6
2-2-1. Interface Connector
<D-SUB 25 Female Serial> <Centronics Parallel>
<USB “B” Type> <Ethernet>
USB Interface
Pin
Signal
I/O
Description
1
+5V
-
+5V
2
DATA-
-
Printer transmit data line
3
DATA+
-
Printer transmit data line
4
GND
-
System Ground
Serial Interface
PIN
SIGNAL
I/O
DESCRIPTION
2
TxD
Output
Printer transmit data line RS-232C level
3
RxD
Input
Printer receive data line RS-232C level
4, 20
DTR
Output
Printer handshake to host line RS-232C level
6
DSR
Input
Data Send Ready
1, 7
GND
-
System Ground
