Protocol Structure - Rs485 - Baumer VeriSens ID Series Technical Documentation Manual

The transfer of the datagrams can occur at two different times:

The Vision Sensor transfers the datagrams on request, i.e. as a response to the command "GD".
This mode is designated "Polling mode".

The Vision Sensor transfers data continuously after each image has been transferred.
This mode is designated "Continuous mode".
15.2.2 Protocol structure – RS485
Two means of data transfer are available for the operation of the process interface:

Point-to-point protocol This protocol is a shortened form of the bus protocol. It provides no means
of addressing or verification with a checksum. This protocol is suitable when fast reaction times and
low data volumes are concerned and transfers are verified by other means.

Bus protocol
This protocol permits up to 254 devices to be accessed on one RS485 bus. Communication security
is ensured by the use of synchronization signals and an optional checksum. The formatting of the
data is a so more strictly defined in this protocol, simplifying further processing.
Point-to-point protocol:
The point-to-point protocol consists of a 2-byte command designator followed by the parameters and the
actual data. No control codes are used. Synchronization can be achieved using receive timeout.
Bus protocol:
If you wish to transfer more than 65,535 bytes, e.g. jobs, you can extend the length to 8 bytes (sufficient for
32
2 bytes). This changes the start and end codes:
v2.11.0-B4 297/429
Technical Documentation
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