MetraSwitch

#!/usr/bin/python

# switch the meter on, set measurement rate and enable send mode

import sys
import time
import argparse

from openmetra import OpenMetra

# Create the parser
ap = argparse.ArgumentParser(allow_abbrev=False,
                description=
                '''Gossen METRAHit 29S: switch off or select function or select data rate or set RTC time and date.
                Without specifying an action the meter is just switched on.''')
group = ap.add_mutually_exclusive_group()
# Add the arguments

ap.add_argument('-d',
                '--device',
                action = 'store',
                default = '/dev/ttyUSB0',
                help = 'device path of serial interface, default is "/dev/ttyUSB0"' )
group.add_argument('--off',
                action = 'store_true',
                help = 'switch the device off' )
group.add_argument('--function',
                action = 'store',
                type = int,
                dest = 'function',
                default = None,
                help = '''select measurement function: 1:V_DC, 2:V_ACDC, 3:V_AC, 4:mA_DC, 5:mA_ACDC,
                6:A_DC, 7:A_ACDC, 8:Ohm, 9:F, 10:dB, 11:Hz_Uacdc, 12:Hz_Uac, 17:Ohm buzzer,
                18:Temp, 22:pulseW, 23TRMS_mains, 24:Counter, 25:Events_Uacdc, 26:Events_Uac''' )
group.add_argument('--rate',
                action = 'store',
                type = int,
                dest = 'rate',
                default = None,
                help = '''select index of measurement rate: 0:50ms, 1:0.1s, 2:0.2s, 3:0.5s, 4:1s, 5:2s, 6:5s,
                7:10s, 8:20s, 9:30s, 10:1min, 11:2min, 12:5min, 13:10min''' )
group.add_argument('--set_rtc',
                action = 'store_true',
                dest = 'set_rtc',
                help = '''set meter RTC time and date from local time''' )
ap.add_argument('-v',
                '--version',
                action = 'store_true',
                dest = 'version',
                help = 'show openmetra version')
ap.add_argument('-V',
                action = 'count',
                dest = 'verbose',
                default = 0,
                help = 'increase verbosity')

# parse my argument
options = ap.parse_args()

if options.version:
    print( f'OpenMetra version {OpenMetra.VERSION}')
    sys.exit()

with OpenMetra( options.device ) as mh: # open connection to '/dev/ttyUSB0', the serial path can be an optional parameter
    if mh is None:      # could not conect
        print( 'connect error', file=sys.stderr)
        sys.exit()

    mh.set_verbose( options.verbose )

    try:
        if options.off:
            mh.set_mode( mh.MODE_NORMAL )       # switch to normal mode
            mh.send_command( mh.CMD_FW_STATUS ) # get status
            mh.decode_rsp( mh.get_cmd_response(), sys.stderr )
            mh.set_mode( mh.MODE_OFF )          # switch off

        elif options.function is not None:
            mh.set_function( options.function ) # set measurement function
            mh.decode_rsp( mh.get_cmd_response(), sys.stderr )

        elif options.rate is not None:
            mh.send_command( mh.CMD_FW_STATUS )
            mh.decode_rsp( mh.get_cmd_response(), sys.stderr )
            # rate 0: 0.05s, 1: 0.1s, 2:0.2s, 3:0.5s - FAST MODE
            # 4:1s, 5: 2s, 6:5s, 7:10s, 8:20s, 9:30s, 10:60s, 11:2min, 12:5min, 13:10min
            rate = options.rate
            rate = mh.set_rate( rate )
            print( 'Measurement rate:', rate, 's' )
            if options.verbose > 1:
                mh.decode_rsp( mh.get_cmd_response(), sys.stderr ) #
            mh.set_mode( mh.MODE_SEND ) # switch to send mode

        elif options.set_rtc:
            mh.send_command( mh.CMD_FW_STATUS )
            mh.decode_rsp( mh.get_cmd_response(), sys.stderr )
            tm = time.localtime()
            year = tm.tm_year % 100
            month = tm.tm_mon - 1   # jan -> 00, .., dec -> 11
            day = tm.tm_mday - 1    # 00 .. 27 or 29 or 30
            hour = tm.tm_hour
            minute = tm.tm_min
            second = tm.tm_sec

            mh.send_command( 4, 0, 0, 0, second%10, second//10, minute%10, minute//10, hour%10, hour//10 ) # set time
            mh.decode_rsp( mh.get_cmd_response(), sys.stderr ) #

            mh.send_command( 4, 1, 0, 0, day%10, day//10, month%10, month//10, year%10, year//10 ) # set date
            mh.decode_rsp( mh.get_cmd_response(), sys.stderr ) #

        else:
            mh.send_command( mh.CMD_FW_STATUS )
            mh.decode_rsp( mh.get_cmd_response(), sys.stderr )


    except KeyboardInterrupt:           # ^C pressed, stop measurement
        print( '' )