modbus Serial

[shrekt]

Hello,

I am using Modbus comm protocol and communicating with the slave and fetch its holding registers through MB Serial Master Query.vi.

The application i am developing is very time specific.

When i am requesting the master for holding register the reply comes in around 60-70 ms(means MB Serial Query.vi) takes 60-70 ms to execute.

maximum no. of times it takes about this much of time, but sometimes it takes around 200-250 ms.

The difference is 3 times, but time it is'nt but it accumaltes and at the end of program about 20000 iteration the time difference is huge.

any specific reason for this behaviour,

Regards,

Shrek

[RavensFan]

Slow response from the slave because it is doing something else before it gets a chance to send a message back?

[shrekt]

Thanks for the response,

One more condition is there as shown in the ex,

if for 1 request is takes 60 ms then all the other request are finished within 60 ms each.

but if any request takes 200ms then all the other request takes 200 ms each, is there any specific explanation for this behaviour,

Regards,

Shrek