E F Johnson Company 2425372 Benutzerhandbuch

Emergency Alarms and Calls are separate functions that can be individually enabled or 
disabled on each analog and P25 conventional system. The Emergency option switch is 
required for these functions. Emergency Alarms and Calls are transmitted on the global 
(radio wide) emergency zone/channel if one is programmed. If it is not programmed, the 
emergency is transmitted on the selected channel. The emergency programming of the 
system to which that channel is linked controls the emergency operation.

An emergency alarm is a special transmission that alerts a dispatcher of an emergency 
situation. It is sent automatically by simply pressing Emergency option switch. The 
system to which the emergency channel is linked must have Emergency Alarms enabled. 
If it does not, Emergency Alarms are disabled.

In the P25 conventional mode, a special P25 emergency data transmission is sent, and in 
the conventional analog mode, an DTMF emergency ID is sent. This ID is programmed on 
the Conventional Radio Wide screen. Refer to Section 5.14 for information on the 
MDC1200 Emergency Alert.

Proceed as follows to send an emergency alarm:

1 If required, select a channel of a system on which Emergency Alarms are enabled and 

then press the EMER option switch. The radio then automatically transmits the 
emergency alarm.

2 Either Normal or Silent operation can be programmed. With the Normal mode, the red 

LED lights, the emergency tone sounds, and “EMERGNCY” flashes in the display. 
This indication continues to flash until the alarm mode is ended (see step 4).

If silent programmed or the Surveillance mode is selected (see Section 4.9), none of 
these indications occur. If “No Receive Activity During Emergency” is programmed, 
receive audio, the front panel LED, and receive icons are disabled in the receive mode.

3 When the emergency alarm is acknowledged by the dispatcher, “ACK RCVD” is 

briefly displayed and the emergency acknowledge tone (two beeps) sounds. This alert 
tone can be disabled if desired, and neither occur if Silent operation is programmed.

4 The emergency alarm mode is exited when radio power is cycled or by pressing and 

holding the Emergency option switch.