E F Johnson Company 2425M80 Benutzerhandbuch

Draft 02 - Sep 1 2015

2-3

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. 

Speaker - An internal 16-ohm, 5-watt speaker is located behind the grille. An optional 4-
ohm, 12-watt external speaker may be used if desired. The internal speaker should be 
disabled when an external speaker is used.

Figure 2.3 shows the front panel display.

Front Panel Display

Alphanumeric Display - This ten-character area of the display indicates the alias (unique 
identification) for the selected zone, channel or combined aliases, depending on which 
select mode is active. It may also indicate such things as the channel frequency, ID 
numbers, and status and error messages.

10 - Character Alphanumeric Display

Zone

Number

Status

Display

Channel

Number

Operating Mode 

Symbols

Zone/Channel Select Indicators