Using MODBUS for Process Control and Automation
In MODBUS ASCII, all messages are coded in hexadeci-mal, using 4-bit ASCII characters. For every byte of information, two communication bytes are needed, twice as many as with MODBUS RTU or MODBUS/TCP. Therefore, MODBUS ASCII is the slowest of the three protocols, but is suitable when telephone modem or radio (RF) links are used. This is ...
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