Data rate of MODBUS communication between PC and PXI

[BoChen051]

Dear All,

I wonder how fast can we use MODBUS to exchange data between PC and PXI (or between PXI and cRIO)?  

My application (modeled in PXI) needs to receive data as fast as possible. However, when I try to test the data rate of MODBUS communication on LOCAL NETWORK, it seems like the speed is around 60 packets per second. Is there any way of improving the speed?

Thanks,

Bo

[crossrulz]

The problem with Modbus is that it is a command/response structure.  So you have to command the PXI to send the data and then the PXI sends it.  Since speed is an issue, my recommendation is to just stream the data from the PXI and have your PC read the data stream and find the data that it needs.