User Manual—Version 3.0 Tunnel Master
Jr. System Hardware and Installation
January 2016 39
Table 1: Relay Box Circuit Descriptions
Jumper Setting Function
J1 N/A Does not exist.
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.
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