On 18 February 2010 14:22, Dave <e...@dc9.tzo.com> wrote:

> Another way to do it is to use a cheap PLC like the Automation Direct
> Click PLC that has onboard analog and connect to it via Modbus

The controller that he already has is Modbus, but I am not sure how
well that integrates with Realtime/HAL

Googling shows that Classic Ladder speaks Modbus, so I might want to
retract my previous statement about the usefulness of the Pixsys
controller. It seems like it might be possible to connect that to EMC
with Modbus and Classic Ladder.

I am not sure what is involved in getting RS485 communications
configured at the PC end. There are USB-RS485 converters available
(http://www.robot-electronics.co.uk/acatalog/Serial_Interface.html for
example) and also RS232-RS485 adapters even more cheaply.

-- 
atp

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