TUNNEL MASTER JR MANUAL
System Hardware
19
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,
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