Longrun LRF-3300S, User Manual

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LRF-3300S Ultrasonic Transit-time Flow meter
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For example, to read address 1 (0x01) of the flowmeter 40002 register data in the RTU mode, the flowmeter
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
$000C 40013 Negative total – high word
$000D 40014 Negative total – exponent 16 bits int. 1
$000E 40015 Net total – low word 32 bits int. 2