ICS Tunnel Master Jr. User Manual page 26

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