Special Application Inputs Connections
J5 Contact Closure Activation: An alternative to the reverse-polarity NAC activation is a supervised contact
closure input. Depending upon the position of the JP1 jumper, this can activate the system exactly the same as
the NAC input. Refer to the drawing in section 4.1 to see the wiring connections to J5, the Contact Closure input.
This is a Normally Open (N.O.) ‘dry contact’ input that can be from a switch, or relay with the 10K EOLR across
the terminals for the switch etc. If the NAC input cannot be monitored by an NAC or supervisory module, then
the optional external relay board can be used as a system supervisory connection. If there is nothing connected
to the J4 NAC input, then the internal trouble contact between J4 pins 1 and 4 can be monitored for a Normally
Closed (N.C.) connection of a trouble loop that will open the circuit during any MNS-100 fault condition.
Note that during AC interruption and backup battery operation, this contact has a delayed action.
J1, J6 Auxiliary Audio Inputs: To provide for a way to broadcast audio from external sources through the
Emergency Communication Speaker System, two Aux-Audio inputs are provided. Both have 1VRMS Audio
inputs and contact closure activation. They can be connected to the local telephone system via a ‘Line-Card’
provided by the phone company, a Weather Radio that will automatically activate upon severe weather
alerts or for connection to a wide area Mass Notification system.
J6 is on the lower left-hand edge of the main board. J1 is above it on the middle right edge.
On both, pins 1 and 2 are the Audio input, set standard for 1VRMS (0dBm, 2VPP) although other levels are
available. To activate these inputs, a dry-contact N.O. switch or relay is closed across pins 3 and 4. This will
set the system into Active, and the audio present at the associated input will be broadcast. This is a
secondary use of the system, and any other activation NAC, message select, local microphone, or remote
microphone will over-ride these inputs. J1 is a supervised input for use primarily in Mass Notification
systems, where these connections need to be maintained at all times. Loss of either EOLR will result in a
trouble indication.
J3 Remote Microphone Input: A Remote Microphone may be placed in a convenient location for use by
Emergency personnel, such as the front lobby.
The MNS-100 has a supervised input for the remote microphone. As shipped, there are two ‘Dummy’ EOLRs, one
attached between to J3 pins 1 and 2, and another between 3 and 4. These ‘Dummy’ EOLRs are removed and
stored upon installation of the Remote Microphone wiring.
There are 4-conductors between the MNS-100
and the Remote microphone. These are
typically 16 to 22AWG, in a single jacket, with
a length up to 200’. The cable doesn’t need to
be shielded unless it’s run in the same conduit
as the FACP- SLC, or other data lines.
The connections are pin to pin from connector to connector. Such that pin one of the MNS-100 goes to pin
1 of the Remote mic, 2 to 2, 3 to 3, and 4 to 4. The Remote Microphone Installation Instructions show this
and other information in greater detail.
