Datalogic DX8200A Reference Manual page 27

INSTALLATION
RS485 Full-Duplex Interface
The RS485 full-duplex interface is used for non-polled communication protocols in
point-to-point connections over longer distances than those acceptable for RS232
communications or in electrically noisy environments. The overall maximum cable length
should not exceed 1200 m (3937 ft).
The following pins of the 26-pin connector are used for RS485 full-duplex interface
connection:
Pin Name
2 TX485 +
3 RX485 +
4 TX485 -
5 RX485 -
7 GND-ISO
DX8200A
2
3
4
5
7
1
Figure 5 - RS485 Full-Duplex Interface Connections
Function
RS485 output (+)
RS485 input (+)
RS485 output (-)
RS485 input (-)
Main signal ground
USER INTERFACE
TX485+
RX485+
RX485+
TX485+
TX485-
RX485-
RX485-
TX485-
GND_ISO
SGND Main Isolated
CHASSIS
Earth
Ground
2
11