NModbus4 startAddress is more than ushort can handle

Question

I'm programming a PLC with a C# application with NModbus4. (RS232)
I can read data with master.ReadCoils(device, 8192, 1).

Now i've an address like 149153. This is to long for a ushort so i can't pass it as a parameter to ReadCoils.

How can i do this?

Answer 1

The PLC is using a very common address notation for Modbus (although not standard), where the first digit defines the register's data type:

• 0 (coils)
• 1 (discrete inputs)
• 3 (input registers)
• 4 (holding registers)

So, data at address 149153 is actually the discrete input at address 49153.