Dry Contact Alarm Relay (Dcar); System Start Up - TC Communications TC1920 User Manual

Chapter 2 Installation
2.4

Dry Contact Alarm Relay (DCAR)

A terminal block connector at the rear panel provides for the Dry Contact
Alarm Relay. This relay can be used in NO (Normal Open) or NC (Normal
Close) configuration.
When used in NO (Normal Open) configuration, the relay will close if the unit
loses power completely or the Alarm is on. The relay remains open during
normal operation.
When used in NC (Normal Close) configuration, the relay will open if the unit
loses power completely or the Alarm is on. The relay remains close during
normal operation.
2.5

System Start Up

Apply the power by plugging the power plug into a power jack (both PWR A
& PWR B for dual power units).
After power is applied, all LEDs (except PWR & VCC LEDs) will flash
momentarily and the following LED status should be observed from the front
and back panels:
1. The Power "A" and/or "B" and VCC LEDs should be lit.
2. The "FXS" LED will be solid on.
3. The "LINK" LED of the Ethernet ports on the back panel will be on or
flashing indicating that the Ethernet connection is established. This is
normal when an Ethernet cable is connected to an Ethernet port.
2-2
Dry Contact Alarm Relay (DCAR)
TC1920 Rev 1.3 User Manual