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GoogleCodeExporter avatar GoogleCodeExporter commented on August 29, 2024
I don't see how this could be an NModbus issue. How are you reading the value 
back
from your device? My guess is you're using the wrong numbering format... the 
register
value is assumed to be an unsigned integer.

Original comment by [email protected] on 19 Jun 2009 at 12:37

from nmodbus.

GoogleCodeExporter avatar GoogleCodeExporter commented on August 29, 2024
Hi,
When I read back the value from the nmodbus library, the value is the same 
(38000) 
so the library is consistent. 

After doing some more research, I realized that my controller registers were in 
32 
bit floating point (signed). The old way I was used to connect to it used 
Modicon 
Modbus protocol (enabling floating point data transfer) So if i understood 
well, 
using the nmodbus library I cant write in the memory of my the controller a 
true 
signed 16 bit Integer. Because once the packed is recieved by my controller it 
will 
convert the value to a signed short. One solution to this is to convert the 
value 
back (in the controller) to a unsigned. I didnt open the library yet in .NET 
2008. 
Do you think is is feasable to modify the library to accept different numbering 
format?

Thanks a lot and very nice work with this library, It helped me a lot realizing 
my 
project. 

Original comment by [email protected] on 30 Jun 2009 at 1:03

from nmodbus.

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