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Interface Specifications
Pin assignments for the serial interface:
Pin
I I
Number
Signal Direction
I
1
1
CG
1
-
1
2
1
TXD
1
OUT
I
I
3
RXD
IN
1
4-6
1
NC
1
-
1
11
(
DTR
1
OUT
I I
12-19
NC
-
1
20
1
DTR
1
OUT
121-251 NC
1
-
T-
Description
Printer chassis ground.
Transmits’ data for X-on/X-off.
Receives data.
Not used.
Signal (logic) ground.
Not used.
Indicates
whether the printer is ready to
receive input data. MARK level
,indicates
printer is not ready to receive data.
Not
used.
Same as pin
11.
Not used.
l The column heading “Direction” refers to the direction of signal
flow from the printer,
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Technical Specifications