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Serialinterface
Pin
Name
I
Function
I
I
I
1
GND
Printer chassis ground
I
I
2
TXD
Data from printer
I
I
3
Data to printer
1
1
4
RTS
Always low
5
CTS
LOWwhen the computer is ready to
transmit data
Printer ignores this signal
I 11
I RCH
I
I
Printer sets line low when ready to
receive data. Same signal as pin 20
20
DTR
I
Printer sets line low when ready to
receive data.
I
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