HPELUKAT Posted August 28, 2008 Share Posted August 28, 2008 Hi, I'm trying to connect to a device (Circutor power analyzer) that uses the Modbus RTU protocol through a serial port (I'm using a RS232 to USB converter). The data I'm reading is of Unsigned Long Reverse Words type - in modbus scanner, where it always works without a problem!!! First of all I have a sequence that seemed to work before i formatted the PC in question. The sequence is: delay(3) while (1) delay(3) Var.test = Device.ModbusRTU.ReadHoldingRegistersUWSLI(1,60,1) var.test2 = Device.ModbusRTU.ReadHoldingRegistersUWSLI(1,30,1) V.DnevnaMoc = var.test / 1000 V.trenmoc = var.test2 / 1000 delay(3) endwhile the problem is that it does not work anymore.. It seemed to work fine before. The only way it starts to work with the sequence above, is when I start another instance of DAQFactory(I still have the trial version installed so I can modify the settings without the hardware key). I made a new *.ctl file containing only two channels reading from ModbusRTU device. The data type is of course invalid (Read Holding Registers Unsigned 32-bit), but the data is read without a problem. When this file was open and both channels active, I opened the original file with the sequence above (immediatelly an error occured in the newly open file - the port is in use by another app...). So I closed the test *.ctl file, started the sequence and VOILA it magically started to work.... and now every time I want to start the readout from the device I have to do the procedure described above. Please help! Thanks Link to comment Share on other sites More sharing options...
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