Specifications

i50 Manual (5.10)

Page 53

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13.4 Alarm Mode

When an input is configured as an “Alert Input”, it can be used to test the system, and trigger alarms.

It should be connected to a switch or push button (configured as active low with the other side of the

switch connected to ground). To monitor the i50 alarm mode, one digital output should be configured

as an "Alert Output". This output is designed to drive a buzzer or siren (configured as active low with

the other side of the buzzer connected to the positive supply). Note: the i50 will not enter sleep mode

while an alarm is active.

13.4.1 Alarm Input

Pressing the alarm button performs these functions:

1 push: Network test. Alert output will beep 3 times if no network, otherwise the i50 will

wait for a server ACK then beep once. If there is no response from the server after

3 minutes, the test will be cancelled and the alarm output will beep 3 times.

2 pushes: Silence alert output when in alarm mode (unit stays in alarm mode).

3 pushes: Panic alarm. Triggers a high priority alarm and turns on alert output. Note: this

state is also triggered when a Grace pager alert is received. The alarm must be

cancelled before another alarm can be sent. Even if a server ACK is received,

alarms will be resent every 5 min until a DataHost responds.

4 pushes: Cancel alarm (only works after alarm has been silenced).

Hold for 5 sec: Diagnostic test. Checks GPS, network, and pager receiver. The Alert output will

beep to indicate the result (see below).

Note: any changes on the alarm input will force the i50 to wake up immediately if it is currently in

sleep mode.

13.4.2 Alarm Output

The Alert output beeps as follows:

1 beep: ACK. Occurs when a network or diagnostic test is started or a user

cancels alarm.

2 beeps: Server ACK. Indicates server ACK has been received for a network test.

3 beeps: No Network. Indicates no network available during alarm or diagnostic

test.

4 beeps: Cancel ACK. Occurs when server ACKs a cancel alarm event.

5 beeps: Pager receiver not found during a diagnostic test.

6 beeps: No GPS signal available during diagnostic test.

On continuously: Alarm triggered but no ACK received (this can be a pager or panic

button alarm).

2 sec pulses every 3 sec: Alarm ACK received from DataHost user. Alarm output will turn back on

in this mode when ACK is received and output has previously been

silenced (to indicate state change).