#!/usr/bin/python
import logging, minimalmodbus
from apscheduler.scheduler import Scheduler #Advanced Python Scheduler v2.12
from time import sleep

pz = minimalmodbus.Instrument("/dev/ttyUSB0", 1)
pz.serial.timeout = 0.1 # had to bump this up from the default of 0.05
pz.serial.baudrate = 9600
logging.basicConfig()
sched = Scheduler()
sched.start()

def read_meter():
    VOLT = pz.read_register(0, 0, 4)
    AMPS = pz.read_register(1, 0, 4)
    WATT = pz.read_register(3, 0, 4)
    WHRS = pz.read_register(5, 0, 4)
    FREQ = pz.read_register(7, 0, 4)
    PWRF = pz.read_register(8, 0, 4)
    print VOLT * 0.1
    print AMPS * 0.001
    print WATT * 0.1
    print WHRS
    print FREQ * 0.1
    print PWRF * 0.01
    print

def main():
    sched.add_cron_job(read_meter, second='*/1')

    while True:
       sleep(1)

if __name__ == "__main__":
    main()