Chengdu Ebyte Electronic Technology Co., Ltd.
E810-TTL-CAN01 User Manual
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Copyright ©2012–2019
,
Chengdu Ebyte Electronic Technology Co., Ltd.
19
With the command: 01 03 00 00 00 08 (in the slave device with address 01, read 8 data starting from address
0000) Write this command to the special tool (Modbus CRC 16 calculator) to calculate the CRC check. The value is
added after the instruction. This command is issued via the UART: 01 03 00 00 00 08 44 0C. When the slave receives
the instruction, it returns the buffer value inside the slave conversion module. (When no new CAN frame data is
received, the cache value read by the host is all 0)
Return instruction:
[Device Address] [Command No. 03] [Number of Bytes Returned] [Data 1] [Data 2]...[Data n] [High 8 bits of
CRC check] [Low 8 bits of CRC check]
Such as:
Once the slave receives instruction 01 03 00 00 00 08 44 0C
,
it returns
:
01 03 10 00 01 00 02 00 03 00 04 00 00 00 00 00 00 00 00 1F 9F
After the reading is completed, the 8 bytes of data are emptied, and the data after the address is moved forward
by 8 data. As shown below: