NModbus with Danie/Enronl Modbus

[Zbych]

Hi All

I have a question about NModbus with Daniel/Enron Modbus extension. In
specification for this extension is e.g. registers from address 7001
to 7999 are 32 bits registers. I found that to read from this
registers I should use function with ID 3 and range 2 (the same for
write except function ID 16). I don't have any device yet to test this
with nmodbus, so I'm asking you does any one tried to use NModbus to
read 32 bits registers?

Regards
ZB

[Huy Nguyen]

you can use customer function to read any registry you can. The readHoldingRegistris and readInputRegistris support 16bit registry

2011/5/10 Zbych <zbura...@gmail.com>

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[Zbych]

Thanks for your answer but in normal modbus if you send request to
device for data from e.g. register 7010 you and range 2 you receive
data from 7010 and 7011. I need to know how it is when you use this
function with the same parameters to read from 32 bits register. I
will receive data from single register 7010 or from two registers 7010
and 7011?

[Huy Nguyen]

you can't use this function. For example, if you get the value of registry 7010 using this function, the data of response message from device include 2 byte and NModbus automatic merge them into a ushort value (16bits). Similarly, if you request 2 registry, 4 byte wille be send from device, NModbus splits 4 byte and return 2 ushort value. If you want to get 32 bits registry, you should create a function, it will merge 4 byte received from your device into a 32 bits number.?

2011/5/12 Zbych <zbura...@gmail.com>

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