1. backgrounds
Some is engaged in the satellite communication service
the company to have to set up through Beijing Kunlun Mountains passing
condition MCGS configuration software to be many by one (master
station) (from stands) the pattern long-distance monitoring network,
uses in to monitor various satellites to launch the mechanic to do a
favor the situation. Various transmitters signal through Kang
Tuoban card gathering, the use grinds overseas Chinese laborer
controlling machine to take from the station, software uses the MCGS
general version (to insert version), has fixed IP the server to take
the master station, software uses the MCGS network version.
Digit dialing and connects from the station with fine duplicate
joyful GF-2000W wireless GPRS the Modem through the GPRS network on
Internet the master station communication and the transmission data.
May as necessary digit dialing accesses the net from the station
through MCGS and fine duplicate joyful GF-2000W wireless GPRS the
Modem with the master station establishment appoints to the
transmission data TCP/IP link, examines own the real-time data or the
history data transfer master station, the master station also may
revise through this TCP/IP link transmission order from stands the
MCGS variable value, achieved carries on the simple control to the
scene equipment the function.
Regarding the GPRS network, the Internet, the TCP/IP link the
TCP/IP link severance which appeared in the data communication
process, the communication overtime, the network connection severance
ç‰å¼‚ often in the situation MCGS software driver all has carried on
corresponding processing. Enables the data communication which
exceptionally severs the self-recovery to the normal communication
condition.
2. GPRS synopsis
GPRS is the general grouping wireless service (General
Packet Radio Service) English abbreviation, is one kind of new bearer
service which develops on the existing GSM system, the goal is the GSM
user provides the grouping form the data service. GPRS uses with
the GSM similar wireless modulation standard, the similar frequency
band, same arise suddenly the structure, the similar frequency-hopping
regular as well as the same TDMA frame structure, this kind of new
packet data channel and the current electric circuit exchange the
voice feature channel is extremely similar. Therefore, the
existing base station subsystem (BSS) from as soon as starts to be
possible to provide the comprehensive GPRS cover. GPRS
permission user under end-to-end grouping shift pattern transmission
and receive data, but does not need to use the electric circuit
exchange pattern the network resources. Thus has highly
effective provided one kind highly effective, the low cost wireless
integrated data service. Specially is suitable for interrupted,
burst characteristics and is frequent, the few data transmission, also
is suitable for the occasionally great data quantity transmission.
The GPRS theory band width may reach 171.2Kb/s, the practical
application band width approximately in 10~70Kb/s, provides the TCP/IP
connection on this channel, may use in application and so on INTERNET
connection, data transmission.
GPRS is one kind of new migration data communication service,
provides one kind of connection in the mobile subscriber and between
the data network, provides high speed wireless IP to the mobile
subscriber. GPRS uses the grouping exchange technology, each
user may simultaneously take many wireless channels, the identical
wireless channel may by many users sharing, the resources by the
effective use, the data transmission speed reach as high as 160Kbps.
Uses the GPRS technology realization data grouping to transmit
and to receive, the user forever on-line also costs according to the
current capacity, rapidly reduced the service cost. The GPRS
migration data transmission system has the very big application scope,
the nearly all center low gear rates data transmission service all may
apply, like the city power distribution network automation, the
running water, the gas piping automation, commercial POS machine,
INTERNET turn on, individual information, the stock information, the
finance, the transportation, the public security and so on.
3. plans choices
After the comparative analysis, chooses the GPRS system
which China moves to take the satellite transmitter supervisory system
the data communication platform. At present, the GSM network
after telecommunication department's many years construction, the
cover scope unceasingly expands, has maturely become maturely, stable,
the reliable correspondence network, specially China moves the GPRS
data service which newly promotes. The GSM/GPRS system may
provide the macrozonality the wireless IP connection. Constructs
the satellite transmitter supervisory system in the mobile
communication company's GPRS service platform, realizes the pipe
network 监控�wireless data transmission to have may fully use the
existing network, reduces the construction cycle, reduces the
construction cost the merit, moreover the equipment setup convenient,
the maintenance is simple.
The GPRS wireless supervisory system has following
characteristic:
1st, good real-time response and handling ability.
Compares with the short news service, because GPRS has the
real-time on-line characteristic, the system does not have when
extends, the system can simultaneously real-time gather, process
many/all test points each kind of data, does not need the wheel to
patrol may the synchronized test point clock be possible the very good
satisfied system logarithm according to gathering and the transmission
timely request.
2nd, long-distance instrumentation equipment control:
Because uses the GPRS two-way transmission system, the
monitoring center may reverse realize to the instrumentation equipment
time adjusts, function and so on condition report, switch and all that
monitor, control;
3rd, construction cost low: But fully uses the existing
GSM network, the equipment setup namely puts through, when uses the
ultra-short wave communication needs fully to consider the scene
environment, but also needs to provide the antenna iron stand and so
on the appurtenance.
4th, installs the debugging to be simple, construction cycle
short: Uses the existing mature GSM network, when the system
investment movement basic does not need to debug, the installment is
simple and direct. Uses when the ultra-short wave communication
installs the debugging work load to be big, must first carry on the
scene signal test, the antenna iron stand erects, work and so on
antenna direction angle debugging.
4. systems characteristics
1st, the cover scope is broad. Constructs the
satellite transmitter supervisory system request data communication
cover scope to be broad, expands accommodates unlimitedly, turns on
the place unlimitedly, can satisfy the mountainous area, the villages
and towns and the cross area turns on the demand.
Because pipe network 监控�quantity multitudinous, the pipe
network 监控�distributes in wide range is located the remote
area, moreover the geographical position is dispersible. Selects
the ultrashort wave communication method, the cover scope only has
more than 30 kilometers; But selects the GPRS method,
theoretically in the wireless GSM/GPRS network cover scope, all may
realize the monitoring.
2nd, the data transmission speed is high. The GPRS network
transmission speed theoretically may reach 171.2kbit/s, practical
application 时数 according to the transmission speed about 40Kbps,
but the present common ultrashort wave number passes on the
broadcasting station to transmit fast 率多 is 2.4kbit/s or is lower.
3rd, the system transmission capacity is big. Monitors the
central station to have with each pipe network 监控�realization
real-time connection. Because the pipe network 监控�
quantity is multitudinous, the system request can satisfy the burst
characteristics data transmission the need, but the GPRS technology
can satisfy the transmission burst characteristics data well the need.
4th, the correspondence expense is low. Because GPRS
selects the method which hires by the month costs, the operation
maintenance cost is low, month correspondence expense in 200 Yuan.
Five. Equipment synopsis
Fine duplicate joyful GF-2000W wireless GPRS Modem
introduction
Equipment model: GF-2000W (outside sets at
wireless modem)
Production merchant: Beijing fine duplicate joyful
science and technology limited company
Correlation data: The GF-2000W hardware connection
handbook, the product instruction for use, the user guide,
mc39i_atc_v0102.pdf (the AT instruction shows)
The system uses GAREFOWL the series GPRS wireless
transparent data transmission terminal. Product GPRS network
which moves based on China, has the high performance, high reliable
and the antijamming ability is strong and so on the characteristic,
provides the standard 232 data mouths to be possible directly with
connection and so on computer, RTU, PLC, GPS receiver, digital camera,
data terminal, the transmission speed to reach 171Kbps, has the
long-distance diagnosis, the test, the supervising and managing
function between, satisfies various professions dispatch or the
control center and the multitudinous far-end stands the data
acquisition and the control.
1st, supports 900/1,800/1900MHz three frequencies GSM/GPRS.
2nd, connection: RS232, RS485, RS422.
3rd, system theory transmission speed 171Kbps, actually
transmits speed 40Kbps.
4th, supports Windows95/98/200/XP, the LINUX operating system.
5th, support transparent data transmission and agreement
transformation.
6th, supports the VPN security function.
7th, the installment nimble, the easy to operate, is reliable.
MCGS configuration software
The Beijing Kunlun Mountains passing condition
automation software science and technology limited company is a
domestic well-known high tech enterprise, the company mainly is
engaged in specialized automated software the development, the
application system integration, and provides to the user from the
hardware to the software system design plan. The product
proliferates the petroleum, the chemical industry, the metallurgy, the
mine, the transportation, the machinery, food and so on several dozens
professions, and using controls the scene to national and even the
world multitudinous industry.
6. GF-2000W GPRS use
A, GF-2000W GPRS Modem in the installation process the
matters needing attention:
In installs GF-2000W GPRS Modem in the process to have to pay
attention, only if uses Simens (MC35) the special-purpose
communication string mouth line, otherwise best can the GPRS string
mouth line directly with the PC string mouth connected, like this can
guarantee GF-2000W GPRS Modem can obtain the enough signal strength,
the guarantee digit dialing is successful.
B, GF-2000W GPRS Modem accesses the net the establishment
process:
1, installs GF-2000W GPRS Modem
Carries on the establishment according to the below
order to GF-2000W GPRS Modem
The control panel - > the telephone and the modem option
- > the modem - > chooses increases - > does not examine the modem - >
the standard 19200bps modem - > to designate which string mouth
installs
2, establishes 19,200 modems
The supposition 19,200 modems are installed COM1
The control panel - > the telephone and the modem option
- > the modem - > the attribute - > the convention - > the string
mouth 1 - > the maximum speed (57,600) - > is high-level - > the extra
initialization order:
Orders in a fence in the extra initialization to fill in:
AT+CGDCONT=1, ip, CMNET
Finally: Completes after the establishment enters
The control panel - > the telephone and the modem option
- > the modem - > the attribute - > diagnoses - > inquires the modem
May inquire GF-2000W GPRS Modem according to the above
step whether correctly installs.
3, establishes the digit dialing connection
The newly built connection - > the digit dialing to the
private network - > the standard 19,200 modems - > the district number
sets spatially, the telephone number fills in: *99***1#
4, establishment digit dialing connection network
attribute
Digit dialing connection - > attribute - > network
The server type chooses PPP
The connection only selects the TCP/IP agreement
The attempt lands the network:
Finished after the establishment may try to land the network,
double-clicked a moment ago the newly built digit dialing network, set
at the spatial user name and the password, carried on the digit
dialing, the PPP server can examine the user name and the password,
will register after the examination your computer, after the digit
dialing network chart æ ‡ä¼š has appeared in the WINDOWS duty fence
right under angle.
C, server/customer end pattern communication experiment (add by
xp)
Experimental environment:
Hardware:
Server: Ordinary pc + ordinary Modem, the digit dialing
accesses the net.
Customer end: Ordinary pc + GPRS Modem, in digit dialing
GPRS network.
Software:
MCGS general version: General TCPIP father equipment +
network data synchronization CE
Server: Through the Modem digit dialing or through
other way connections on Internet, has the fixed IP address.
Establishes the server in customer end software the IP address,
through Internet and server establishment connection.
Customer end: Has connected the GF-2000W GPRS Modem
computer or the equipment in this experimental middle finger.
Has installed GF-2000W GPRS Modem through the above step, after
and dialed Internet to meet in the realization data passed on (next
passes on) the communication link requirement.
Server end establishment matters needing attention:
1st, if the server end also has other networks (for example:
The local area network) connects, is best its separation.
2nd, through the control bench order "ipconfig" may examine the
server end assigns IP address.
Customer end establishment matters needing attention:
1st, finally separates other connections
2nd, through ping order test network connection
condition.
Because quite is slow through the GPRS network speed, needs to
enlarge the ping order the overtime time. Specifically as
follows: "ping IP address ¨Cw overtime time". The general
overtime time may establish is 2000 (ms), through the average
communication time judgement which returns the smallest gathering
cycle which establishes in MCGS. If the average time of return
is 1200ms, then establishes the smallest gathering cycle is 2000ms
quite is appropriate.
In D, test other questions:
1st, equipment test:
Because the equipment test end TimeOut time quite is short, when
test discovered that, the customer end equipment test transmits
successfully, but does not have the data in the server end to receive,
accidentally appears simultaneously receives many transmissions data
packet the situation. So long as determined may ping pass the
network, may enter the movement environment to carry on data
synchronization.
2nd, the first synchronized time quite is long.
In the ordinary circumstances (establishes in particular
gathering cycle quite short time), network data synchronization
succeeds the establishment first communication needs the time quite is
long, often needs about for 20 seconds. After connects
establishes, data synchronization may defer to the hypothesis the
gathering cycle renewal data. Therefore, just was establishing
the connection time needs to wait patiently period of time.
3rd, communication data quantity influence
The communication data quantity and the communication
cycle has quite close relationship. If only a data, may in
1500ms (ping order average time of return be 1200ms) the synchro data,
moreover can establish the communication connection in 12 cycles.
If has 10 data synchronization, the general cycle needs to
establish above 2500ms, and the establishment time quite is long
(20s).
4th, about fixed IP
Through the GPRS network transmission data, the server
end must have to have the fixed IP address. In the actual field
application, needs to apply for a fixed IP address through the
telecommunication department, each customer end needs to solidify this
IP address in connection GPRS Modem, after the customer carries the
electricity the automatic basis solidifies the IP address dials passes
the GPRS network, seeks the server in the network.
When carries on the debugging experiment, obtains through the
Modem digit dialing is only a temporary IP address, after the digit
dialing accesses the net once more, this address can redistribute,
needs to say clearly in the application with the user.
7. conclusions
Uses GPRS to construct the satellite transmitter
supervisory system system, said regarding the user, because the
correspondence expense is lower, enjoyed the actual benefit.
Moreover, because turns on the equipment to be allowed to move,
when the pipe network 监控�moves the equipment may and may
continue along with it migration to use, may protect the user original
investment, suits to the satellite transmitter monitoring work
characteristic, can meet the need well which the satellite transmitter
monitors, moreover, does for the network operation business mobile
communication company also therefore will obtain the service stable
group users, along with the user quantity increase, the mobile
communication company's earning also along with it increase, aroused
the operation business enthusiasm, will conform to the network
construction and the network application synchronization development
request.
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