EC-520 User’s Manual
Printer’s 26PIN connector
PDIUSBD12 chip
USB-B connector
Figure 5-5 connecting figure of printer and computer with USB interface
USB Interface is 2.0 Full-Speed interface, and displayed as a USB port on the computer
finally. You can use the USB Interface to print by selecting corresponding USB port.
5.2.4 Serial Interface
(1) Serial interface is RS-232 type and the connector type is DB-25.
The DB-25 connector is shown as Figure 5-6.
Figure 5-6 pin’s NO. of the serial interface connector
(2) Connecting figure of printer and computer with serial interface
The figure is shown as follows:
DTR
GND
TXD
RXD
DSR
5
2
3
6
8
1
3
2
7
20
TXD
GND
RXD
DCD
CTS
Host computer’s 9PIN connector
Printer’s 25PIN connector
Figure 5-7 connecting figure of printer and computer with serial interface
(3) Definition of pins
Definition of each pin of RS-232 serial interface is shown in Table A-3:
Table A-3 Definition of pins of RS-232 serial interface
Pin NO.
Signal name
Signal Direction
1
FG Frame GND
2
TXD Data output
Output
3
RXD Data input
Input
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