User Manual

16 Publication 1408-UM001B-EN-P - May 2008
Chapter 3 Communications Command Summary
Modbus RTU Serial and
Optional Modbus/TCP
Ethernet
The power monitor does not initiate Modbus commands but responds
to commands sent by the Modbus master. These Modbus function
codes are supported.
• 03 Read Holding Registers
• 04 Read Input Registers
• 16 Write Multiple Holding Registers
• 08 Diagnostics
– 00 Echo Command Data
– 02 Return Diagnostic Counters
– 10 Clear Diagnostic Counters
• 06 Write Single Holding Register