Modbus 485 Help

Hi Guys,

Do some know of a good site when I can learn modbus interface?

From Delta dvp-ss2 to any slave unit.

I do understand the pricipal of modbus system but need to find out more of the finer points.

Thanks
Pieter

Geez - a simple Google search reveals http://www.modbus.org/specs.php
Not that simple of course but the basics are there.

Great tutorial: Chipkins' Modbus for Field Technicians:
http://www.chipkin.com/files/liz/MODBUS_2010Nov12.pdf