Cannot WriteMultipleCoils - EasyModBus.Exceptions.QuantityInvalidException

[Anonymous]

I'm working on EasyModBus to use a MURR ModBus, model CUBE20S.
It works fine, except for use the command WriteMultipleCoils.

I have a stack of 2 Output Modules, each of 8 signals (8 bit).

I got an array of Signals in Boolean, and I send to it with WriteMultipleCoils, starting from Bit 0.

Dim BB as Boolean() = {True, False, False, True, False, False, False, True}
myMURR.WriteMultipleCoils(0, BB)

In this way, I got the error:

Exception "EasyModBus.Exceptions.QuantityInvalidException"

If I try with an iteration writing single coil like this:

Dim BB as Boolean() = {True, False, False, True, False, False, False, True}
For i as Integer = 0 to (BB.Length - 1)
    myMURR.WriteSingleCoil( i, BB(i) )
Next

... I don't have any exception and it Works like a charm.

So, writing multiple coils is much easy for my project.

[Rossmann Engineering]

Hi,

this exception is thrown, if the Server (You Murr Cube Device) answers with an exception code.

Of course it is much better to write multiple Coils instead of 8 request for single coils.

I just tried it, and the Request to the Server is correct.

Stefan

[Anonymous]

I see, but the previous version, May 2015, works better on write multiple coils, mith the same device.

[Rossmann Engineering]

Could be the "unitIdentifier". Try to set the properyt "UnitIdentifier" to "0".