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« on: July 26, 2014, 10:52:58 AM »
Dear Archie I hope that you are in a good condition and I really appreciate your work its awesome project
I send a reply on July 15, 2014, 06:47:20 PM under the Topic: Connect to MODBUS device through USB port (Read 328 times)
About one Problem I found when I Tested the ModbusRTUCom Ver AdvancedHMIBeta363 But I Got no answer
I consider that you are busy too much but I hope you will find some time to read this Topic
Dear Archie the problem is related to Modbus functions 05 & 06
Function 05 Force Single Coil
Function 06 Preset Single Register
Which is as follows for Single Coil there is no need to send the Number of elements and also the command in this case should be FF 00 For Turning on Not 00 01
And also for Preset a Single Register there are no need to send the number of elements and the data length
So There are extra characters in the packet that the driver send to the slave over the serial port any way I summarized what I found in the attached picture pleas have a look
Waiting for your reply
Thank you So much
E.E. MB