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Tunnel Master® Jr. User Manual
Chapter 2: Hardware Installation
Jumper
Default Setting
Function
J1
N/A
Not in use.
J2
ON
BIAS High (+) set ON for the Main Relay box only.
J3
485
3 position jumper should be on 2-pins to select 485 Communication (Up).
J4
485
3 position jumper should be on 2-pins to select 485 Communication (Up).
J5
ON
Transmit terminating resistor. Only ON if first or last device in network. If you have a
24-output system, this should be ON. If you have a 48-output system, the main relay
box should be OFF and the second relay box should be ON.
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.
Table 2-3.
Jumper Settings
Summary of Contents for Tunnel Master Jr
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