urdey Posted September 14, 2017 Share Posted September 14, 2017 trying to communicate with master NOVUS GSM Dialler using MODBUS TCP 502 port only but didn't communicate register. Link to comment Share on other sites More sharing options...
AzeoTech Posted September 15, 2017 Share Posted September 15, 2017 OK, first make sure you are connecting to 192.168.0.200 on port 502. Also make sure your other Modbus scanner software is no running as its possible the dialer only supports one connection at a time. Then, in DAQFactory, read D# = 10, "Read Holding Register U16", Channel # = 0. You should get 15447, at least in the picture you provided. 0 corresponds to 40001. You can also put 40001, but I prefer translating to 0 indexing as its more universally supported. Its the addressing your ShortBus scanner is using. Link to comment Share on other sites More sharing options...
urdey Posted September 15, 2017 Author Share Posted September 15, 2017 Thanks for replying I am getting communication but data is not displayed as Modsim 32 simulator from GPS Dialler Link to comment Share on other sites More sharing options...
AzeoTech Posted September 15, 2017 Share Posted September 15, 2017 DAQFactory is sending the correct command, reading 8 holding registers starting at 0 (40001). The device is responding correctly, but is returning all 0's. Are you sure you are talking to the same device as the ModSim? Are you sure its not actually putting it as 0 indexed 40001? Link to comment Share on other sites More sharing options...
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