Acrosser AR-B1790 - Manual (Page 13)

AR-1790 User’s Guide
13
3.3 COM3 RS-232/RS-485 SELECT (JP19, JP20)
•
RS-485 Terminator Select (JP15)
JP15 (ON)
•
RS-485 Header (JP18)
1
2
3
JUMPER FUNCTION
JP19
1
3
5
1
2
3
JP20
RS-232
FACTORY PRESET
JP19
1
3
5
1
2
3
JP20
RS-485
PIN Signal
1 N485+
2 N485-
3 GND
FACTORY PRESET
* When there is only one line the setting should be left off (please
take off the jumper), if multiple blocks are used on a single line this
should be set to “ON”(place a jumper) in order to properly terminate
the connection for better transmission