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Installation and Configuration Manual 79
Modbus Communications
Calculated Parameters Modbus CommunicationsSafety CertificationFactory Default Settings Calculated Parameters Modbus CommunicationsSafety CertificationFactory Default Settings Calculated Parameters Modbus CommunicationsSafety CertificationFactory Default Settings Calculated Parameters Modbus Communications
Safety Certification
Factory Default Settings
D.7.2 Example 2: Reading line density (32-bit register size)
The meter is assumed to have been configured with Register Size = 32-bit (Register 48 = FFFF
16
), and
has slave address = 1.
The following string will read the line density, which is held in Register 257 (0101
16
).
The reply from the meter will be the same as for Example 1.
Checksum
(Automatically
inserted if you are using
ADView.)
Slave address
(hex)
Command number: 3
(Read Register)
Number of registers
to read (Hi byte)
Number of registers
to read (Lo byte
01 03 01 01 00 01 D4 36
Register address
Hi byte
Register address
Lo byte
Checksum
Slave address
(hex)
Command number: 3
(Read Register)
Line density value as
a 32-bit floating point
number
01 03 04 xx xx xx xx cs cs
Reply byte count