I’m trying to write and read the registers in G3800xx016. controlling temperatures and lightning. Please look at the attached pdf file for this unit.. I have used Lookout for about three years, and it works fine.. Now I want to expand my system and try to use Labview 8.0 My temperature register start adress is 100 Hex (256 dec) I read from Register with Function code 03. This register have values from 0-255 witch mean in labview for me as unsigned byte U8 I read my temperature from the register like this: eks.: 40257 lets say value=5 Slave FC Start Adress Byte Value CRC 01 03 0100 02 0005 7847 This is the status received from the Modbus tester when I use null-modem connection.. I receive the same value if I use Modscan32 I have used null-modem cable to read out the values. I have also PIR detectors that control movements and light of and on, and I read these starts at 40017.1 01 03 0010 02 The register to switch on and of heating and lights starts at 404097.1 FC16 Values mention here is read from Lookout 5.0 I have tried examples and read for weeks about this, but everything stops when I try to use Labview 8.0 I can’t read any values from my Master unit, neither write to it, or read any values in Modbus testers when I use null-modem cable.. I have tried different baud rates in my serial connection and it works perfect in Lookout, but Not Labview.. I have even bought DSC module, but I can’t write to either com ports or Modbus testers.. Please anybody… is there anybody that can give me help with this?? Start address for for PIR detectors is 40017.1 (FC03) and for writing bits for on of to light and heatsystem is 404097.1 (FC16) I would be very happy for any idea that can give me some positive results… Look at the attached pdf file. Thanks.. and very best regards from Benjii…

LabVIEW

If you used the modbus master example from the modbus library, then you should be good.

Command x15, slave address 4. register 5002. (If that fails then try 5001).

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