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7-4. Connectors and Signals
Pin No.
Signal
Direction Function
Name
1 GND — Shield Ground
2 GND — Frame Ground
3 TXD OUT
This pin carries data from the printer.
(Return channel)
4 RXD IN This pin carries data to the printer.
5 RTS OUT This is SPACE when the printer power is ON.
6 FAULT OUT
This is MARK when the printer is abnormal.
(Machine Error.) Or there is a paper error.
7 GND — Signal ground.
8 DTR OUT
This printer turns this pin SPACE when
it is ready to receive data.
Figure 7-3. Modular Jack Connector
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