Receive series MB

The Modbus LabVIEW library includes MB series Receive.vi. The first structure to sequence in this vi includes the comment "the next Subvi dealing with basically the whole string ignores the address for some reason serial any.» I guess he assumes that you talk only to 1 devices at one time"

I use Modbus RTU RS485 on to communicate to two engine controllers. Either a single device at a time works perfectly. The two devices together reads the first and then fails with an error in time-out 6101 to receive MB series during the second. This seems to be a known issue, but I can't find any solution among the many positions dealing with this general failure.

Last post. The problem seems not to be with my coding LV. When I request information from disc 1, all devices on the bus to receive the response. My PC can handle the response, compile the application disc 2 and transmit, before disc 2 has acknowledged that the message of disc 1 is without interest and delete. So, my request disc 2 never gets 'heard' because player 2 is always busy to withdraw its buffer for reading of unwanted things. I intend to control and monitor the two drives together, but have now rewritten the code for them separately. The cause is that readers have a processor much smaller and slower than the control PC and do not treat comms a high priority.

Thanks for being there to bounce ideas.

Tags: NI Software

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