Pin | DTE | DCE | Description (DTE) |
---|---|---|---|
1 | — | 5V | Not used |
2 | RXD | TXD | RXD (receive data) input to the printer. |
3 | TXD | RXD | TXD (transmit data) output from the printer. |
4 | DTR | DSR | DTR (data terminal ready) output from the printer -- controls when the host may send data. |
5 | GND | GND | Circuit ground. |
6 | DSR | DTR | DSR (data set ready) input to the printer. |
7 | RTS | CTS | RTS (request to send) output from the printer -- always in the ACTIVE condition when the printer is turned on. |
8 | CTS | RTS | CTS (clear to send) - Not used by the printer. |
9 | 5V | — | +5 V @ 0.75 A - FET Circuit current limited. |
DB-25S Connector to DTE Device (PC) | DB-9P Connector to Printer | DB-9S Connector to DTE Device (PC) | DB-9P Connector to Printer | |||
DB-25S Connector to DCE Device | DB-9P Connector to Printer | DB-9S Connector to DCE Device | DB-9P Connector to Printer | |||