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PowerScout Modbus Commands
The Modbus commands that are used by the PowerScout meter are the Read Holding Register command, the
Write (Preset) Single Register command and the Return Slave ID command. The Read Holding Register
command is the most often used, as this is the command that retrieves the actual voltage, power and energy
values from the meter. Typically, the RTU continually reads the values from the registers containing the
desired information. The following is a quick-reference to three common Modbus commands:
Read Holding Register (Command #03; each item below is 8 bits) is as follows:
Meter Address
Command (03h)
FIRST MSB
FIRST LSB
Number to read MSB
Number to Read LSB
CRC LSB
CRC MSB
Meter Address = which meter to read, FIRST = First point to read, Number to read = Number of points to read
Write (Preset) Single Register (Command #06; each item below is 8 bits) is as follows:
Meter Address
Command (06h) REG MSB
LEG LSB
DATA MSB
DATA LSB
CRC LSB
CRC MSB
Meter Address = which meter to write, DATA = value to store
Write Return Slave ID Command (Command #17; each item below is 8 bits) is as follows:
Meter Address Command 17h CRC LSB
CRC MSB
Meter Address = which meter to respond
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