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C-13
Appendix C
Host Computer Interface
Overview of Signals (RS-422A)
FG - Frame Ground - (Pin 1)
This pin is connected directly to the printer frame.
RDA - Receive Data Inverted - (Pin 3)
RDB - Receive Data - (Pin 18)
These pins carry asynchronous data sent from the computer to the printer. (differential input)
SG - Signal Ground - (Pin 7)
All signals can transmit between the printer and the host computer to send each signals with a
signal ground.
SDA - Send Data Inverted - (Pin 9)
SDB - Send Data - (Pin 10)
These pins carry asynchronous data sent from the printer to the computer. (differential output)
+5V DC (Pin 11)
This line is connected to the printer’s +5V DC line (+5V ±0.5V, 250 mA [Parallel and Serial total]
maximum, fused).
RS-422A interface voltage levels
The interface signal voltage levels conform with the EIA RS-422A standard. The differential voltage
varies from 200 mV to 6 V.
SERIAL Connector
The connector marked “IOIOI” (RS-232C/RS-422A) on the rear panel is a DB-25S connector. Use
a DB-25P connector (or equivalent) for the connector on the cable.