SL - Data GSM

Secure Digital Interface 02 - Data Logger with GSM Modem

SL-Data GSM English Tech. Manual PDF format.

SL-Data GSM is a product capable to acquire different types of signals supplied by the field, to save them on a removable memory card , like the SD (Secure Digital) and MMC (Multi Media Card) types and to transfer the logged data to an external system when required, through a wireless serial communication, on GSM network.
This product is the result of numerous experiences, collected in many years by grifo®, during the development of Data Logger applications. The equipment acquire and save different analog and digital signals in a simple, reliable and cheap manner. Moreover it allows to examine and/or process the saved information, later and in a different place, without reaching the istallation place.

The logged data are saved on the memory cards managed by SDI 02, that are the SD and MMC, with FAT16 format and they are aways available in order to ensure all data reliability in any working conditions.
The logged data can be moved to a PC, or any other external unit, through an asynchronous serial communication either on wired lines (RS 232, RS 422, Current Loop, analog modems, etc.) or wireless (GSM, GPRS, UMTS, etc. modems). The data are availbale under files with ASCII format and they are organized in order to be opened with EXCEL spread sheet. Then these data can be saved in different files, or they can be examined, processed, printed, arranged, registered, displayed on graphs, etc. according with user requirements.
Alternatively the same data can be easily moved with a simple extraction of the memory card and a following insertion on a PC provided of a standard multicards interface.

The SL-Data GSM is composed by a group of hardware, firmware and software. This division allow the customers to select two different working modalities:
A) Use the package directly, as it has been supplied, by taking advantage of the provided configurations in order to satisfy the application requirements.
B) Modify the programs Sources in order to change, or add, the new required functionalities.

The operative features, already available or to be added, of the SL-Data GSM are briefly described below.

The firmware and the software normally provided with SL-Data GSM acquire and save the analog and digital signals available on GAB H844, coupled with a selected Mini Module. The programs sources, supplied under specific requirements, are widely remarked, includes all the necessary Procedures and Data Structures and allows the user to develop his firmware and to satisfy his specific requirements. In this manner the SL-Data GSM considerably reduces the development time of data logger applications.

The serial data transfer has been developed with the widely diffused electric communication protocols and it assume a sinple and effordable logic protocol that increase security and speed. Whenever different communication modalities become necessary, they can be easily implemented with a simple intervent on sources and used hardware.

A comfortable configuration mode let the user arrange the SL-Data GSM for the application to develop. As an example, it defines the type of the connected signals, the acquisition time and mode, the features of the physic values acquired (engineering format), the current date and time, etc. Normally the configuration mode is used only one time before the installation of the complete system.

One of the most important features of SL-Data GSM is that it is a ready to use product: the user is not forced to know the selected and used hardware. Thanks to the utility programs and the sources of the package, it is possible to set up, test and use the data logger in few hours.

The most important features of SL-Data GSM are summarized in the following points. In order to simplify the description we define:
- Acquisition Hw -> system dedicated to field signals connection (usually GAB Hxxx + Mini Module).
- Saving Hw -> system dedicated to data saving (SDI 02: for details please read proper documentation).
- Communication Hw -> system and accessories involved in data transfer (usually simple serial cables or a couple of GSM Modem).
- Development PC -> personal computer dedicated to configuration and possible modification of firmware and software executed by other systems.
- Data PC -> personal computer dedicated to communication, download and saving of logged data.

• Acquisition of the Analog Inputs available on acquisition hw.
• Analog Inputs configurable among different Types: two are Voltage inputs (0÷Vmax value, 0÷Vmax value*4) and two are Current inputs (0÷20 mA, 4÷20 mA).
• Analog inputs can be Filtered or not by firmware, and enabled in the acquisition hw configuration.
• Gain Factor application on the analog inputs.
• Analog inputs are converted in Engineering Unit and then saved on memory card.
• Engineering unit for analog inputs defined under configuration with Begin Scale and End Scale values.
• Acquisition of the Digital Inputs available on acquisition hw.
• Digital Inputs configurable among different Types: Boolean (ON/OFF), Counter (0÷65535 pulses in Acquisition time) and Frequency (0÷65535 Hz).
• Analog inputs are converted in Engineering Unit and then saved on memory card.
• Engineering unit for Counter and Frequency inputs defined under configuration with Begin Scale, End Scale values and Counts/Frequency Begin, Counts/Frequency End values.
• Automatic Format of the values in engineering unit, in order to provide always the maximum number of Significant Digits.
• Current status of Digital Outputs, available on acquisition hw, are saved on memory card.
• Header string (with plant features as name, address, type, etc.) can be defined under acquisition hw configuration.
• Measures names of connected physic signals (i.e. AirT., FireT., Motor1, FluxIn, Level, etc.) can be defined under acquisition hw configuration.
• Comfortable Test modality that allows to check the connection of all the field signals and relative conversion, plus formatting, in engineering unit.
• Data saved on Memory Card with SD or MMC type, with 2 GBytes size.
• FAT16 format for memory card.
• Memory card completely managed by SDI 02.
• Data on memory card are organized on single ASCII File, with a table organization, compatible with electronic spreadsheet as EXCEL. These data are never removed from memory card and they are always ready to use, in order to avoid data loss in any working condition.
• Memory card becomes full in a variable time period according with performed configuration and use. In worst conditions (measures with highest significant digits and minimum acquisition time every second) the period reach 180 days; by using typical conditions (measures with 4 significant digits acquired and saved every minute) the memory card is full after about 50 years.
• The fill level of memory card is checked by acquisition unit that signals the full condition with sufficient advance.
• The memory cards and the saved data can be managed by any PC provided of proper multicards interface.
• Summarizing on memory card, and so on transfert file, are svaed following information:
  • Header string with plant and system features;
  • Name of physic measures acquired and saved;
  • Current date and time in DD/MM/YYYY HH:MM:SS format;
  • Measures of analog inputs in engineering units;
  • Measures of digital inputs in engineering units;
  • Digital output status;
  • Possible occured events.
• Comfortable Configuration modes either for acquisition hw and saving hw.
• Configurations are mantained in backed memories (EEPROM) with specific algorithms and reliability controls.
• Acquisition Time can be defined under configuration among 18 standard values (from 1 second to 1 day), or alternatively with a time inserted by user.
• Check of configuration Validity and signalling of possible errors.
• Hws Functionality is Cheked and possible anomalies are signalized on acquisition hw.
• Connection between acquisition hw and saving hw performed with Synchronous I2C BUS communication.
• Connection between acquisition hw and communication hw can be performed with different electric protocols (RS 232, RS 422, Current Loop, Modem GSM, Modem GPRS, etc.).
• Physic protocol for asynchronous communication fixed at 9600 Baud, 8 Bit x Chr, 1 Stop Bit, No Parity, No handshake.
• Logic protocol for communication of Master-Slave type and based on command message and following response. It is described with details both on the source files and inside user manual.
• Management software for data PC that communicates with acquisition hw by using the described electric, physic and logic protocols. It is capable to:
  • Manage a First configuration modality that let the user select the language, the used serial line, the file name for the downloaded data and the possible telephone number, when the connection is through modems.
  • Show the User manual and mantain it on line.
  • Manage and show a group of Controls and States of the software relative to serial communication and files.
  • Perform a Telephone call when connection is through modems and it Release the line at the end of communication.
  • Acquire and show the states of acquisition hw, saving hw and communication hw (among these there is also the memory card full status).
  • Download the data saved on acquisition hw by starting from the last one already saved on data PC file; thanks to this mode the user must only start the download, check the time of received data and stop the download when necessary. Viceversa the same download proceed up to the last data available.
  • Save the downloaded data on the file previously configured, with the already described ASCII table format.
  • Get and set the current date and time of acquisition hw.
  • Reset possible errors and alarms currently enabled on acquisition hw.
• Firmware and software support double language: Italian and English.
• Firmware source developed with Modular Procedures dedicated to any section of the acquisition hw (EEPROM, A/D, Buffered Inputs, Counters, Buffered Outputs, Serial Communication, Data saving, Data loading, Timing, User interface, etc.).
• Wide Documentation and rich list of Examples both in Source and Executable format.
• In order to modify the sources the user needs proper Development Tools used for their realization. Moreover these tools must be installed and used on development PC as described in dedicated technical documentation. For further details about this aspect, please contact directly grifo® company.
• No License nor additional costs. The user is free to develop all the applications that he requires.

For further information please refer to proper SL-Data GSM user's manual.

- At least one SL-Data GSM hardware device.
- A power supply source for the selected hardware device.
- A PC provided of one RS 232 asynchronous serial line (COMx) and one multicards interface.
- A 2 GBytes memory card.
- Serial communication cables.

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