Longrun LRF-3000S - Page 52

LRF-3000S Ultrasonic Transit-time Flow meter
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0x01 0x06 0x10 0x03 0x00 0x02 0xFC 0xCB
Flow meter Address Function Code Register Address Register Number CRC Verify Code
4. Error Check
The flow meter only returns one error code 0x02 which means data first address in error.
For example, to read address 1 (0x01) of the flow meter 40002 register data in the RTU mode, the flow meter
considers it to be invalid data, and sends the following command:
0x01 0x03 0x00 0x01 0x00 0x01 0xD5 0xCA
Flow meter Address Function Code Register Address Register Number CRC Verify Code
Flow meter returned error code is:
0x01 0x83 0x02 0xC0 0xF1
Flow meter Address Error Code Error Extended Code CRC Verify Code
5. MODBUS Register Address List
The flow meter MODBUS Register has a read register and a write single register.
a) Read Register Address List (use 0x03 function code to read)
PDU
Address
Register
Read
Write
Type
No. registers*
$0000
40001
Flow/s - low word
32 bits real
2
$0001
40002
Flow/s - high word
$0002
40003
Flow/m - low word
32 bits real
2
$0003
40004
Flow/m- high word
$0004
40005
Flow/h - low word
32 bits real
2
$0005
40006
Flow/h - high word
$0006
40007
Velocity – low word
32 bits real
2
$0007
40008
Velocity – high word
$0008
40009
Positive total – low word
32 bits int.
2
$0009
40010
Positive total – high word
$000A
40011
Positive total – exponent
16 bits int.
1
$000B
40012
Negative total – low word
32 bits int.
2