Modbus RTU Master - ReadInputRegisters Timeout

[andx]

Hi everybody, I'm facing a problem using the ReadInputRegisters
function to read data from 5 slaves connected to the same serial port.

Following the code line:

for each idx ...
...
reg = master(idx).ReadInputRegisters(slvAdd, regAdd, tmpStr)
...
next

I'm making the read operation polling every 1 sec scrolling the idx
for all the slaves.
I use maximum 3 registers per slave.

If I try the same operation for each slave one by one it works good
but when I use the for statement I got a timeout error from one
slave..
If I remove one slave from the network, the problem goes to another
slave.
Even if I poll every 10 seconds and I set the Transport.ReadTimeout to
1000 ms.

Anybody knows about the problem?

Thanks in advance..

andx

[andx]

The problem seem to be gone after added the following row:

Following the code line:

for each idx ...
...

Threading.Thread.Sleep(10)

reg = master(idx).ReadInputRegisters(slvAdd, regAdd, tmpStr)
...
next

Any suggestion?

[lil_racoon]

Hey andx,

i am also trying to do a read from the data registers but i dont get
any timout my app just gets stuck seems to be an infinite loop or
something,
can you help me out?

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[Scott Alexander]

Set the read and write timeouts on the Transport property of the ModbusMaster

master.Transport.ReadTimeout = master.Transport.WriteTimeout = 1000;