(12) United States Patent
`Oinonen et al.
`
`US006275710B1
`US 6,275,710 B1
`Aug. 14, 2001
`
`(10) Patent N0.:
`(45) Date of Patent:
`
`(54) SYSTEM FOR TRANSMITTING STATUS
`DATA, METHOD FOR TRANSMITTING
`STATUS DATA ON A CONNECTION
`INTERFACE, AND A
`TELECOMMUNICATION TERMINAL
`
`(75) Inventors: Kari Oinonen, Lempaala ; Mirja
`Pautamo, Tampere, both of (F1)
`
`(73) Assignee: Nokia Mobile Phones Limited, Espoo
`(F1)
`
`( * ) Notice:
`
`Subject to any disclaimer, the term of this
`patent is extended or adjusted under 35
`U.S.C. 154(b) by 0 days.
`
`(21) Appl. No.: 09/233,376
`(22) Filed:
`Jan. 19, 1999
`(30)
`Foreign Application Priority Data
`
`6,047,194 * 4/2000 Andersson ......................... .. 455/466
`6,094,587 * 7/2000 Armanto et al.
`455/567
`6,101,393 * 8/2000 Alperovich et al.
`455/466
`
`6,104,932 * 8/2000 Havinis . . . . . . . . . . . . . . .
`
`. . . .. 455/466
`
`455/466
`6,108,559 * 8/2000 Astrom et al.
`6,119,014 * 9/2000 Alperovich et al. ............... .. 455/466
`
`FOREIGN PATENT DOCUMENTS
`
`9/1998 (DE) .
`197 09 827A1
`3/1995 (EP) .
`0645941 A2
`5/1997 (EP) .
`0 772 367 A2
`0813855 A2 12/1997 (EP) .
`WO 94/13092
`6/1994 (WO) .
`
`OTHER PUBLICATIONS
`
`“Digital cellular telecommunications system; Unstructured
`Supplementary Service Data(USSD)—Stage 2” (GSM
`03.90) Version 5.0.0, Dec. 1996 ETSI.
`“Digital cellular telecommunications system (Phase 2+);
`General Packet Radio Service (GPRS): Service description;
`Stage 2” (GSM 03.60 version 5.2.0) ETSI.
`
`Jan. 20, 1998
`
`(El) .................................................... .. 980115
`
`(51) Int. Cl.7 ..................................................... .. H04Q 7/20
`(52) US. Cl. ........................................... .. 455/466; 455/557
`(58) Field of Search ................................... .. 455/422, 432,
`455/466, 517, 556, 557, 67.1, 418, 419,
`420
`
`* cited by examiner
`Primary Examiner—Nay Maung
`Assistant Examiner—Quochien B. Vuong
`(74) Attorney, Agent, or Firm—Perman & Green, LLP
`(57)
`ABSTRACT
`
`(56)
`
`References Cited
`
`U.S. PATENT DOCUMENTS
`
`9/1994 Lahtinen ........................... .. 370/581
`5,351,235
`2/1997 Alanara ................................ .. 455/45
`5,604,921
`11/1997 Seppanen et al. ................... .. 379/59
`5,692,032
`7/1998 Parkas et al. ....... ..
`.. 455/90
`5,787,341
`8/1998 Vanttila et al. ..... ..
`455/419
`5,794,142
`8/1998 Hallikainen et al. .
`455/557
`5,797,102
`8/1998 Berg et al. .......... ..
`455/551
`5,799,255
`11/1998 Vaihoja et al.
`455/574
`5,842,141
`5,915,225 * 6/1999 Mills ............... ..
`455/466
`5,966,653 * 10/1999 Joensuu et al.
`455/466
`6,044,275 * 3/2000 BoltZ et al. ........................ .. 455/466
`
`A system and method for transmitting status data betWeen a
`?rst telecommunication terminal, With at least one connec
`tion interface comprising connection lines, and a second
`telecommunication terminal, Wherein the state of at least one
`connection line is examined and/or set, and a data transmis
`sion connection is set up betWeen the ?rst and second
`telecommunication terminals Whereby the status of the at
`least one connection line is arranged to be transmitted
`betWeen the ?rst and second telecommunication terminals in
`a manner that one or several connnectionless messages are
`arranged to be used in the transmission.
`
`16 Claims, 7 Drawing Sheets
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`12
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`TE1
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`TE2
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`SIERRA WIRELESS 1017
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`U.S. Patent
`U.S. Patent
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`Sheet 1 0f 7
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`US 6,275,710 B1
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`fess
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`A interface 07
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`SM-SC
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`interface
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`Fig. 2
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`U.S. Patent
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`Sheet 2 0f 7
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`U.S. Patent
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`Sheet 3 0f 7
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`Sheet 4 0f 7
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`U.S. Patent
`U.S. Patent
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`Sheet 5 0f 7
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`U.S. Patent
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`Sheet 6 0f 7
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`US 6,275,710 B1
`US 6,275,710 B1
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`1
`1
`SYSTEM FOR TRANSMITTING STATUS
`SYSTEM FOR TRANSMITTING STATUS
`DATA, METHOD FOR TRANSMITTING
`DATA, METHOD FOR TRANSMITTING
`STATUS DATA ON A CONNECTION
`STATUS DATA ON A CONNECTION
`INTERFACE, AND A
`INTERFACE, AND A
`TELECOMMUNICATION TERMINAL
`TELECOMMUNICATION TERMINAL
`FIELD OF THE INVENTION
`FIELD OF THE INVENTION
`
`The present invention relates to a system for transmitting
`The present invention relates to a system for transmitting
`status data as set forth in the preamble of the appended claim
`status data as set forth in the preamble of the appended claim
`1, a method for transmitting status data on a connection
`1, a method for transmitting status data on a connection
`interface as set forth in the preamble of the appended claim
`interface as set forth in the preamble of the appended claim
`9, and a telecommunication terminal as set forth in the
`9, and a telecommunication terminal as set forth in the
`preamble of the appended claim 12.
`preamble of the appended claim 12.
`BACKGROUND OF THE INVENTION
`BACKGROUND OF THE INVENTION
`
`10
`10
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`15
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`2
`2
`outside the mobile communication network. Said short
`outside the mobile communication netWork. Said short
`message service centre SM-SC is coupled with the mobile
`message service centre SM-SC is coupled With the mobile
`services switching centre MSC.
`services sWitching centre MSC.
`For transmitting a short message from a mobile station
`For transmitting a short message from a mobile station
`MS1 (FIG. 1), the message to be transmitted is formed, and
`MSl (FIG. 1), the message to be transmitted is formed, and
`the telephone number of the mobile station MS2, i.e. the
`the telephone number of the mobile station MS2, i.e. the
`identification where the transmission is addressed, is given.
`identi?cation Where the transmission is addressed, is given.
`The short message is usually entered via the keypad of the
`The short message is usually entered via the keypad of the
`mobile station, and the telephone number can be entered via
`mobile station, and the telephone number can be entered via
`the keypad or selected e. g. from a telephone directory stored
`the keypad or selected e. g. from a telephone directory stored
`in the mobile station. Further, the mobile station transmitting
`in the mobile station. Further, the mobile station transmitting
`the short message must know the contact data,
`i.e.
`the
`the short message must knoW the contact data, i.e. the
`telephone number, of the short message services centre
`telephone number, of the short message services centre
`SM-SC. This is usually stored in the memory of the mobile
`SM-SC. This is usually stored in the memory of the mobile
`station, wherein there is no need to enter it separately in
`station, Wherein there is no need to enter it separately in
`connection with each short message transmission. When the
`connection With each short message transmission. When the
`short message is transmitted,
`it passes from the mobile
`short message is transmitted, it passes from the mobile
`station MS to the base transceiver station BTS and further
`station MS to the base transceiver station BTS and further
`via the base station controller BSC and the mobile services
`via the base station controller BSC and the mobile services
`switching centre MSC to the short message services centre
`sWitching centre MSC to the short message services centre
`SM-SC. The short message is stored at the short message
`SM-SC. The short message is stored at the short message
`services centre SM-SC, from where it is transmitted further
`services centre SM-SC, from Where it is transmitted further
`to the receiving mobile station MS2, wherein the route is the
`to the receiving mobile station MS2, Wherein the route is the
`same as in the transmission but reverse. The short messages
`same as in the transmission but reverse. The short messages
`services centre SM-SC is informed whether the mobile
`services centre SM-SC is informed Whether the mobile
`station MS2 has received the short message. Thus, it can
`station MS2 has received the short message. Thus, it can
`retransmit the short message, if it was for any reason not
`retransmit the short message, if it Was for any reason not
`received by the mobile station MS2.
`received by the mobile station MS2.
`In the short message service SMS of the GSM system, it
`In the short message service SMS of the GSM system, it
`is possible to transmit a message of a maximum length of
`is possible to transmit a message of a maXimum length of
`160 characters at a time. The characters are e.g. ASCII
`160 characters at a time. The characters are e.g. ASCII
`characters (American National Standard Code for Informa-
`characters (American National Standard Code for Informa
`tion Interchange) of 7 bits, but it is also possible to transmit
`tion Interchange) of 7 bits, but it is also possible to transmit
`characters of 8 bits which are not necessarily ASCII char-
`characters of 8 bits Which are not necessarily ASCII char
`acters. Also short message services have been developed
`acters. Also short message services have been developed
`where the message can be transmitted in several short
`Where the message can be transmitted in several short
`messages of a maximum length of 160 characters, whereby
`messages of a maXimum length of 160 characters, Whereby
`the length of the short message can be multiplied. For
`the length of the short message can be multiplied. For
`example in the GSM mobile communication system, the
`eXample in the GSM mobile communication system, the
`abbreviation C-SMS is used for this concatenated short
`abbreviation C-SMS is used for this concatenated short
`message service.
`message service.
`The general packet radio service GPRS comprises sepa-
`The general packet radio service GPRS comprises sepa
`rate network elements, such as GPRS support nodes and
`rate netWork elements, such as GPRS support nodes and
`GPRS registers, as well as transmission systems. The trans-
`GPRS registers, as Well as transmission systems. The trans
`mission system used can be for example the TCP/IP
`mission system used can be for eXample the TCP/IP
`(Transmission Control Protocol/Internet Protocol) network.
`(Transmission Control Protocol/Internet Protocol) netWork.
`Because the data transmission is conducted in a packet
`Because the data transmission is conducted in a packet
`network where the data to be transmitted is conveyed in one
`netWork Where the data to be transmitted is conveyed in one
`or several data packets, the maximum benefit is obtained by
`or several data packets, the maXimum bene?t is obtained by
`all service subscribers from such packet form data transmis-
`all service subscribers from such packet form data transmis
`sion. In such packet data transmission, the data transmission
`sion. In such packet data transmission, the data transmission
`channel (radio channel) is not reserved for one user during
`channel (radio channel) is not reserved for one user during
`the entire connection, but only when data packets are being
`the entire connection, but only When data packets are being
`transmitted. This makes it possible to transmit data packets
`transmitted. This makes it possible to transmit data packets
`of several users in the same data transmission channel so that
`of several users in the same data transmission channel so that
`the data packets of different users are transmitted in their
`the data packets of different users are transmitted in their
`own time slots. Each data packet is equipped with address
`oWn time slots. Each data packet is equipped With address
`data, i.e. the telephone number or another identification of
`data, i.e. the telephone number or another identi?cation of
`the recipient. In this connection, reference is made e.g. to the
`the recipient. In this connection, reference is made eg to the
`standard GSM 03.60 of the European Telecommunication
`standard GSM 03.60 of the European Telecommunication
`Standards Institute ETSI, containing a more detailed
`Standards Institute ETSI, containing a more detailed
`description of the general packet radio service GPRS of the
`description of the general packet radio service GPRS of the
`GSM system.
`GSM system.
`In addition to data and voice transmission services trans-
`In addition to data and voice transmission services trans
`mitted via the communication channel, cellular systems
`mitted via the communication channel, cellular systems
`offer supplementary services, whereby data transmission
`offer supplementary services, Whereby data transmission
`relating to these is conveyed via a signalling channel. Thus,
`relating to these is conveyed via a signalling channel. Thus,
`
`In digital mobile communication systems, such as the
`In digital mobile communication systems, such as the
`GSM system, it is possible to send messages without setting
`GSM system, it is possible to send messages Without setting
`up a connection with a circuit coupling. Such non-
`up a connection With a circuit coupling. Such non
`connection methods for message transmission include the
`connection methods for message transmission include the
`short message service SMS, the unstructured supplementary
`short message service SMS, the unstructured supplementary
`service data USSD, or the general packet radio service
`service data USSD, or the general packet radio service
`GPRS. Thus, in addition to calls and data transmission, the
`GPRS. Thus, in addition to calls and data transmission, the
`GSM system offers a paging system type service in the form
`GSM system offers a paging system type service in the form
`of the short message service. However,
`in view of an
`of the short message service. HoWever, in vieW of an
`ordinary paging system, the short message system known
`ordinary paging system, the short message system knoWn
`from the GSM system is considerably more sophisticated. A
`from the GSM system is considerably more sophisticated. A
`mobile station can be used not only to receive text messages
`mobile station can be used not only to receive teXt messages
`but also to transmit them to another mobile station. Another
`but also to transmit them to another mobile station. Another
`advantage of the short message service of the GSM system
`advantage of the short message service of the GSM system
`is that the transmission or reception of a short message can
`is that the transmission or reception of a short message can
`take place simultaneously when an ordinary circuit coupled
`take place simultaneously When an ordinary circuit coupled
`connection is open, e.g. during a call. Thus, the transmission
`connection is open, e.g. during a call. Thus, the transmission
`of a short message will not keep the mobile station busy
`of a short message Will not keep the mobile station busy
`upon a possible incoming call.
`upon a possible incoming call.
`It is an advantage of short messages to calls that they can
`It is an advantage of short messages to calls that they can
`be forwarded to the receiver even if a connection could not
`be forWarded to the receiver even if a connection could not
`be made to the receiver at the moment of transmission. This
`be made to the receiver at the moment of transmission. This
`is implemented by dividing the transmission of a short
`is implemented by dividing the transmission of a short
`message from a mobile station to another in two parts, as
`message from a mobile station to another in tWo parts, as
`illustrated in FIG. 1: from the transmitting mobile station
`illustrated in FIG. 1: from the transmitting mobile station
`MS1 to a short message service centre SM-SC where the
`MSl to a short message service centre SM-SC Where the
`short message is stored and transmitted further to the actual
`short message is stored and transmitted further to the actual
`destination, i.e. the receiving mobile station MS2, when a
`destination, i.e. the receiving mobile station MS2, When a
`connection can be made to it. FIG. 2 illustrates the connec-
`connection can be made to it. FIG. 2 illustrates the connec
`tion between the short message service centre SM-SC to the
`tion betWeen the short message service centre SM-SC to the
`mobile communication system in more detail.
`In the
`mobile communication system in more detail. In the
`following, the transmission and progression of short mes-
`folloWing, the transmission and progression of short mes
`sages between different interfaces, known as such, will be
`sages betWeen different interfaces, knoWn as such, Will be
`described with reference to FIGS. 1 and 2.
`described With reference to FIGS. 1 and 2.
`FIG. 2 shows the structure of the mobile communication
`FIG. 2 shoWs the structure of the mobile communication
`system and the connections for transmitting short messages.
`system and the connections for transmitting short messages.
`Mobile stations MS have radio communication with base
`Mobile stations MS have radio communication With base
`transceiver stations BTS. The base transceiver stations BTS
`transceiver stations BTS. The base transceiver stations BTS
`communicate further, via a so-called Abis interface, with a
`communicate further, via a so-called Abis interface, With a
`base stations controller BSC which controls several base
`base stations controller BSC Which controls several base
`transceiver stations. A unit consisting of several base trans-
`transceiver stations. A unit consisting of several base trans
`ceiver stations BTS (typically some dozens of base trans-
`ceiver stations BTS (typically some doZens of base trans
`ceiver stations) and one base station controller BSC con-
`ceiver stations) and one base station controller BSC con
`trolling them is called a base station subsystem BSS. In
`trolling them is called a base station subsystem BSS. In
`particular,
`the base station controller BSC controls the
`particular, the base station controller BSC controls the
`channels of radio communication and hand-overs between
`channels of radio communication and hand-overs betWeen
`channels. On the other hand, the base station controller BSC
`channels. On the other hand, the base station controller BSC
`communicates, via a so-called Ainterface, a mobile services
`communicates, via a so-called Ainterface, a mobile services
`switching centre (MSC) which coordinates the setting up of
`sWitching centre (MSC) Which coordinates the setting up of
`connections from and to mobile stations. Via the mobile
`connections from and to mobile stations. Via the mobile
`services switching centre MSC, a connection is further made
`services sWitching centre MSC, a connection is further made
`
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`data transmission relating to supplementary services can, if
`data transmission relating to supplementary services can, if
`necessary, take place simultaneously with the connection on
`necessary, take place simultaneously With the connection on
`the communication channel.
`the communication channel.
`Messages relating to supplementary services are trans-
`Messages relating to supplementary services are trans
`mitted between the mobile station on one hand and the home
`mitted betWeen the mobile station on one hand and the home
`location register (HLR) or the visitor public land mobile
`location register (HLR) or the visitor public land mobile
`network (VPLMN) of the cellular system on the other hand.
`netWork (VPLMN) of the cellular system on the other hand.
`The message to be transmitted contains information on how
`The message to be transmitted contains information on hoW
`the network element should process the message. For
`the netWork element should process the message. For
`supplementary services to be introduced in cellular systems,
`supplementary services to be introduced in cellular systems,
`the messages related to the supplementary service can be
`the messages related to the supplementary service can be
`transmitted e.g.
`in the GSM system as an unstructured
`transmitted eg in the GSM system as an unstructured
`supplementary service, i.e. USS data, wherein messages can
`supplementary service, ie USS data, Wherein messages can
`be transmitted in a transparent manner also in such parts of
`be transmitted in a transparent manner also in such parts of
`the system that do not know said supplementary service. In
`the system that do not knoW said supplementary service. In
`this context, reference is made to the ETSI standard GSM
`this conteXt, reference is made to the ETSI standard GSM
`03.90 which contains a description on the transmission of
`03.90 Which contains a description on the transmission of
`unstructured supplementary service data USSD, applied in
`unstructured supplementary service data USSD, applied in
`the GSM mobile communication network.
`the GSM mobile communication netWork.
`SUMMARY OF THE INVENTION
`SUMMARY OF THE INVENTION
`In this specification, telemetric applications refer to appli-
`In this speci?cation, telemetric applications refer to appli
`cations in which the state of a peripheral device is monitored
`cations in Which the state of a peripheral device is monitored
`and the peripheral device is controlled via a telecommuni-
`and the peripheral device is controlled via a telecommuni
`cation network, preferably at
`least partly via a mobile
`cation netWork, preferably at least partly via a mobile
`communication network. This is also called remote drive
`communication netWork. This is also called remote drive
`and remote control. A known telemetric system is a real
`and remote control. A knoWn telemetric system is a real
`estate alarm system for monitoring real estate for fire,
`estate alarm system for monitoring real estate for ?re,
`leakage, burglary, etc. and transmitting the alarm e.g. to a
`leakage, burglary, etc. and transmitting the alarm eg to a
`private security company. The alarm system transmits the
`private security company. The alarm system transmits the
`alarm via a telecommunication network to a monitoring
`alarm via a telecommunication netWork to a monitoring
`room, where the alarm is received by a robot telephone
`room, Where the alarm is received by a robot telephone
`which will inform the monitoring personnel. A disadvantage
`Which Will inform the monitoring personnel. A disadvantage
`in this system is the fact that the transmission of the alarm
`in this system is the fact that the transmission of the alarm
`requires that a telephone connection is set up, whereby a
`requires that a telephone connection is set up, Whereby a
`connection cannot be necessarily made if the telephone lines
`connection cannot be necessarily made if the telephone lines
`of the monitoring room are busy. Further,
`the system
`of the monitoring room are busy. Further, the system
`requires a robot telephone or the like, whereby this tele-
`requires a robot telephone or the like, Whereby this tele
`phone reserves one central
`line solely for this purpose.
`phone reserves one central line solely for this purpose.
`Consequently, a monitoring room for monitoring several
`Consequently, a monitoring room for monitoring several
`different alarm system must be possibly equipped with
`different alarm system must be possibly equipped With
`several telephone lines which are available for the alarm
`several telephone lines Which are available for the alarm
`system only. This increases the costs of the monitoring
`system only. This increases the costs of the monitoring
`system.
`system.
`Another telemetric application is the remote drive and
`Another telemetric application is the remote drive and
`control of pump stations in a sewer system, whereby the
`control of pump stations in a seWer system, Whereby the
`pump station is equipped with detectors for monitoring the
`pump station is equipped With detectors for monitoring the
`position and operating state of pumps and valves. This
`position and operating state of pumps and valves. This
`information from the detectors is transmitted to a
`information from the detectors is transmitted to a
`transceiver, from which the information is transmitted either
`transceiver, from Which the information is transmitted either
`by the radio channel or via a telecommunication network to
`by the radio channel or via a telecommunication netWork to
`a monitoring room provided with a transceiver whereby this
`a monitoring room provided With a transceiver Whereby this
`status information is received. In a corresponding manner,
`status information is received. In a corresponding manner,
`the transceiver of the monitoring room can be used for
`the transceiver of the monitoring room can be used for
`transmitting control commands to the pump station, where
`transmitting control commands to the pump station, Where
`these control commands are received by the transceiver. On
`these control commands are received by the transceiver. On
`the basis of the control commands, the pumps and valves are
`the basis of the control commands, the pumps and valves are
`controlled for changing their state, if necessary. The equip-
`controlled for changing their state, if necessary. The equip
`ment involved in such systems is usually specific, whereby
`ment involved in such systems is usually speci?c, Whereby
`the same equipment cannot be necessarily used for other
`the same equipment cannot be necessarily used for other
`kinds of control and monitoring operations than they are
`kinds of control and monitoring operations than they are
`intended for. The production numbers of such specific
`intended for. The production numbers of such speci?c
`equipment are relatively small, whereby it is not possible to
`equipment are relatively small, Whereby it is not possible to
`utilise the benefits of mass production, which raises the unit
`utilise the bene?ts of mass production, Which raises the unit
`price of such equipment.
`price of such equipment.
`A remote-controlled heating system is also known, in
`A remote-controlled heating system is also knoWn, in
`which the heating of an apartment can be set by telephone
`Which the heating of an apartment can be set by telephone
`
`4
`4
`for example so that the heating can be switched from a lower
`for eXample so that the heating can be sWitched from a loWer
`output to a higher output, or vice versa, by calling a certain
`output to a higher output, or vice versa, by calling a certain
`telephone number. This application can be used e.g. for
`telephone number. This application can be used eg for
`controlling the heating of a summer cottage or a sauna. The
`controlling the heating of a summer cottage or a sauna. The
`dweller may switch the heating to a higher output well in
`dWeller may sWitch the heating to a higher output Well in
`advance before his/her arrival at
`the summer cottage,
`advance before his/her arrival at the summer cottage,
`wherein the temperature of the summer cottage or sauna has
`Wherein the temperature of the summer cottage or sauna has
`risen to a sufficiently high level by the time the dweller
`risen to a suf?ciently high level by the time the dWeller
`arrives. Also a system of this type is intended primarily for
`arrives. Also a system of this type is intended primarily for
`controlling heating, Whereby it cannot necessarily be easily
`controlling heating, whereby it cannot necessarily be easily
`applied for another purpose. Also, markets for these systems
`applied for another purpose. Also, markets for these systems
`are not very large, whereby costs per unit rise to a relatively
`are not very large, Whereby costs per unit rise to a relatively
`high level.
`high level.
`For controlling and monitoring peripheral devices to be
`For controlling and monitoring peripheral devices to be
`used in telemetric systems of this kind, it is typical to use
`used in telemetric systems of this kind, it is typical to use
`current messages or voltage messages. For control and
`current messages or voltage messages. For control and
`measurement of peripheral devices, current and voltage
`measurement of peripheral devices, current and voltage
`message standards have been drawn up, e.g. current ranges
`message standards have been draWn up, e.g. current ranges
`from 4 mA to 20 mA or from 0 mA to 20 mA. Thus, for
`from 4 mA to 20 mA or from 0 mA to 20 mA. Thus, for
`control and measurement of peripheral devices, the aim is to
`control and measurement of peripheral devices, the aim is to
`use these standardised current messages. In control com-
`use these standardised current messages. In control com
`mands of the open/closed type, the control message is set to
`mands of the open/closed type, the control message is set to
`the lower limit (4 mA or 0 mA) for setting the device to be
`the loWer limit (4 mA or 0 mA) for setting the device to be
`controlled in a first position, e.g. for closing a valve. In a
`controlled in a ?rst position, eg for closing a valve. In a
`corresponding manner, for setting the device to be controlled
`corresponding manner, for setting the device to be controlled
`in a second position, e.g. for opening the valve, the control
`in a second position, eg for opening the valve, the control
`message is set to the upper limit, e.g. 20 mA. In a corre-
`message is set to the upper limit, eg 20 mA. In a corre
`sponding manner at measurements, when the measuring
`sponding manner at measurements, When the measuring
`message is at the lower limit (0/4 mA), it indicates that the
`message is at the loWer limit (0/4 mA), it indicates that the
`device to be measured is at its first position (valve closed),
`device to be measured is at its ?rst position (valve closed),
`and correspondingly, when the measuring message is at the
`and correspondingly, When the measuring message is at the
`upper limit (20 mA),
`it
`indicates that
`the device to be
`upper limit (20 mA), it indicates that the device to be
`measured is at its second position (valve open). Instead of
`measured is at its second position (valve open). Instead of
`current messages, it is also possible to use voltage messages,
`current messages, it is also possible to use voltage messages,
`wherein said values typically correspond to voltage ranges
`Wherein said values typically correspond to voltage ranges
`from 1 V to 5 V and from 0 V to 5 V. Sometimes it is
`from 1 V to 5 V and from 0 V to 5 V. Sometimes it is
`necessary to convert current messages to voltage messages
`necessary to convert current messages to voltage messages
`and vice versa, but this is prior art known as such to a man
`and vice versa, but this is prior art knoWn as such to a man
`skilled in the art, whereby it is not necessary to describe it
`skilled in the art, Whereby it is not necessary to describe it
`in more detail in this context.
`in more detail in this conteXt.
`One purpose of the present invention is to achieve a
`One purpose of the present invention is to achieve a
`monitoring and control system whereby information is trans-
`monitoring and control system Whereby information is trans
`mitted between a peripheral device and a mobile station.
`mitted betWeen a peripheral device and a mobile station.
`Further, information is transmitted by using e.g. short mes-
`Further, information is transmitted by using eg short mes
`sages or the like. The system of the present invention is
`sages or the like. The system of the present invention is
`characterised in what is presented in the characterising part
`characterised in What is presented in the characterising part
`of the appended claim 1. The method of the present inven-
`of the appended claim 1. The method of the present inven
`tion is characterised in what is presented in the characteris-
`tion is characterised in What is presented in the characteris
`ing part of the appended claim 9. Further, the telecommu-
`ing part of the appended claim 9. Further, the telecommu
`nication terminal of the present invention is characterised in
`nication terminal of the present invention is characterised in
`what is presented in the characterising part of the appended
`What is presented in the characterising part of the appended
`claim 12. The invention is based on the idea that
`the
`claim 12. The invention is based on the idea that the
`telecommunication terminal, preferably a mobile station
`telecommunication terminal, preferably a mobile station
`coupled with a peripheral device via a connecting interface,
`coupled With a peripheral device vi