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J6
485
3 position jumper should be on 2 pins to select 485 Communication
(Left)
J7
OFF
Receive terminating resister.
J8
ON
Network Interface Chassis Ground Jumper
J9
ON
Network Interface Signal Ground Jumper
J10
ON
BIAS Low (-) set ON for the Main Relay box only.
J11
ON
ON = Enables, OFF = Disables manual override switches on relay
box,
System Hardware
TUNNEL MASTER JR MANUAL
19
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