E F Johnson Company 2425372 사용자 설명서

The radio can be installed so that the vehicle ignition switch as well as the front panel 
power switch of the radio control power. This is done by connecting the accessory cable 
ignition switch input to the vehicle ignition switch. Refer to the Installation section of the 
5300 ES Service Manual for more information. A power-off delay of up to 254 minutes 
can then be programmed or this feature can be disabled by programming “Forever” so 
there is no automatic power off.

Both the ignition switch and the power switch must then be on for radio power to turn on. 
The delay can be overridden at any time by turning power off using the front panel power 
switch or turning the ignition switch back on.

This turn-off delay can allow calls to be received or the horn alert to be active for a time 
after the ignition switch is turned off. At the same time, advantages of ignition switch 
control are utilized such as preventing the battery discharge that may occur if the radio is 
left on for an extended period (see Section 7.6).

The horn alert feature sounds an external alert such as the vehicle horn when certain calls 
are received. It is available if a Horn option switch is programmed and the proper 
connection has been made to the external alert. The horn alert output is pin 4 of the 
accessory cable, and an external driver circuit of some type is usually required. Refer to 
the Installation section of the 5300 ES Service Manual for more information on how to 
install this feature.

Additional information on the horn alert feature follows:

• It activates when receiving any Unit call in the P25 conventional mode and any Private/

Unit and Call Alert (paging) call in the SMARTNET/SmartZone and P25 Trunked 
modes. It does not sound when receiving standard Group or telephone calls, and is not 
programmable on a per call basis.

• It must be manually enabled and disabled by the Horn option switch. It is not controlled 

by the vehicle ignition switch. When it is enabled, “HORN ON” is briefly displayed, 
and when it is disabled, “HORN OFF” is briefly displayed. It defaults to the off mode 
whenever power is turned on.

• If a power turn-off delay is programmed as just described, it is functional during that 

delay.

• When activated, it can be programmed to sound for three 1-second beeps or 

continuously for 2-90 seconds. It then turns off until another Unit call is received.