Communication

Our company has developed a special device for data transmission which provides the customer with data transmission capability to a special data base in PC or to e-mail (according to quantity of measured values and frequency), possibly to a local reading device. These are MPD 430 radio devices or GSM WINGPRS 3.0 module whereas both types are equipped with a network element for connecting more devices via RS 485 or M-Bus. Thanks to this, the acquisition costs are split to several parts. The read-out can be performed after a command from the control room, or it can be carried out periodically according to set schedules or events. Owing to on-line communications, the system operator has instant summary of the entire system.

WinGPRS 3.0 Communication module

The WinGPRS 3.0 communication module is designed for transmission of measured data from the meters (equipped with M-BUS) using the GSM/GPRS wireless network. Via the internet, the data are downloaded to the central computer where the data can be stored in the data base. This variant requires a server with permanent Internet access with its own IP address. Where this unit cannot be used, it is possible to transmit the data to any e-mail address.


WinGPRS 3.0 Communication module​
  1. Up to 8 meters can be connected to one WinGPRS 3.0 module via RS485 & 3 to 4 devices via M-Bus
  2. The unit is provided with several pulse outputs
  3. The transmitted data are encrypted by an accidental 32-bit key
  4. When using VPN, the maximum security of transmitted data is ensured
  5. Each module has its own connection schedule
  6. Possibility of setting any data reading interval
  7. Sending out the data upon on call via the authorized telephone number
  8. Where no permanent internet access is available, the data can be sent to e-mail

 

WinGPRS_30.pdf (194kb)

Functional description

Downloading data via server:
The measured data is transmitted from the meter by means of M-BUS protocol via M-Bus or RS485/422 interfaces into the UniGPRS module. Then the data from there is flowing via GSM/GPRS (možno and also private VPN) and subsequently via the INTERNET to the server where can be stored right in the data base automatically without any further processing. The data from the server can be further distributed by means of standard network protocols to any workstation. The entire system of WinGPRS 3.0 modules makes use of dynamic IP addresses only which means that the client is not forced to pay flat service charges for higher number of static IP addresses.
Downloading data via e-mail:
The data is running similarly as indicated in the previous case, but the data downloaded from the meters is sent out by e-mail. So it is not necessary to have permanent access to the Internet and the server of one's own. In both cases, it is possible to download data at pre-set intervals or on call by phone dialling.

Wi-Fi data transmission

We implement uni- and bi-directional Wi-Fi communication channels with a complete system for connecting all sorts of devices possibly with a possibility of using an industrial PC for full accommodation to the given device.

MPD-433 Radio data communication device

ZThe MPD-433 is designed for radio data transmission from CALOR 20 and CALOR 30 meters to the readout device (OZ) supplied by COMAC CAL. The transmission takes place on 433.92 MHz which is covered by general permit of the Czech Telecommunication Office (i.e. ISM band) with the maximum power up to 10 mW and Baudrate 9600 Bd.

 

MPD-433 Radio data communication device
  • The communication of MPD-433 with CALOR 30 takes place via RS 485 whereas the communication with CALOR 20 is carried out by the current loop where MPD-433 substitutes the Current Loop to Serial Interface Converter, thanks to which CALOR 20 can be directly connected to MPD-433. Up to 9 meters can always be connected to one device.
  • The identification of the particular CALOR meter is given by a four-figure address in the form ZZZM where M indicates the CALOR's communication address (for CALOR 20 "SET PAR ADR") and it may take the value of 1 to 9. ZZZ indicates the address of MPD-433 and it may take the value of 001 - 999. In case of CALOR 20 meters, during reading out, the appropriate ZZZM address is sent back to OZ and it substitutes the serial number for readout purposes. The CALOR 30 is identified by its serial number and the data in OZ is always written under the serial number of the particular CALOR 30.

mpd433.pdf (136kb)

MPD-433OZ Mobile readout device

The MPD-433OZ is actually the MPD-433 without AC power supply. It is battery-operated and supplemented with a D-meter for signal strength measurement. In addition, it is equipped with a helical antenna connected by a TNC connector.


MPD-433OZ Mobile readout device​
  • • While the readout is prepared in the program supplied along with OZ, we can define and compile readout paths where the sequence of ZZZM addresses is indicated that are subsequently offered by OZ and made inaccessible after correct readout has been made so that multiple readouts from one meter can be prevented. If required, it is possible to move along the path manually and read a meter beyond the order. When reading a meter not included in the path is requested or if we need multiple readouts from the same meter, it is possible to set any address in "Reading from address" mode and read it thereafter.
  • In the readout preparation program, it is possible to set the number of repeated attempts and readouts by which means adverse influence of interference and potential communication drop-outs is limited. After reading correct data, "Dobre" (good) is displayed on OZ, and in case of incorrect data, "Chyba" (error) is displayed and the data is not stored.

 

mpd433(1).pdf (136kb)

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