Re: Question about Modbus addressing

On Thu, 26 Apr 2007 13:19:46 GMT, "Alexander Baranov"
<baranov@xxxxxxxxxxx> wrote:

Hello everybody.
I have a specification of a certain device, in which a set of Modbus input
registers have addresses from e.g. 30100 to 30200. Does it mean that I have
to put these address values directly to my request packet or I have to
subtract 30000 and turn them to 100 - 200?

Subtract 30001, since 30001 is the first input register with address 0
in the actual message.

Paul

.