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Serial Interface
Pin Name
Function
1 GND
Printer’s chassis ground
‘
TXD
This pin carries data from the printer
3
RXD This pin carries data to the printer
, I
4 RTS
This pin is always set to Space
5 CTS
This pin is Space when the computer is ready to send
data. This printer does not check this pin
6 N/C
7
GND
Signal ground
I 8-10 I N/C I
11 RCH This printer turns this pin to Space when it is ready to
receive data. This line carries the same signal as pin 20
I 12 I N/C I
I
13 GND
Signal ground
14-19
N/C
20 DTR
This printer turns this pin to Space when it is ready to
receive data
21-25 NIC