MODBUS to PROFIBUS Converter (Serial to PROFIBUS)
Using the Anybus Communicator to get NMEA GPS data from an Industrial GPS antenna into PROFIBUS
Recently IDX was contacted by a client that wished to get NMEA data strings from a Garmin industrial GPS receiver into the plants PROFIBUS SCADA system.
It was quickly identified that an AB7000 - Anybus Communicator would be the most effective device for the job.
Within the NMEA protocol, various messages are pushed along the data line, each ASCII strings provides new information.
An Example of one of these strings could be a RMC (Recommended Minimum Data), this will look similar to:
RMC Recommended Minimum GPS Data 123319 Fix taken at 12:33:19 UTC A Status A=active or V=Void. 4807.038,N Latitude 48 deg 07.038' N 01131.000,E Longitude 11 deg 31.000' E 022.4 Speed over the ground in knots 084.4 Track angle in degrees True 230394 Date - 23rd of March 1994 003.1,W Magnetic Variation *6A The checksum data, always begins with *
After sniffing the ASCII string using software included with the Anybus communicator, we were able to truncate and map relevant values through to the Profibus driver. The main interest of the plant was to know the location of their rail equipment at all times, in order to prevent a collision. Thus the only relevant info would be the latitude and longitude, in addition we also mapped a few status bytes and integrated a checksum to confirm the data being read as accurate.
This application has been repeated in thousands of separate installations, ranging though various applications, from weigh scales, to scanners, to VSD's and now GPS systems...
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