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Interface Specifications
Pin assignments for the serial interface
Pin
Signal Direction Description
1
Chassis GND -
This
is connected to the printer chassis.
2
TXD
OUT
Transmits data for X-ON/X-OFF.
3
RXD
IN
Received data. This pin transmits serial
data from the computer to the printer.
7
Signal GND -
Signal (logic) ground level.
11
REV
OUT
Same as DTR.
(= 2nd RTS)
20
DTR
OUT
Data terminal ready. This pin indicates
whether the printer is ready to receive
data. If the printer ready protocol is not
selected, this pin is always HIGH (that
is, the printer is ready to receive data). If
the printer ready protocol is selected,
the printer can accept data when the pin
level is LOW. When the DTR signal
goes LOW, the host computer must stop
sending data within 128 characters, The
DTR signal can be set HIGH or LOW
with SelecType.
Note: The column heading “Direction” refers to the direction of signal flow as
viewed from the printer.
Technical Specifications
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