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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.
(Refer to Error Condition Alarm Mode *1.)
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
*1 Error Condition Alarm Mode
If an error condition is detected during operation, the printer will stop
printing and cause the FAULT signal to go MARK. All solenoides &
motors will be de-energized. It is necessary to turn the printer power
off and on again in order to recover from the alarm mode.
This printer can detect the following error coditions:
a. Motor Lock
b. Defective timing detector
c. Micro-proccessor out of program sequence