Bidirectional GPRS connection with Telit GM862-PY
Contents
1. Figure 12 Handling valid HTTP POST request The main method is listening to the AT interface for new SMS message indications and HTTP requests After receiving a new HTTP request it calls the SocketServer s serve method with the client s IP address and the HTTP request both parsed from the initial HTTP request read from the AT interface The SocketServer creates a request handler ReqHandler which in turn creates an OutFile OutFile is responsible for writing responses out to the client through the AT interface ReqHandler parses the request and saves the data in a Request object If the request was valid the valve is turned and a response is written to the client by calling OutFile s method writeOut After responding to a request and closing the connection a log message is written to a log file in the module and on a remote server Log information can thus be read during execution from a predefined address The log file in the module can only be read in command mode and thus can not be viewed while the application is running 18 32 logToTerminal message logToServer message Bidirectional GPRS connection with Telit GM862 Tom Hannelius 5 4 AT commands AT commands Hayes Command Set are used to communicate with the module The module performs different actions based on the AT commands provided to it Telit s modules support different sets of AT commands When working with Telit s modules make s2. iode 16 5 3 2 Handling an HTTP request ariari enoar niai E AEE AREV 18 5 4 AC T COMMANDS tenerte tite RENE E ES 19 18 10 07 2 32 Bidirectional GPRS connection with Telit GM862 Tom Hannelius 6 OPERATOR S MANUAL niniin inin rairaon aR G R EE EERE E R 21 6 1 USING THE APPLICATION oh S HR D e eri EEE REE EE 21 6 1 1 Starting up the application 21 6 1 2 Sending an SMS message to the module eene 21 6 1 3 Connecting to the module using an client eere 22 6 2 COMMAND SCRIPT MODE 26 6 2 1 Starting up command 26 0 2 2 Starting Up IN Script mode t e e Ee pee ae d 26 6 3 WRITING UPLOADING AND EXECUTING SCRIPTS nennen tenen 27 6 4 TROUBLESHOOTING ce meteo nin Pane nA RID 30 0 4 1 Reading theinnerlog file uet a etit reris 30 642 Redlediziszia RR RR on aN ewan nad anak 30 64 3 SMS messaging ie ao eU UE ERR E Cen 30 6 4 4 communicat oseni 30 6 4 5 Writing uploading and executing 30 Mno Hs y 18 10 07 3 32 Bidirectional GPRS connection with Telit GM862 Tom Hannelius 18 10 07 OVERVIEW This document was written based on a research project done for the Institute of Automation and Control ACI at Tampere University of Technology TUT in 2006 The goal of the
3. init data Ly I I 1 handleMessage message I 7M 1 i alt if legal value 1 i turnValve value i E 1 Fa 1 REMO n T 4 et URS RO EE GLEN ER SHE GU RUE dues ar f tap alt if illegal value i sendErrorMessage i II 111 ile bape a M 1 log message 1 delMessageFromTerminal activateNewMessagelndication Figure 11 Handling an SMS message 18 10 07 16 32 logToTerminal message logToServer message Bidirectional GPRS connection with Telit GM862 Tom Hannelius 18 10 07 The main method is listening to the AT interface for new SMS message indications and HTTP requests When it detects a new SMS message indication it first deactivates the indication of new SMS messages and closes the listening socket These are done because possible new SMS message indications and HTTP requests arriving at the AT interface might cause unwanted behaviour in the script while it is processing an SMS message The indication of new SMS messages is detected at the AT interface but no message data is transferred during this process SMSServer asks for the unread messages data with readNewMessages The result of this function call can contain one to twenty new units of SMS message data 20 is the maximum am
4. Telit Easy Script The Telit Easy Script feature allows driving the GM862 PY module internally by scripts written Python a high level programming language After writing a Python script a developer uploads the script to the module and sets it as executable Starting the module in script mode will cause the script to run See ch 6 2 Command script mode and 6 3 Writing uploading and executing scripts The Python version is 1 5 2 so built in types functions and libraries are restricted to this version The module has an NVM of 3MB This space is allocated for user scripts and other files The file system in the module allows a user to read and write files on a single level No subdirectories are supported A RAM of 1 5MB is reserved for the Python engine s usage In addition to Python s libraries six libraries are available to establish interaction with the GM862 PY A short description of these libraries is provided in table 1 For more please refer to M2MEasy MDM Interface to the AT command parser engine SER GPIO MOD 5 SPI Table 1 Internal libraries 10 32 Bidirectional GPRS connection with Telit GM862 Tom Hannelius 3 4 2 EZ10 configuration The EZ10 s serial port is used to connect the module to the valve controller through the Nokeval 7470 figure 7 The serial port is controlled by the script through the SER interface A led is connected to the GPIO and controlled by the script through the GPIO in
5. Among other things you will find the module s IP address there The IP address is needed for connecting to the module via HTTP requests figure 16 Once up and running the valve can be controlled by SMS messaging or HTTP requests Sending an SMS message to the module To send an SMS message you need to know the number of the PIN card inserted in to the module The syntax of a valid message is shown in figure 14 text number Figure 14 The syntax of a valid SMS message text is the not case sensitive word valve and numbers is an integer between 0 and 100 Zero or more whitespaces can be in front and or behind the message One or more whitespaces has to be between lt text gt and number An example of a valid SMS message is show in figure 15 21 32 Bidirectional GPRS connection with Telit GM862 Tom Hannelius 18 10 07 vaLVe 100 Figure 15 A valid SMS message After sending an SMS message to the module the red led will flicker once The Python script will start processing the message and turn the valve if the message was valid or send an error message back to the sender if the message was invalid If the led does not flicker the valve is not turned and an error message is not sent back or if you have any other problems concerning SMS messaging please refer to chapter 6 4 Troubleshooting Connecting to the module using an HTTP client The Python script implements a basic web server capable of ha
6. Python File 8 555 NetWare Copy 8KB Python File SKB Python File BD timers D 241 gt 4KB Python File Scan for Viruses 6KB Python File 9 utils p Open With 6KB Compiled Pythor i8 wait F 1KB HTMLFile acy gt Figure 23 Compile Python file This option compiles the file and saves it in the same directory with a pyo extension Compilation results and possible errors will appear in the active command prompt window This new option makes software development for the module much faster see ch 7 Own notes 27 32 Bidirectional GPRS connection with Telit GM862 Tom Hannelius Once your script is compiled it is time to upload it to the module Use a terminal application i e RSTerm and start the module in command mode figure 24 Click the Telit Python view open 1 navigate to your working folder from the left 2 choose your compiled file in Files in PC folder window 3 and click Upload selected file s from PC to folder 4 Round Solutions GSM terminal inl xj Python Tek GPS Terminal About Download selected file s from module to PC Select a file in list above poor to use buttons below ATHESCRIPT ATSDSCRIPT Delete selected fles on module Working f R C Documents and Settings Admirestrator Desktop Hi 1 4 Upload selected file s from to module selected py fiefs ATHEXECSCR ATRSSCTRACE 0 ATSOMU
7. anything else alve demo Mozilla Firefox Edit View History Bookmarks Tools Help 5 S gt 3 Getting Started E Latest Headlines M How to Troubleshoot x Disabley 2 Cookies 5 557 2 Forms 77 Images 129 Information Valve demo B Give a control signal to the valve 0 100 0 closed 100 open send Current valve position 0 open Figure 17 Main page The index html page consists of a static HTML part containing a simple form and a dynamic JavaScript part containing the functions that talk to the server This construction combined with using XML to facilitate the sharing of data is referred to as AJAX Asynchronous JavaScript and XML Applying input to the form and clicking the send button will cause a POST request to be sent to the module The payload of the POST request will contain the XML data containing the control signal provided as input to the form lt xml 1 0 gt lt request gt 100 lt request gt Figure 18 XML message containing valid user input 23 32 Bidirectional GPRS connection with Telit GM862 Tom Hannelius 18 10 07 If the input is valid the valve will be turned to the desired position and an XML response will be returned containing the current valve position lt xml version 1 0 gt lt response gt Current valve position 100 open lt response gt Figur
8. process and local control functionalities are discussed in Sim Remote control is covered in this document Nokeval 7470 serial to analog converter The Nokeval 7470 is a serial bus controlled analog output unit It provides four mA or V outputs that can be controlled by an RS232 RS485 bus Before initial use the 7470 must be configured This is done easily with a PC or a hand held programmer 6790 In the case of PC configuration the PC it is connected to the 7470 s RS232 or RS485 bus or to the 3 5mm POL connector located on the front panel A program called MekuWin is used to configure the converter Another useful software Sicala is used to test the connection and configuration For information on the hand held programmer and more information on the 7470 please refer to Nokeval For information on configuring and testing the 7470 please refer to MekuWin and Sicala Nokeval 7470 in the application The 7470 is connected between the EZ10 and the Metso ND800 valve controller to provide a conversion of serial data to an analog message An RS232 bus using RX COM and TX pins is used between the EZ10 and the 7470 figure 2 Figure 2 Nokeval 7470 serial input from EZ10 and power input 7 32 Bidirectional GPRS connection with Telit GM862 Tom Hannelius Two wires are used to connect the 7470 through the switch to the Metso ND800 figure 3 and figure 4 In addition to these connections the 7470 requires an operating voltag
9. project was to update ACI s SMS controlled Metso ND800 valve application with a bidirectional GPRS connection using Telit s EZ10 with GM862 PY wireless GSM GPRS modem Interactive control was to be achieved without the need for initializing the connection from the modem s side As a result the valve is now controlled locally through an operator panel and remotely by SMS messaging and HTTP requests web browser via the software developed in Python residing in the GM862 PY The document starts off with at look at the system setup in chapter 3 A look is taken at the devices that the application builds on Chapter 4 provides a description of the network environment that the application functions in Chapter 5 digs into the brains of the application the software which is written in Python Use case class and sequence diagrams are presented to give an insight into the software functionality An operator s manual is provided in chapter 6 We take a look at how the application is operated and go through the process of developing applications and uploading them to the modem Chapter 7 lists some personal thoughts and ideas that arose during the project This document is mainly directed to ACI personnel operating the application This said though general instructions and troubleshooting that help develop software for Telit platforms are provided 4 32 Bidirectional GPRS connection with Telit GM862 Tom Hannelius 2 TERMS AND DEFIN
10. 4 1 6 4 2 6 4 3 6 4 4 6 4 5 18 10 07 Troubleshooting Reading the inner log file Start up in command mode and type AT RSCRIPT telitServer log The contents of the file will be printed on your terminal software s screen Red led If the red led does not fire in one minute after starting up with the valve application set as the executable make sure that you started the module in script mode If the red light fires but soon after dies this usually means that no service is provided by the network Make sure that the PIN card is inserted correctly and try powering up the module again in script mode If you have problems with start up please refer to the inner log file see ch 6 4 1 Reading the inner log file for error messages SMS messaging The SIM card can hold a maximum of 20 SMS messages If the maximum is reached and new messages are sent to the module an indication in the AT interface will not be seen and asking for unread messages will not result in new message data This is essential if the preferred message storage location is set as the SIM card HTTP communication Only one socket can be opened at a time Multiple socket connections can not be made Only one connection request can be accepted at a time Writing uploading and executing scripts If the name of a Python script has more than 12 characters it can not be uploaded to the module 30 32 Bidirectional GPRS connection with Telit GM862
11. Bidirectional GPRS connection with Telit GM862 PY Tom Hannelius Research assistant TUT ACI Bidirectional GPRS connection with Telit GM862 Tom Hannelius TABLE OF CO NTENTS 1 OVERVIEW 4 2 TERMS AND DEFINITIONS 5 3 SYSTEM SET BP LED ELE 6 3 1 LOCAL ENVIRONMENT 6 3 2 PLC VALVE CONTROLLER AND VALVE 7 3 3 NOKEVAL 7470 SERIAL ANALOG CONVERTER T 3 3 1 Nokeval 7470 in the application eese eene nennen nennen nee 7 3 4 EZ10 WITH GM862 PY 9 J4l Telit Easy se be e e eee eee tena 10 BAZ EZIO CONPISUPAHON iin 11 4 E E E EERE 12 4 1 PHYSICAL 12 42 13 4 3 HTTP COMMUNICATION nnn pena aua 13 5 eisscidsscastessscasidsisccssvssecsssstecesosesssedvascdevevanedocawsccesuavesoasuseeesdeterssssusasescosesoosspscssensdueses 14 5 1 175 5 nete 14 5 2 15 5 3 SEQUENCES ecd t ede eo e t er setae te ate 16 3 3 1 Handling n SMS
12. ITIONS AJAX Asynchronous JavaScript and XML EZ10 The GM862 PY modem board housing interfaces power antenna SIM RS232 RJ11 and status leds GM862 PY The GSM GPRS cellular modem with Python engine GPIO General purpose input output GPRS General Packet Radio Service GSM Global System for Mobile communications HTTP Hypertext Transfer Protocol NVM Non volatile Memory PLC Programmable logic controller RAM Random Access Memory SMS Short message service 18 10 07 5 32 Bidirectional GPRS connection with Telit GM862 Tom Hannelius 3 SYSTEM SET UP 3 1 Local environment Figure 1 points out the devices in the local environment Updates to the earlier environment Sim include the EZ10 the Nokeval 7470 and the switch The switch gives the option to control the valve manually through the PLC or remotely by SMS messaging and HTTP requests through the EZ10 Metso Automation ND800 Valve Controller Unitronisc M90 PLC EZ10 with GM862 PY Metso Automation Valve system 5 actuator and valve D A converter for M90 PLC Nokeval 7470 serial to analog converter for GM862 PY Figure 1 Devices in the local environment 18 10 07 6 32 Bidirectional GPRS connection with Telit GM862 Tom Hannelius 3 2 3 3 18 10 07 PLC valve controller and valve system The Metso ND800 valve controller and Metso Automation valve system ECO5 actuator and valve build up the process that is controlled locally or remotely The
13. Tom Hannelius 18 10 07 OWN NOTES Currently the software allows anyone to control the valve through SMS messaging It does not implement an allow list for phone numbers that are authorized to control the valve An allow list can and should be implemented and used when parsing the incoming SMS message in class SMSServer Occasionally after receiving the first valid control signal through SMS or HTTP after system start up and sending serial data to the 7470 no action is seen It is not clear where the point of failure is The second and proceeding control signals have the desired effect It would be convenient to have a led on the EZ10 that tells the mode command script the module is in A soft reset button would also be convenient to enable easy switching between command and script mode The software was developed with Telit s PythonWin v3 1 This version had some restrictions that resulted in a significantly longer time to develop software for the module Scripts could not be compiled on the PC They had to first be uploaded to the module and compiled on the module Compiling a script on the module takes from a few seconds to several minutes depending on the scripts size Telit has released a new version of PythonWin V4 1 reduces compilation time by enabling compilation on the PC It also improves some other Python features USE PYTHONWIN 4 1 Use the latest Firmware Check versions from www m2m platforms com The script tha
14. XSCR 1 115200 5 5 1 10 ATHSHDN Figure 24 Uploading a file 18 10 07 28 32 Bidirectional GPRS connection with Telit GM862 Tom Hannelius To make your uploaded application run on start up you must set the file containing the main method called by the Python engine as the executable script This file must not be compiled on your PC see ch 7 Own notes Select the file from the Files in module window 1 and click ATHESCRIPT 2 Your script is now set to run the next time the module starts up in script mode figure 25 Int Provider RTC Voke SMS Camera Telt Python Telit GPS Terminal About ATHLSCRIPT Files in module 1 Download selected file s from module to Select a file in list above peor to use buttons below ATHESCRIPT 2 E ATHOSCRIPT Delete selected fles on module Working tolder cick to change R C Documents and Settings Admirestraton Desktop H mi SMSMessage py zi Upload selected file s from PC to module selected py 4 ATHEXECSCR ATRSSCTRACE 0 ATACMUXSCR 1 115200 5 5 1 10 ATHSHDN Figure 25 Setting a script as executable For problems concerning writing uploading and executing scripts please refer to chapter 6 4 Troubleshooting 18 10 07 29 32 Bidirectional GPRS connection with Telit GM862 Tom Hannelius 6 4 6
15. detects the RS232 DTR pin being low 2 8V connection closed and or the RS232 cable unconnected as it powers up it will start in script mode To start in script mode 1 make sure that the connection between your PC and the module is closed and or the RS232 cable unconnected 2 power up the module 26 32 Bidirectional GPRS connection with Telit GM862 Tom Hannelius 6 3 18 10 07 Writing uploading and executing scripts Any text editor can be used to write a Python script All you have to remember is to save the file with a py extension This said though there are several IDEs that provide an easier way to develop Python software The Python version in the GM862 PY is 1 5 2 so developing software for the module based on a newer Python version makes no sense The PythonWin IDE combined with TelitPython 1 5 2 v4 1 is an obvious choice A packet that includes both of these can be downloaded from www m2m platforms com Once a Python script is written it must be compiled before it is uploaded to the module Version 4 1 of TelitPython provides an easy way to do this Just right click on your file in your file manager and choose compile figure 23 CIT gung ne 7 Python File mainA py 1KB Python File README txt 1KB Text Document 10 KB Python File 9 ReqHi opan 7KB Compiled Pythor BD Reque Compile 4KB Python File respol Download 1KB XML Document Edt 3KB
16. e 19 XML message containing response The dynamic part of the index html page will parse the XML and update the current valve position on the static part figure 20 demo Mozilla Firefox File Edit View History Bookmarks Tools Help amp c 10 9 Getting Started Latest Headlines How to Troubleshoot LKML x Disable 2 Cookies 55 CSS j Forms Images Information Valve demo Give control signal to the valve 0 100 0 closed 100 open Current valve position 100 open Figure 20 page after valid input If an invalid input is provided the module will respond with an XML message containing an error message lt xml version 1 0 gt lt response gt Error invalid control signal lt response gt Figure 21 XML message containing error message 24 32 Bidirectional GPRS connection with Telit GM862 Tom Hannelius Once again the dynamic part will parse the XML and update the error message on the static part figure 22 Valve demo Mozilla Firefox File Edit History Bookmarks Tools Help quc e tt 9 Getting Started E Latest Headlines M How to Troubleshoot LKML My x Disabler 2 Cookies CSS5 2 Forms 3 Images 7 Informationy Valve demo Give a control signal to the valve 0 100 0 closed 100 333 i Error invalid control si
17. e of 24Vdc Figure 4 Valve controller input from Nokeval 7470 A message from 0 to 100 is constructed in the Python script based on user input The 7470 converts the serial data to a standard current message of 4mA to 20mA 0 corresponds to 4 mA and 100 to 20 mA The Metso 0800 controls the actuator based on the provided current and eventually the actuator turns the valve to the desired position 18 10 07 8 32 Bidirectional GPRS connection with Telit GM862 Tom Hannelius 3 4 18 10 07 An RS232 POL cable was used to configure and an RS232 to test the 7470 These cables are marked as seen in figure 5 Seah Lond CH Figure 5 Nokeval 7470 configuration and test cables EZ10 with GM862 PY The GM862 PY is a telecommunications module that integrates a Python engine allowing self controlled operations The GM862 PY includes features such as GPRS class 10 voice circuit switched data transfer fax phone book SMS and on board SIM reader The EZ10 is a ready for use subsystem for wireless communication It provides a board for the GM862 PY and the external interfaces shown in figure 6 Power OK 5212 ARES Antenna RF RS232 D Power supply GPI3 connector connector 1 RJ11 AUX connector connector Network status SIM Card LED connector Figure 6 EZ10 interfaces M2MDesc 9 32 Bidirectional GPRS connection with Telit GM862 Tom Hannelius 3 4 1 18 10 07
18. enied by a firewall separating the research network from the outside internet In addition the GM862 PY implements a firewall that can be configured with AT commands to allow or disallow certain IP addresses 13 32 Bidirectional GPRS connection with Telit GM862 Tom Hannelius 5 SOFTWARE 5 1 Use cases The use case diagram in figure 9 shows all the possible actors and use cases in the application A remote user is a person who sends control signals to the module by SMS messaging or HTTP requests and can read a log file on the web A remote user does not have direct access to the process A local user is a person who has direct access to the process Send HTTP request Send SMS message Read logfile in web Operate modem in command mode Update firmware Local user Remote user Control valve manually Figure 9 Use case diagram 18 10 07 14 32 Bidirectional GPRS connection with Telit GM862 Tom Hannelius 5 2 18 10 07 Classes The Python software consists of the classes seen in the class diagram figure 10 In addition to these classes three Python scripts are included in the application timers py utils py and mainA py timers py offers methods for creating and handling timers utils py offers general purpose methods for logging setting the real time clock RTC connecting to a server sending a signal to the signal converter etc mainA py contains the Python idiom called by the Python engine at sta
19. gnal Current valve position 100 open Figure 22 Main page after invalid input For solving any problems dealing with connecting to the module or sending HTTP requests please refer to chapter 6 4 Troubleshooting 18 10 07 25 32 Bidirectional GPRS connection with Telit GM862 Tom Hannelius 6 2 6 2 1 6 2 2 18 10 07 Command script mode The module can be operated in two modes command and script When in command mode the module responds to user input provided with a data terminal application on a PC connected to the modem s RS232 interface A terminal application that found very useful Round Solutions GSM terminal or RSTerm can be found at www roundsolutions com techdocs Hyperterminal is another application that suites as well When in script mode the module executes the script that has been set as the executable script Starting up in command mode If the module detects the RS232 DTR pin being high OV RS232 cable connected and connection opened as it powers up it will start in command mode To start in command mode 1 connect your PC to the module with an RS232 cable make sure the module s power cable is disconnected 2 open a connection to the connected COM port with your terminal application 3 power up the module 4 test the connection by typing in AT if everything works normally OK should be printed to your terminal application s window Starting up in script mode If the module
20. ndling HTTP GET and POST requests The functionality of the web server is restricted to GET and POST requests with a certain syntax Any requests that differ from this syntax are responded to with an HTTP error code and an error message The connection can be achieved with any HTTP capable client To connect to the module you must know the module s IP address The network service provider NSP provides the module an IP address dynamically at GPRS context activation application start up from the range private ip address private ip address The allocated IP address can be read after initializations from public server address Mozilla Firefox File Edit Go Bookmarks Tools Help 29 2 oo 1 10 M Customize Links FAC local Free Hotmail Google Windows Media Windows Ruokalistat 1 http 130 230 14 0g_messages html 00 01 01 00 07 25 Starting up My ip address is address 07 10 12 00 07 42 setRTC 07 10 12 14 30 21 TelitServer up and running Figure 16 Log page 22 32 Bidirectional GPRS connection with Telit GM862 Tom Hannelius 18 10 07 After typing in the IP address and only the IP address to your web browser s address bar and hitting enter a GET request is sent to the module If the request is valid the Python script will respond with the index html page figure 17 No other html pages reside on the module so do not go asking for
21. ount of SMS messages that fit in to the SIM card Each message is parsed and saved in to an SMSMessage object and based on the message s data the valve is turned or an error message is sent back to the sender s number After handling the SMS message a log message is written to a log file in the module and on a remote server Log information can thus be read during execution from a predefined address The log file in the module can only be read in command mode and thus can not be viewed while the application is running After handling the message messages new message indication is turned back on and the socket is opened in listen 17 32 Bidirectional GPRS connection with Telit GM862 Tom Hannelius 5 3 2 18 10 07 Handling an HTTP request The sequence diagram in figure 12 describes what happens when the module receives a valid HTTP POST request Main SocketServer RegHandler Request QutFile Utils request listen serve client ip request init 10 gt 4 gt serve client_ip request init dient ip request 1 do POST tumValve value i writeOut response l log message
22. rt up SMSMessage HFmessage num string sender num string text string parseDataStrina writeMessageData delMessageFromTerminal 5 55 message SMSMessage init serve H sendErrorMessage ReqHandler OutFile equest string init serve do_GET do POST SocketServer ip string H init H serve client ip string request method string ttp version string path info string Hscript name string name string ram value string headers string vinit parseRequest stripPathinfo Figure 10 The main classes in the application After initializations at start up the main method starts to listen to the AT interface and delegates incoming SMS message indications to an SMSServer object and HTTP requests to a SocketServer object These objects handle the data they receive and respond in an appropriate manner 15 32 Bidirectional GPRS connection with Telit GM862 5 3 Sequences 5 3 1 Handling an SMS message Tom Hannelius The sequence diagram in figure 11 describes what happens when the module receives an SMS message esee E new message indication D ten serve closeSocket openSocket deactivateNewMessagelndication 1 1 1 1 1 1 1 1 1 1 1 1 1 readNewMessages 1 1 loop 0 20 until no unread messages 3
23. t is set as executable must always be a py file Do not compile the file that you set as executable on your PC If your application consists of several Python files create a file that only contains a Python idiom that calls the application logic and set this file as executable 31 32 Bidirectional GPRS connection with Telit GM862 Tom Hannelius 8 REFERENCES M2MAT GM862 PY AT Commands Description http www m2m platforms com data 80000ST10025a AT Command s Reference Guide r3 pdf Read 17 10 2007 M2MDesc Telit GM862 PYTHON Product Description http www m2m platforms com data 80269st10024a_EZ10 QUAD PY Prod Descr rO pdf Read 17 10 2007 M2MEasy Easy Script in Python http www m2m platforms com data Python 20Easy 20Script_Man ual pdf Read 17 10 2007 MekuWin Configuration software http www nokeval com english products software index html Read 17 10 2007 Nokeval User manual http www nokeval com english pdf Manual 7470ma nual pdf Read 17 10 2007 Ruoh Timo Ruohonen Bidirectional GPRS in Machine to Machine Applications Master of Science Thesis April 2004 Sicala Test software http www nokeval com english products software in dex html Read 17 10 2007 Sim Report of Valve demo application Petr Simacek TUT ACI 18 10 07 32 32
24. terface The led provides status info figure 7 Figure 7 EZ10 at work 18 10 07 11 32 Bidirectional GPRS connection with Telit GM862 Tom Hannelius 4 NETWORK 4 1 Physical topology The physical topology of the environment is pictured in figure 8 Web server for logging Mobile device and utilities ADSL modem f TeliaSonera DataNet AIN network for GPRS research Sonera Control Gate Test terminal station Figure 8 Physical topology The EZ10 with GM862 PY is connected to the process A PIN card provided by network service provider Sonera is inserted in to the module The PIN card provides Sonera s Control Gate service which in addition to basic GSM functionality enables bidirectional machine to machine communication in GPRS and data networks For a more detailed explanation of the network please refer to Ruoh 18 10 07 12 32 Bidirectional GPRS connection with Telit GM862 Tom Hannelius 4 2 4 3 18 10 07 SMS messaging SMS messages are sent to and from the module according to basic SMS messaging rules No restrictions on the sender s phone number are implemented See ch 7 Own notes for implementing restrictions on the sender s phone number HTTP communication HTTP requests can be sent to the module with PC s connected to the AIN Automation and Information Networks network for GPRS research The process is not accessible with computers outside this network Requests are d
25. ure that you are referring to the AT Commands Reference Guide that corresponds to your module s version Reference guides can be downloaded from www m2m platforms com Figure 13 shows a diagram describing the AT commands sent from the Python script to the module s AT interface during initialization For a complete list of AT commands supported by the GM862 PY and more information on the AT commands in figure 13 please refer to M2MAT 18 10 07 19 32 Bidirectional GPRS connection with Telit GM862 Tom Hannelius at gprs 1 activate gprs context HIP Figure 13 AT commands sent during initialization 18 10 07 20 32 Bidirectional GPRS connection with Telit GM862 Tom Hannelius 18 10 07 OPERATOR S MANUAL Using the application Starting up the application Make sure that all the power cables except the EZ10 s are plugged in Make sure that the pressure hose is plugged in Make sure that a PIN card is inserted Start the module is script mode see ch 6 2 Command script mode When the application has ran all the initialization scripts the red led connected to the module s GPIO port will fire If the red light does not fire or fires and soon after dies please refer to chapter 6 4 Troubleshooting Once powered up in script mode the Python engine runs the script that was set as the executable script After initializations you will see log messages starting to flow to public server address
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