GAI-Tronics 379-001 Monitored Relay Module (MRM) Station - Manual (Page 8)

Pub. 42004-714L2C
Model 379-001 Monitored Relay Module Station Page: 8 of 9
f:\standard ioms - current release\42004 instr. manuals\42004-714l2c.doc
08/11
Mode 5: IDC Non-Supervision Multiple Switch (Voltage-free Contact)
In this mode, any number of normally open dry contact closures can be installed on the line. No end-of-
line resistors are installed. The cable loop is not monitored for any faults.
Figure 7. Non-Supervision Multiple Switches
When the contact is open the circuit is inactive, and when the contact is closed, the circuit is active.
Mode 5: IDC Non-Supervision (24 V DC)
In this mode, a 24 V dc voltage source can be installed on the line. No end-of-line resistors are installed.
The cable loop is not monitored for any faults.
Shorting jumpers (located next to the input terminals) must be moved from the factory default of “dry” to
“wet” contact mode.
When set to “wet” contact mode, the input can be activated during a 0 V condition or a 24 V condition
depending on the “active” jumper position. The factory default setting is “24 V dc input when active”
(position 2-3). If “0 V dc input when active” is desired, move jumper from position 2-3 to position 1-2.
Ensure the polarity of input connection is correct as it is polarity sensitive.
Figure 8. Non-Supervision (wet contact)