E.F. Johnson Company 53SL ES Series, Руководство по эксплуатации

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6-18 53SL ES Series Mobile Radio Operating Manual April 2009
Project 25 Mode Features Section 6 - Conventional Mode Features
that option is enabled). If talkgroup selection has been disabled on the channel by
programming, the talkgroup does not change, “NO LIST” is displayed, and a tone
sounds.
6.13.7 P25 Unit Calls
Unit calls (also called Individual Calls) can be placed to a specific radio on Project 25
channels using the Unit
Call
option switch (if programmed) or by menu selection. Only the
individual ID of the target radio is sent (a talkgroup ID is not sent). The mobiles that can
be called are preprogrammed in the Unit Call list.
To receive a unit call, the RF channel of the call must be selected or scanned and the
correct NAC and unit ID must be detected. The ID of the calling radio is then transmitted
back. To respond to the call, the radio must be programmed with the Unit
Call
option
switch, and have a Unit Call programmed with the ID of the calling mobile.
Place and receive a Unit Call as follows:
1 To transmit a unit call, press the Unit
Call
option switch (or select the menu option). The
alias (tag) of the last Unit Call is displayed.
2
If required, rotate the Select switch to display the desired alias/ID. The alias and ID of
the unit calls that have been programmed are alternately displayed.
3 Press and then release the PTT switch. Ringing is then heard and “WAIT” displayed to
indicate that the mobile is being rung. To disable this ringing but not the call, briefly
press the PTT switch again. Ringing occurs for 20 seconds or until the call is answered,
whichever occurs first.
4
When a unit ID call is received, two beeps sound (if tones are enabled), and “CALL
RCVD” and the alias of the Unit ID are alternately flashed.
5 To respond, select the Unit Call mode by pressing the Unit Call option key.
- If the call timer times out (set by programming) or the channel is changed before a
response is made, the unit call mode is exited.
6.13.8 P25 Conventional Telephone Calls
Telephone calls can be placed and received on P25 conventional channels. Telephone calls
to be placed and received over the public telephone system using your radio require a
Network Interface Unit (NIU). Telephone calls are programmed to operate in one of the
following modes:
• Disabled
• Answer-only capability