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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)： | 5/24頁 |
| 文件大?。?/td> | 162K |
| 代理商： | CM1481 |
5
Installation ......
Pin
Function
Normal Mode - to Radio
Function
Configure Mode - to PC
1
CONFIG
Configuration mode sense. When this pin is “High” the module WILL NOT enter the
CONFIGURATION
mode, when “Low” the module WILL enter the
CONFIGURATION
mode on power-up.
2
*
BUSY
Input from the radio squelch circuitry. A level here
indicates the presence of an RF carrier.
3
*
Tx CALL
Input from the installation “Operation” momentary-
action switch to initiate a Selcall.
See "Single/Dual Button" Operation notes.
4
*
QUIET/OPEN
Input from the installation “Operation” momentary-
action switch to control the radio mute state.
See "Single/Dual Button" Operation notes.
5
*
PTT IN
Input from the Mic. or peripheral PTT line.
The CM1481 controls the radio Tx function via
Tx On.
6
SIGNAL IN
Input for received Selcall tones from the radio
demodulator prior to squelch circuitry.
7
ALERT
Audible alerts output. Introduce into the radio's Rx
audio stage with due regard to any audio powersave
functions. This output can drive a loudspeaker directly.
8
*
LED
Output drive to an LED indicator.
Connect an LED between this pin and GND.
9
TONE OUT
Selcall tone output. Introduce this output into the
radio Tx Audio path.
10
*
MUTE CTRL
Connect to radio Rx Squelch circuitry so that when
this output is active Rx Audio is muted.
11
*
Tx ON
Tx PTT Drive. When active this output will key the Tx.
12
GND
Signal Ground (-)
13
V IN
Positive Supply Voltage (+)
The position of Pin 1 is identified on Figure 4 (PCB Layout).
AUDIO SWITCH
An on-board (Audio Signalling Processor) all-audio switch-path, accessible via on-board
solder-pads. This switch operates in co-ordination with the QUIET/OPEN function for use with all audio
signals. When 'Quiet' the switch is OFF, when 'Open' the switch is ON.
Tabe 1 CM1481 Rado Interface Functons
CLOCK
The CLOCK signal generated by
the configuring PC is input here.
DATA IN
Data from the configuring PC to the
module is input here.
DATA OUT Data from the module to the
configuring PC is output here.
CM1481 Radio Interface
The table below shows the functions and interconnections of the CM1481 interface (J1) employed in both
NORMAL
and
CONFIGURATION
modes.
Functions prefixed by a star (
*
) indicate configurable IN/OUT polarities. Consult the Configuration section of this
manual for Configuration Instructions and Configuration Interface Connector termination information.
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