What synchronization mechanism does Modbus RTU rely upon for message boundary definition?
Answer
A defined time gap, or silence, in the transmission line
Modbus RTU, which uses compact binary encoding, requires precise timing to distinguish where one message ends and the next one begins. This synchronization is achieved by monitoring the transmission line for a defined period of silence or time gap. In contrast, Modbus ASCII uses explicit start and end characters for synchronization. This reliance on precise timing in RTU necessitates careful configuration of the serial port settings to ensure that these silent gaps are correctly interpreted by both the master and the slave devices.
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