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#!/usr/bin/env python3
import minimalmodbus
import serial
powerMeter = minimalmodbus.Instrument('/dev/ttyUSB0', 1)
powerMeter.serial.baudrate = 9600
powerMeter.serial.bytesize = 8
powerMeter.serial.parity = serial.PARITY_NONE
powerMeter.serial.stopbits = 1
powerMeter.mode = minimalmodbus.MODE_RTU
# Print the details of the power meter here, these also include the config needed to talk to the unit.
print('Details of the power meter are:')
print(powerMeter)
def readPowerMeter():
print("Attempting to read power meter")
try:
voltageReading = powerMeter.read_register(0, 0, 4)
ampsReading = powerMeter.read_register(1, 0, 4)
wattsReading = powerMeter.read_register(3, 0, 4)
frequencyReading = powerMeter.read_register(7, 0, 4)
print("Voltage", voltageReading/10)
print("Amps", ampsReading/10)
print("Watts", wattsReading/10)
print("Frequency", frequencyReading/10)
except IOError:
print("Failed to read from instrument")
# Run the function to read the power meter.
readPowerMeter()
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