Serialh7terface
Pin Name Function
1GND Printer’schassisground.
2TXD Thispincarriesdata fromtheprinter.
3RXD Thispincarriesdata tothe printer.
4RTS Thispinis alwayssetspace.
ThispinisSpacewhenthecomputerisreadyto send
5CTS data.
This printerdoesnotcheck thispin.
6N/C
7GND Signalground.
8-10 N/C
Thisprinterturn thispin Spacewhen it isready to
11 RCH receivedata.
Thislinecarriesthe samesignalaspin 20.
12 N/C
13 GND Signalground.
14-19 N/C
Thisprinterturnsthispin Sapce whenitis readyto

20 IN-R receivedata.

21-25 N/C

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