Digi SM-720 - RS485 Loop Back Test

SM720 Service Manual Edition 5
40
5.2.1.3 RS485 Loop Back Test
Connect RS-485 Loop Back jig to scale.
Procedure Picture
1) In [Operation Menu] mode, press and hold [Re-zero] and press
[0] [8] [9] [3] to go to [Maintenance Screen].
2) Touch [Self Diagnostic] to go to self diagnostic mode.
3) Touch [4L MULTI-DROP].
4) Ensure the testing result is successful.
1
6
TEST JIG CONNECTOR for 4 LINE RS485 Port
Connect pin 1 and pin 3
Connect pin 2 and pin 4
Test Ok
Test Fail