20
USB-COM
as
below
RS485
as
below.
PIN
Definition
Interface
Function
RX1
RS232-1 recieve
RS232-1
Continues Tranmit
TX1
RS232-1 transmit
GND
Earthing
RX2
RS232-1 recieve
RS232-2
Printing
TX2
RS232-1 transmit
GND
Earthing
8X3
RS232-1 recieve
RS232-3
Electrical
Isolation
C18:
Commanding mode
Printing mode
Continues transmit mode
TX3
RS232-1 transmit
GND
Earthing
A
RS485 output A
RS485
Electrical isolation
Commanding mode
B
RS485 output B
USBV+
USB power
USB to COM
Electrical isolation
Commanding mode
D-
Data-
D+
Data+
GND
USB earthing