Interface signals, Overview of signals (rs-422a), Rs-422a interface voltage levels – Kyocera FS1750 User Manual
Page 114: Serial connector
C.2. RS-232C/RS-422A Interface
C-7
Interface Signals
The pins in the printer's RS-422A interface connector carry the signals listed in Table C.3.
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.
Table C.3. RS-422A Signal Pin Assignments
Pin
In/out
Signal
Description
1
–
FG
Frame ground
3
In
RDA
Receive data Inverted
7
–
SG
Signal ground
9
Out
SDA
Send data Inverted
10
Out
SDB
Send data
18
In
RDB
Receive data