ICS Tunnel Master Jr. User Manual page 26

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Jumper
Default Setting
J1
N/A
J2
ON
J3
485
J4
485
J5
ON
J6
485
J7
OFF
J8
ON
J9
ON
J10
ON
J11
ON
Table 2-3. Jumper Settings
Page 22 -
Tunnel Master® Jr. User Manual
Not in use.
BIAS High (+) set ON for the Main Relay box only.
3 position jumper should be on 2-pins to select 485 Communication (Up).
3 position jumper should be on 2-pins to select 485 Communication (Up).
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.
3 position jumper should be on 2-pins to select 485 Communication (Left).
Receive terminating resister.
Network Interface Chassis Ground Jumper.
Network Interface Signal Ground Jumper.
BIAS Low (-) set ON for the Main Relay box only.
ON=Enables, OFF=Disables manual override switches on relay box.
Function
Chapter 2: Hardware Installation

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