User manual

Dx34510b_oi_e.doc / Jun-15 Page 10 / 42
2.6. Serial RS232 / RS485 interface (DX 348 only)
Ex-factory the unit is set to RS232 communication. This setting can be changed to RS485
(2-wire) by means of an internal DIL switch. To access the DIL switch, please remove the screw
terminal connectors and the backplane. Then pull the print to the rear to remove the PCB from the
housing.
ON DIP
DIL-Switch
Removal of the back plane
Location of the DIL switch
RS232:
ON
8
9
10
RxD
TxD
GND
RS485:
ON
8
9
10
A (+)
B (-)
GND
 Never set DIL switch positions 1 and 2 or DIL switch positions 3 and 4 to ON at
the same time!
 After setting the switch, shift the print carefully back to the housing, in order to
avoid damage of the front pins for connection with the front plate.