Modbus communication problem

[qsub-D]

Thank you very much but one sub-VI is missing "Msec timer". Could you send me too pls ? 😄

[K C]

OK

[qsub-D]

Hello,

Apparently, this VI works but it doesn't transmit any datas. However, this VI is great and fix a visa problem that I have because I don't receive -1073807298 error code with visa read or write. (1073676294 meaning that we received the same bits number that we had sent)

In conclusion, communication is good but no datas are transmitted with the USB cable ? (I'll try to make the communication with a RS232 cable as soon as I receive the serial pinout of the bench)

[K C]

You say 'No data transmitted'

Well since the ModBus command is OK there is data transmitted (the ModBus comamnd) and data received (the ModBus answer)

Which ModBus lib are you using ? Can you post it here ?

Kees

[qsub-D]

Finally it worked !!! I am using different labraries, and among them is the most common modbus library, and the plasmionique modbus library that you can find in the link below :

https://lavag.org/topic/19544-cr-plasmionique-modbus-master/

Last time I ran the Plasmionique Com Tester, I forgot to also run "MB slave example"... (no comment 😛 )

Thank you KC for you help anyway 🙂

[Desruelle_luc]

hi all, more informations here

A+ Luc