Fez Spider e RS485

Archive
21

Why do I say that is inaccessible?

22

Because itā€™s a protected method (only accessible from the class it self or a derived class).

But you donā€™t need to call it from your code.
If a WriteSingleCoil telegram is sent from your master on the RS485 bus to the NETMF device (which is the slave) then this method is automatically called internally.

23

I can implement the function OnReadWriteMultipleRegisters on my slave to multiple addresses.
For example:
device1 address 0
.
.
devace1 address 3

24

If a device is a sensor, then yes.

25

the devive is the slave and the address is the sensor

26

Exactly

27

how to implement the slave number and number of sensor?

28

1st, to only read values you should implement OnReadInputRegisters.

The sensor could be identified by the startAddress.

The Modbus device number is defined when initializing it (see one of my initial posts).

But Iā€™m not sure if you and me mean the same by device.
For me a device is a single NETMF device with a single RS485 interface, and is represented by a single Instance of your implementation of the ModbusDevice class.
This device can have multiple sensor then.
The measurement values are mapped to input register addresses, which are read only.
Any configuration can be mapped to holding registers, which can be read and written.
The addresses are only a virtual construct, and can be mapped by your implementation to anything you like.

Please read the Modbus document I posted a link to here.

29

You have a complete example that uses the master slave library?

30

What I have posted in this forum is a simple sample.
My own project is a bit complex and unfinished to post it here.

31

I have implemented the master, you can manage it with a GUI?
This is a GUI in your libraries?
How can I call ?

32

There is no GUI in my library. Itā€™s a communication library.
In parallel Iā€™m working on a Windows Tools to send Messages to devices, but iā€™ts far away from being complete and progress is slow.

33

Have you tried your library for interfacing with SCADA?

34

Googling SCADA shows me that this is quite general topic.
But I donā€™t see why it shouldnā€™t work.