Chapter V Communication
18
Example of turbidity reading:
Sent from computer: 00 03 00 00 00 02 C5 DA
Returned by dissolved oxygen meter: 00 03 04 00 00 00 00 EA F3
Return command annotation:
00 is the slave address, settable in the instrument;
03 is the function code, reading and holding register;
04 is the data length of returned turbidity value, which is 4 bytes;
00 00 00 00 is the returned turbidity value 0.00NTU, and the obtained
value
EA F3 is the CRC16 check code, varying with the previous data;
Example of MLSS/TSS reading:
Sent from computer: 00 03 00 02 00 02 64 1A
Returned by dissolved oxygen meter: 00 03 04 00 00 00 00 EA F3
Return command annotation:
00 is the slave address, settable in the instrument;
03 is the function code, reading and holding register;
0x0000
long
4 bytes
0x03
Turbidity value
(in NTU, the
obtained value
needs to be
divided by 100).
Read-only
0x0002
long
4 bytes
0x03
MLSS/TSS
value (in mg/L,
the obtained
value needs to
be divided by
10)
Read-only
