Serial Interface (Option)
Overview of Signals (RS-422A)
FG - Frame Ground - (Pin 1)
This pin is connected directly to the printer frame.
SG - Signal Ground - (Pin 7)
All signals can transmit between the printer and the host computer to send each signal with a signal ground.
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
SERIAL Connector
The connector marked “IOIOI”