E F Johnson Company 2425M80 Benutzerhandbuch

Draft 02 - Sep 1 2015

5-8

This feature is available on conventional channels only. 

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 (or 
menu selection) is required for these functions. Emergency Alarms and Calls are 
transmitted on the global (radio wide) emergency zone/channel if one is programmed and 
a smart console with message receiving capabilities is used. 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.

The user can set an external line by pressing the emergency button. External devices can 
trigger off of the radio’s external line. If the “Ext Emergency” Option is enabled by 
programming and the user presses the emergency button, the Aux B line on the accessory 
connect shall be set to low (0V). It remains low until the External Emergency Time has 
passed or the user exits the emergency. If the user presses emergency during the External 
Emergency Time, the timer starts over. If the user exits emergency before the External 
Emergency Time has passed, the output line returns to Vbatt. 

An emergency alarm is a special transmission that alerts a dispatcher of an emergency 
situation. It is sent automatically by 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. Emergency alarms and calls can be received on 
smart consoles with message receiving capabilities.

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. Refer to Section 5.12.5 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 Emergency 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 “EMERGENCY” flashes in the display. 
This indication continues to flash until the alarm mode is ended (see Step 4).