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Connecting an MX2020 Router to an External Alarm-Reporting Device

To connect the router to external alarm-reporting devices, attach wires to the RED and YELLOW relay contacts on the craft interface, (see Figure 1). A system condition that triggers the red or yellow alarm LED on the craft interface also activates the corresponding alarm relay contact.

The terminal blocks that plug into the alarm relay contacts are supplied with the router, (see Table 1). They accept wire of any gauge between 28 AWG and 14 AWG (0.08 and 2.08 mm2); the wire which is not provided. Use the gauge of wire appropriate for the external device you are connecting.

To connect an external device to an alarm relay contact (see Figure 1).

  1. Prepare the required length of wire with gauge between 28 AWG and 14 AWG (0.08 and 2.08 mm2).
  2. While the terminal block is not plugged into the relay contact, use a 2.5 mm flat-blade screwdriver to loosen the small screws. With the small screws facing left, insert wires into the slots in the front of the block based on the wiring for the external device. Tighten the screws to secure the wire.
  3. Plug the terminal block into the relay contact, and use a 2.5 mm flat-blade screwdriver to tighten the screws on the face of the block.
  4. Attach the other end of the wires to the external device.

To attach a reporting device for the other kind of alarm, repeat the procedure.

Figure 1: Alarm Relay ContactsAlarm Relay Contacts
Table 1: Alarm Relay Contacts

Function No.






The alarm relays consist of three terminal contacts with a normal closed (NC), common (C), and normal open (NO) relays that signal a minor or major alarm when broken.