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Interface Signals
The pins in the printer's RS-422A interface connector carry the signals listed in Table C.3.
Table C.3. RS-422A Signal Pin Assignments
Pin
In/out
1
–
3
In
7
–
9
Out
10
Out
18
In
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 signals 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 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.
Signal
Description
FG
Frame ground
RDA
Receive data Inverted
SG
Signal ground
SDA
Send data Inverted
SDB
Send data
RDB
Receive data
C.2. RS-232C/RS-422A Interface
C-7
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