Rs-232 cabling, Rs-232 signal levels – Epson LABELWRITER SE450 User Manual
Page 10
Configuring the Host Computer for RS-232 Serial Interface
RS-232 Cabling
RS-232 cable pinouts are shown in the table below. For details on RS-232 signal names,
consult the RS-232 Standard documentation.
Origination
(Mod. 8 x 8)
Termination
(DB9S)
Name
Dir
Description
1
8
RTS
Out
Printer is ready to receive data
2
3
RX
In
Data to the printer
3
2
TX
Out
Data from the printer
4
5
GND
--
Signal, earth, and power ground
5
7
CTS
In
Depends on software selection
6
6
DTR
Out
Indicate printer is online
Modular Plug
RS-232 Signal Levels
The serial interface uses standard RS-232 signal levels as shown in the table below:
Signal Level
Input
Output
MARK (1)
-27 V to -5 V
-5 V
SPACE (0)
+5 V to +27 V
+12 V
RS-232 signal levels.
4