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參數(shù)資料
| 型號： | CM1481 |
| 英文描述： | Non-Predictive Selcall Module |
| 中文描述： | 非預(yù)測Selcall模塊 |
| 文件頁數(shù)： | 15/24頁 |
| 文件大?。?/td> | 162K |
| 代理商： | CM1481 |
15
Functional Descriptions ......
Input/Output
Polarities
Function
PTT In
Tx On
Busy
Mute Ctrl
LED
Quiet/Open
Tx Call
Notes
Input
Output
Input
Output
Output
Input
Input
On-Board State
Pullup to V
DD
Connected To
- the microphone end of the radio PTT line
- the PTT line to the Tx circuitry
- Rx carrier detect circuitry
- to operate the radio squelch gate
- to drive an LED to provide a visual alert
- to control the radio mute state
- Selcall initiation
Pullup to V
DD
Pullup to V
DD
Pullup to V
DD
Table 6 Input/Output Programmable Polarities
The following input and output activation polarities may be set at configuration.
Tx Timeout
and
Warning
To prevent nuisance and to regulate transmissions to a reasonable period, the PTT
Timeout function will disable all PTT Tx functions after a pre-determined (configured) time
period.
When the PTT is activated the PTT Timer will run for the configured interval giving an
Audible Warning
6-seconds before the timeout. If the PTT is still active 6-seconds after
the warning the transmission will be aborted at that time and all PTT functions completely
disabled for a short period (6-seconds) to enable other users the opportunity to enter the
channel.
Although not recommended, if the the PTT is released and re-keyed frequently before the
PTT Timeout Warning, the PTT Timer will be reset and the Tx Timeout will not be
activated
Under Tx Timeout conditions, the PTT must be released and will not be re-enabled for a
predetermined period. The PTT Timeout period can be configured to OFF.
Configured as PTT Time-Out:
N
OTONE
Timer
A configurable function incorporated to indicate the end of a tone or tone sequence to the
on-board μController. For optimum CM1481 performance it is recommended that this
function be set to approximately 1.5 times the selected Tone Length.
Configured as N
OTONE
Timer:
Recommended N
OTONES
Toneset
EEA
CCIR
ZVEI
Tone Length
40ms
100ms
70ms
N
OTONE
Period
60ms
160ms
100ms
Transpond-
ing
In reply to a Selcall the CM1481 can be configured to respond by transmitting either its
Transpond Address (Tp) or a BEEP (tone F). This function can be re-configured over-air.
Configured as Transpond Mode: and Transpond Address:
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