FTS 21216, Руководство по эксплуатации

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700-SDI-RADAR-LX-80-Man Rev 1 08 Oct 2021 13 /49
Modbus ID: Configures the device (slave) ID to be used for Modbus RTU protocol. Modbus RTU uses
request/response format and allows multiple instruments to be connected on the same bus.
When a remote master transmits the request message, it will use the device ID as a device
address. All instruments will receive the request, but only the instrument with the matching
device ID will answer to the received request.
SDI-12 ID: The SDI-12 device ID to be used on SDI-12 interface. In SDI-12 request/response protocol,
this ID will be used to define the instrument address, and the instrument will respond only
to requests with the matching ID.
5.1.3 MODBUS PARITY
Figure 5-3: Modbus Parity
Parity is used in serial communication for basic error detection. In general, all bytes on the receiver
side where the parity bit does not match the message will be discarded.
There are three parity options which can be selected:
None: No parity is used, and no error detection is possible on bit level.
Odd Parity: An additional bit is added to the communication that will be set to 1 when there
is odd number of bits with value 1 in the 8-bit payload byte.
Even Parity : An additional bit is added to the communication that will be set to 1 when there
is even number of bits with value 1 in the 8-bit payload byte.
The default setting on most devices that use Modbus is even parity.
5.1.4 MODBUS STOP BITS
Figure 5-4: Modbus Stop Bits