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參數(shù)資料
| 型號(hào)： | CM1481 |
| 英文描述： | Non-Predictive Selcall Module |
| 中文描述： | 非預(yù)測(cè)Selcall模塊 |
| 文件頁(yè)數(shù)： | 12/24頁(yè) |
| 文件大?。?/td> | 162K |
| 代理商： | CM1481 |
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12
Receive Call
Operation
Functional Descriptions
Individual Selcall Receive Sequence
GROUP Selcall Receive Sequence
Unit’s Rx Selcall Address is decoded
A GROUP-call with the unit’s Rx Selcall
Address is decoded
Alert cancelled by ’blip’ of PTT, Call
or Quiet/Open buttons, or Time-Out
Radio is muted by: push-button/Timed Mute Reset
/Remote Reset
Radio is Closed by: push-button/Timed Mute Reset
/Remote Reset
Conversation takes place; Conversation complete
The calling party transmits the message/s
T
he CM1481 can only reply to an originator whose Tx Address is
configured, and not to the other GROUP members
-
Convers
at
ion complete.
i
ii
iii
If Transpond configured the unit transponds
Audio Open; "Open" Alert is output
"Call Received" Alert is output; LED output is pulsed
i
ii
No transpond can take place for a GROUP-Call
"GROUP-Call" Alert is output; this alert is self cancelling
i
Alert beeps stop
i Unit "Closed" Alert is output.
Radio is Closed.
i Unit "Closed" Alert is output.
Radio is Closed.
Fig.5 Rx Call Operation
Normall Selcall Transmit Sequence
Unmute the radio by push-button operation -
(see Single/DualButton operation)
- or employ ’Muted Call’ initiation Method
Transmit the (Tx Address) Selcall by push-button
operation
Note that if the BUSY input is active, a call
cannot be transmitted (PTT Lockout)
Radio is Closed by: push-button/Timed Mute Reset
/Remote Reset
Start Conversation
Monitor the channel.
Conversation complete
A
B
If the system is ’No Transpond’, when the called station’s reply is received the converstaion may continue.
If the system is ’Transpond’, await the transpond action then conversation may continue.
i
ii
Unit "Open" Alert is output.
Radio squelch circuitry released to normal operation
i
ii
"Call Transmitted" Alert is output
Tx ON is active; the Selcall is output at TONE OUT
i Unit "Closed" Alert is output.
Radio is Closed.
i
PTT Timer started
Transmit Call
Operation
LED Call
Memory
If the ‘Selcall Received Alert’ has been activated but not cancelled, the module can be
configured so as to leave the LED illuminated as a Call Memory.
The use of any push-button function will cancel this LED action.
Configured as LED Call Memory:
LED Drive
A polarity programmable LED drive output is available if a visual indication of a received
Selcall is required. It is recommended that, under LED conditions, this output is configured
as an “active high” and an external LED is connected directly to GND (0V).
With due regard to the specified current limits, this output may be used to activate mobile
horn-honk/indicator driver circuits.
Fig.6 Tx Call Operation
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