IG-267-EN versión 01; 07/04/2017
103
General Instructions
ekor.rpa
Communications
Read/write functions
In principle, only two functions will be implemented, one
for reading and another for writing data.
Data reading
Question:
Start Address Function Data CRC End
Silence DESC ‘3’ ADDR-H ADDR-L NDATA-H NDATA-L 16 bits Silence
Table 12.2. Data reading. Question
Response:
Start Address Function N
º
of Bytes Data CRC End
Silence DESC ‘3’ N DATA1-H DATA1-L ........ 16 bits Silence
Table 12.3. Data reading. Response
where:
DESC Slave address
ADDR-H High byte of the address for the first register to be read
ADDR-L Low byte of the address for the first register to be read
NDATA-H High byte of the number of registers to be read
NDATA-L Low byte of the number of registers to be read
DATA1-H High byte of the first register requested
DATA 1-L Low byte of the first register requested
N Total number of data bytes This will be equal to the number of registers requested
Data writing
This makes it possible to write a single register at the
address indicated.
Question:
Start Address Function Data CRC End
Silence DESC ‘6’ ADDR-H ADDR-L DATA-H DATA-L 16 bits Silence
Table 12.4. Data writing. Question
Response:
The normal response is an echo of the query received.
where:
DESC Slave address
ADDR-H High byte of the address for the register to be written
ADDR-L Low byte of the address for the register to be written
DATA-H High byte of the data to be written
DATA-L Low byte of the data to be written
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