We should begin, as always remember to join, that is a plc plc plc … In other words, to understand the theory, and then find out how our producer of choice “makes it work.” Some manufacturers are RS-232 communications capabilities in the main processor. Some use “programming harbor” for these. Others need to spend to buy (ie an extra $ ’s) to speak a module “RS-232″ with an external device.
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What is an external device, you may ask? The answer is difficult because there are so many external devices. It may be a user interface, an external computer, an engine controller, a robot, a vision system, a … Get the point? (more…)

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