PLC | RS485 Mode: ASCII vs RTU

RS485 communication, there are two different formats to choose from.

In addition to different formats, you know that also affect those who do!?

ASCII format:

Start code +7-8 bit data + parity + end code

data = ASCII code (0-127)



RTU format:

Start code +8 bit data + parity + end code

data = 16 hexadecimal code (0-9, a-f)





Points of difference:

1.ASCII can express the words, RTU not.

2.RUT one can send two numbers, ASCII can only send one.

3. Check for errors in different ways.

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In PLC communications with external devices, the

There will only be numbers, there will be no the text communication,

RTU can speed up the selected so the speed of the handshake.