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Communication
Model 1250
RS-232 Serial
Version
Pin No. Signal
1
Chassis ground
2
(TD) Transmitted
data
3
(RD) Received data
7
(SG) Signal
11
(CTS) Clear to send
Model 125X MiniPrinter Series User's Manual
This section shows the cable differences in the mod-
els of the 1250 series printer and the control codes
and communication protocols.
DTE Direction Description
-
From printer
To printer
-
From printer
The rest are not used.
Serial Interface Voltage Levels
Received data:
Mark = OFF = Logic "1" = -25V to -3V
Space = ON = Logic "0" = +25V to +3V
Clear to send:
Busy = OFF = Logic "1" = -9V
Not Busy = ON = Logic "0" = +9V
Transmitted data:
Mark = OFF = Logic "1" = -9V
Space = ON = Logic "0" = +9V
Cable shield
Printer data output line
Printer data input line
Signal ground
Signal (equivalent to
BUSY) indicating that
printer is ready for
operation and can
receive data.
23
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