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TUF-2000F User Manual
Flow meters made by Huizhong have more than 10 different communications protocols. For
the easier replacement of a water meter, most of these protocols are realized in TUF-2000F
flow meters. Here only one of them, the default for compatible protocols CRL-61D
(D<=50mm), is given for reference.
These protocols are selectable by Menu63, after the selection of MOBUS-ASCI, or
MODBUS-RTU protocols.
interface：RS232，RS485
baud rate：9600 by default，select other 15 different baud rate by Menu 62
parity：NONE, EVEN, ODD can be chosen from Menu 62
Data bits：8
Stop bits: 1, 2
In the following explanation:
XXh stands for the address (or network ID)of the instrument, range:00h-FFh.
YYh stands for the new address that will be assigned, range:00h-FFh.
ZZh the check-sum, which is obtained by means of binary addition of all the data bytes
(take notice to that the addition is for the data bytes, not the controlling and
commands bytes, and the carry over 0ffh is discarded.
H stands for that the number is a hexadecimal number.
All five command are like following:
(1) read water meter data (command 4A）
Format: 2Ah XXh 4Ah
Answer: 26h XXh 4Ah LL(BCD coded ）ZZh
In the above, the contents of LL(BCD) are formatted as in the following table:
13
Error code
Position
Content
1~4
Flow rate
5~8
Positive total flow
9~12
Total time
1
See table below
Bytes
4
The actual value is divided by 1000, unit in cubic
meter per hour.
4
The actual value divided by 10, unit in cubic meter
4
Unit in hour
35
Note
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