 The Electric Power Modem |
Introduction |
The electric power modem is a very
common used communication device in electric power automatic
system, mainly used in transform station distributed control
system, electric power bureau, dispatch center, front-end
computer¡¯s data communication, as well as widely used
in petroleum, metallurgy, environmental protection and
other fields which are in need of SCADA distributed data
acquisition, remote control, remote communication system.
SMM modem driver is a multi-function modem driver which
suits to data transmission of dispatch automation in electric
power system. It applies to the synchronous or asynchronous
data transmission on the electric power carrier wave channel,
microwave channel, optical channel, lightning on communication
cable and specialized channel. This modem driver adopts
FSK digital modem way and the newest modem driving technique,
thus leads more perfect function, more flexible usage,
stronger adaptation, and higher stability and reliability.
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Features |
Uses the advanced industrial STC80C51 one-chip computer;
stability and optimization.
High electromagnetic compatibility design; conforms to
international related standard, and good anti-interference
ability.
Uses surface mounting technique and highly conglomerated
circuit board, can avoid communication breakdown caused
by connection.
Among the input and output port (as well as the signal
place) can get driving and electronic isolation by optocoupler.
Has the signal light display for signal receiving and
carrier wave inspection indicative status;
Complete metal cabinet, industrial design, artistic modeling,
and convenient screen combination;
Reliable product quality, small volume, and convenient
design;
With card model (may share the smc2000 cabinet with SMC
serial power modem driver.
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Parameter |
| System
index |
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Work
environment requirement |
- Modem way: uses frequency shift keying modem
way( 2FSK), continuous phase
Transfer speed: 300¡¢600¡¢1200 bit/S (activated)
Communication way: includes BELL(103¡¢202)¡¢CCITT(V23¡¢V21)¡¢multiplexing
in power line carrier channel audio and other
communication ways.
Transfer way: synchronous or asynchronous
Working way: adopts four-line full-duplex- communication way.
output resistance: 600
Receiving: active-standby channel automatic
switch, resistance is balance 600¦¸
Transfer route: special line, telephone line,
microwave, carrier wave, frequency expand, optical
voice channel.
Port standard: RS232C
Transfer Level: 0 ~ -20 dB continual adjustable
Receiving level: 0 ~ -40 dB /600¦¸
Frequency offset: dispatch modem port¡Ü¡À2 Hz
Receiving driving port offset adaptability ¡Ü
¡À20Hz
Signal-to-noise ratio: in center the frequency
is 3000+/-200HZ, transfer speed rate is 600bit/S
each hour; if occurs the worst signal-to-noise
ratio : -5dB , the 511 pseudorandom code¡¯s bit
error ratio should not surpass 1*10-5
RTS-CTS contact response-time: 27ms
Signal receiving text time: 25ms
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- Environment temperature: -10¡æ~+50¡æ£¬the average
temperature can not surpass +35¡æ in 24 hours;
Storing temperature: -10 ¡æ ~+70 ¡æ, no addition
to the drive quantity under the limit value,
no irreversible conversion to the device, after
the temperature resuming, the device can work
normally;
Relative humidity: less than 85
Air pressure: 80 kPa ~110kPa
Working place: deviate the datum location less
than 5
There should not be explosive medium, either
the gas which can corrode the metal and destroy
the insulation or conductive media; can not
fill with vapor and exist serious mold;
The application place must have the facilities
to defend rain ,snow ,wind, sand and dusty.
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SMC2000 serial intelligent channel switcher includes
two models: table and card. During the practical application,
according to the scene real need, combines with SND200 serial
power modem driver, can realize the function of data and simulation
signal¡¯s switch, active-standby channel¡¯s redundancy judgment.
What¡¯s more, according to user¡¯s special technique requirement,
design and configure the product. |
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