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Micro controller that can handle RS232 and RS422 internally?
I am working on a project where I need a micro controller that can be programmed via USB, RS232, or Ethernet, and can take input (commands) via RS232, RS422, or Ethernet (TCP). Only needs to "speak" one language at a time, board will be designed to be controlled by different external devices.
I have found some that speak TTL and can do other languages via an external chip, but I am trying to avoid that.
1 Answer
- justmeLv 78 years agoFavorite Answer
There are drivers that can do RS232 and RS422. The micro itself doesn't care which one you are using as the data in and out will be TTL. The only real difference between the two is 422 has differential drivers and receivers while 232 is single ended.
I don't know of any micro that can actually drives RS232 / RS422 directly. As far as I know its always TTL to a transceiver chip. The reason is if a stray voltage enters the transceiver the worst you do is blow the transceiver (which have protection). If it enters the micro you blow the micro (much more expensive and harder to replace).