參數(shù)資料
型號(hào)： MT8870
廠(chǎng)商： Mitel Networks Corporation
英文描述： ()
中文描述： （）
文件頁(yè)數(shù)： 14/23頁(yè)
文件大?。?/td> 177K
代理商： MT8870
MSAN-108
Application Note
A-58
Figure 15 - Distributed Control System
DTMF
SIGNAL
SOURCE
I.D. DECODE
LOGIC
DRIVER
VALVE
MT8870
DTMF
RECEIVER
I.D. DECODE
LOGIC
DRIVER
VALVE
MT8870
DTMF
RECEIVER
COMPUTER
I.D. DECODE
LOGIC
DRIVER
MT8870
DTMF
RECEIVER
SPRINKLER
ALARM
system design objective. If one DTMF code is
reserved exclusively for the ”RESET“ function then
the MT8870 outputs can be decoded directly. This
requires that the controller send a ”RESET“
command prior to sending an I.D. sequence.
Alternatively a ”time-out“ timer, triggered by StD,
could serve to generate a system reset if a certain
time lapse occurs between received signals. This
method places time constraints on the system but
eliminates the need to consume a DTMF command
for the ”RESET“ function.
The concept of using a common transmission
medium for control signalling applies to several
possible situations. Plant process control, remote
measurement
control,
systems, institutional intercom systems, two way
radio control, pocket pagers and model car or boat
remote control, just to mention a few.
selective
intercom
call
Conversely, data could be collected from distributed
sources. Implemented on a circulating wire or an RF
channel, as illustrated in Figure 17, information could
be collected by a central unit which individually polls
each monitor to ask for data. Alternatively, the
system could be interrupt driven (Fig.18). In this
case each monitor, when ready to send data,
generates an interrupt request by sending a DTMF
I.D. sequence followed by a data stream. Interrupt
masking or prioritizing could be achieved from the
the central control end by applying DC levels across
a wire pair or sending a pilot tone in an RF system.
Remote data collection units would monitor this
signal to detect when a higher priority interupt is
being handled or the communications channel is
busy.
Data Communication Using DTMF
There is a vast array of potential applications for
DTMF signalling using the existing telephone
network. Considering that there are millions of
ready-made data sets installed in convenient
locations (i.e. the Touch Tone telephone) remote
control and data entry may be performed by users
without requiring them to carry around bulky data
modems.
Potential applications include:
home remote control
remote data entry from any Touch-Tone keypad
credit card verification and inquiry
salesman order entry
catalogue store (stock/price returned via voice
synthesis)
stock broker buy/sell/inquire -using stock
exchange listing mnemonics
answering machine message retrieval
automatic switchboard extension forwarding
相關(guān)PDF資料
PDF描述
MT8880C ISO2-CMOS Integrated DTMFTransceiver
MT8880CE-1 ISO2-CMOS Integrated DTMFTransceiver
MT8880CC ISO2-CMOS Integrated DTMFTransceiver
MT8880CE ISO2-CMOS Integrated DTMFTransceiver
MT8880CN ISO2-CMOS Integrated DTMFTransceiver
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MT8870BE 制造商:Panasonic Industrial Company 功能描述:RECEIVER
MT8870D 制造商:MITEL 制造商全稱(chēng):Mitel Networks Corporation 功能描述:ISO2-CMOS Integrated DTMF Receiver
MT8870DC 制造商:MITEL 制造商全稱(chēng):Mitel Networks Corporation 功能描述:ISO2-CMOS Integrated DTMF Receiver
MT8870DC-1 制造商:MITEL 制造商全稱(chēng):Mitel Networks Corporation 功能描述:ISO2-CMOS Integrated DTMF Receiver
MT8870DE 制造商:Microsemi Corporation 功能描述:
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