Jenkins Posted March 21, 2011 Report Share Posted March 21, 2011 Hello all, When looking at the string generated by the Modbus FB is this: [] = byte [address] [Function] [Registor High] [Register-Low] [Length-High] [Length-Low] [CRC-High] [CRC-Low] According to PI-MBUS-300.pdf, the CRC should be LB, HB. (See Attached Screenshot) My post is two fold: 1. Does anyone have an example where the worked around this? The slave device is looking for CRC LB,HB. 2. A suggestion is to add a pull down in the Modbus configuration to change the CRC-16 order. Jenkins Link to comment Share on other sites More sharing options...
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