific wiring requirements.