Pin | DTE | DCE | Description (DTE) |
|---|---|---|---|
1 | — | 5V | Not used.
|
2 | RXD | TXD | Receive data (RXD) input to the printer.
|
3 | TXD | RXD | Transmit data (TXD) output from the printer.
|
4 | DTR | DSR | Data terminal ready (DTR) output from the printer—controls when the host may send data.
|
5 | GND | GND | Circuit ground.
|
6 | DSR | DTR | Data set ready (DSR) input to the printer.
|
7 | RTS | CTS | Request to send (RTS) output from the printer—always active when printer power is on.
|
8 | CTS | RTS | Clear to send (CTS)—Not used by the printer.
|
9 | 5V | — | +5 V @ 0.75 A—FET Circuit current limited.
|
