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Installation and Configuration Manual 77
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
The meter will respond with the following to show that the meter is set to 16-bits register size:
Or, the meter will respond with the following to show that the meter is set to 32-bits register size.
Thus, by reading the third byte of the response, you can deduce the value of Register 48.
Step 3 Find the byte order
Send the following message (Read Register 47), where nn is the meter’s slave address:
The meter will respond with one of the following:
Examine the first four bytes of the data. If they are all 00, then the meter is in Big Endian mode; if
they are all FF, then the mode is Little Endian.
Slave
Address Command
Register
Address Checksum
nn 03 00 48
10
00 02 checksum
Slave
Address Command Data Bytes Checksum
nn 03 04 4 data bytes checksum
Slave
Address Command Data Bytes Checksum
nn 03 08 8 data bytes checksum
Slave
Address Command
Register
Address Checksum
nn 03 00 47
10
00 02 checksum
Slave
Address Command Data Bytes Checksum
nn 03 04 4 data bytes checksum
Slave
Address Command Data Bytes Checksum
nn 03 08 8 data bytes checksum