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C.2. RS-232C/RS-422A Interface
C-9
RDB - Receive Data - (Pin 18)
RDA - Receive Data Inverted - (Pin 3)
These pins carry asynchronous data sent from the computer to the printer. (differential input)
SDB - Send Data - (Pin 10)
SDA - Send Data Inverted - (Pin 9)
These pins carry asynchronous data sent from the printer to the computer. (differential output)
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 6V.
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.