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sdm630_pymodbus.py
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sdm630_pymodbus.py
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
import struct
from timeit import default_timer as timer
from pymodbus.client.sync import ModbusSerialClient as ModbusClient
import logging
logging.basicConfig()
log = logging.getLogger()
#log.setLevel(logging.DEBUG)
class ModbusReg:
def __init__(self, address, unit):
self.address = address
self.unit = unit
# ------------------------------------------------------------------------------------
# Dict of all SDM630-Modbus Input Registers (Function Code 04):
# http://bg-etech.de/download/manual/SDM630Register.pdf
#
SDM630_REGISTER = {
"Phase 1 line to neutral volts" : ModbusReg( 0x0000, unit = "Volts" ), # !
"Phase 2 line to neutral volts" : ModbusReg( 0x0002, unit = "Volts" ), # !
"Phase 3 line to neutral volts" : ModbusReg( 0x0004, unit = "Volts" ), # !
"Phase 1 current" : ModbusReg( 0x0006, unit = "Amps" ), # !
"Phase 2 current" : ModbusReg( 0x0008, unit = "Amps" ), # !
"Phase 3 current" : ModbusReg( 0x000A, unit = "Amps" ), # !
"Phase 1 power" : ModbusReg( 0x000C, unit = "Watts" ), # !
"Phase 2 power" : ModbusReg( 0x000E, unit = "Watts" ), # !
# --------------------------------------------------------------------------------
"Phase 3 power" : ModbusReg( 0x0010, unit = "Watts" ), # !
"Phase 1 volt amps" : ModbusReg( 0x0012, unit = "VA" ), # !
"Phase 2 volt amps" : ModbusReg( 0x0014, unit = "VA" ), # !
"Phase 3 volt amps" : ModbusReg( 0x0016, unit = "VA" ), # !
"Phase 1 volt amps reactive" : ModbusReg( 0x0018, unit = "VAr" ), # !
"Phase 2 volt amps reactive" : ModbusReg( 0x001A, unit = "VAr" ), # !
"Phase 3 volt amps reactive" : ModbusReg( 0x001C, unit = "VAr" ), # !
"Phase 1 power factor" : ModbusReg( 0x001E, unit = None ), # !
# --------------------------------------------------------------------------------
"Phase 2 power factor" : ModbusReg( 0x0020, unit = None ), # !
"Phase 3 power factor" : ModbusReg( 0x0022, unit = None ), # !
"Phase 1 phase angle" : ModbusReg( 0x0024, unit = "Degrees" ), # !
"Phase 2 phase angle" : ModbusReg( 0x0026, unit = "Degrees" ), # !
"Phase 3 phase angle" : ModbusReg( 0x0028, unit = "Degrees" ), # !
"Average line to neutral volts" : ModbusReg( 0x002A, unit = "Volts" ),
# : ModbusReg( 0x002C, unit = None ),
"Average line current" : ModbusReg( 0x002E, unit = "Amps" ),
# --------------------------------------------------------------------------------
"Sum of line currents" : ModbusReg( 0x0030, unit = "Amps" ),
# : ModbusReg( 0x0032, unit = None ),
"Total system power" : ModbusReg( 0x0034, unit = "Watts" ),
# : ModbusReg( 0x0036, unit = None ),
"Total system volt amps" : ModbusReg( 0x0038, unit = "VA" ),
# : ModbusReg( 0x003A, unit = None ),
"Total system VAr" : ModbusReg( 0x003C, unit = "VAr" ),
"Total system power factor" : ModbusReg( 0x003E, unit = None ),
# --------------------------------------------------------------------------------
# : ModbusReg( 0x0040, unit = None ),
"Total system phase angle" : ModbusReg( 0x0042, unit = "Degrees" ),
# : ModbusReg( 0x0044, unit = None ),
"Frequency of supply voltages" : ModbusReg( 0x0046, unit = "Hz" ), # !
"Import Wh since last reset" : ModbusReg( 0x0048, unit = "kWh/MWh" ), # !
"Export Wh since last reset" : ModbusReg( 0x004A, unit = "kWH/MWh" ), # !
"Import VArh since last reset" : ModbusReg( 0x004C, unit = "kVArh/MVArh" ), # !
"Export VArh since last reset" : ModbusReg( 0x004E, unit = "kVArh/MVArh" ), # !
# --------------------------------------------------------------------------------
"VAh since last reset" : ModbusReg( 0x0050, unit = "kVAh/MVAh" ),
"Ah since last reset" : ModbusReg( 0x0052, unit = "Ah/kAh" ),
"Total system power demand" : ModbusReg( 0x0054, unit = "W" ),
"Maximum total system power demand" : ModbusReg( 0x0056, unit = "VA" ),
# : ModbusReg( 0x0058, unit = None ),
# : ModbusReg( 0x005A, unit = None ),
# : ModbusReg( 0x005C, unit = None ),
# : ModbusReg( 0x005E, unit = None ),
# --------------------------------------------------------------------------------
# : ModbusReg( 0x0060, unit = None ),
# : ModbusReg( 0x0062, unit = None ),
"Total system VA demand" : ModbusReg( 0x0064, unit = "VA" ),
"Maximum total system VA demand" : ModbusReg( 0x0066, unit = "VA" ),
"Neutral current demand" : ModbusReg( 0x0068, unit = "Amps" ),
"Maximum neutral current demand" : ModbusReg( 0x006A, unit = "Amps" ),
# : ModbusReg( 0x006C, unit = None ),
# : ModbusReg( 0x006E, unit = None ),
# --------------------------------------------------------------------------------
# ... 0x0070
# ... 0x0080
# ... 0x0090
# ... 0x00A0
# ... 0x00B0
# --------------------------------------------------------------------------------
# : ModbusReg( 0x00C0, unit = None ),
# : ModbusReg( 0x00C2, unit = None ),
# : ModbusReg( 0x00C4, unit = None ),
# : ModbusReg( 0x00C6, unit = None ),
"Line 1 to Line 2 volts" : ModbusReg( 0x00C8, unit = "Volts" ),
"Line 2 to Line 3 volts" : ModbusReg( 0x00CA, unit = "Volts" ),
"Line 3 to Line 1 volts" : ModbusReg( 0x00CC, unit = "Volts" ),
"Average line to line volts" : ModbusReg( 0x00CE, unit = "Volts" ),
# --------------------------------------------------------------------------------
# ... 0x00D0
# --------------------------------------------------------------------------------
"Neutral current" : ModbusReg( 0x00E0, unit = "Amps" ),
# : ModbusReg( 0x00E2, unit = None ),
# : ModbusReg( 0x00E4, unit = None ),
# : ModbusReg( 0x00E6, unit = None ),
# : ModbusReg( 0x00E8, unit = None ),
"Phase 1 L/N volts THD" : ModbusReg( 0x00EA, unit = "%" ),
"Phase 2 L/N volts THD" : ModbusReg( 0x00EC, unit = "%" ),
"Phase 3 L/N volts THD" : ModbusReg( 0x00EE, unit = "%" ),
# --------------------------------------------------------------------------------
"Phase 1 Current THD" : ModbusReg( 0x00F0, unit = "%" ),
"Phase 2 Current THD" : ModbusReg( 0x00F2, unit = "%" ),
"Phase 3 Current THD" : ModbusReg( 0x00F4, unit = "%" ),
# : ModbusReg( 0x00F6, unit = None ),
"Average line to neutral volts THD" : ModbusReg( 0x00F8, unit = "%" ),
"Average line current THD" : ModbusReg( 0x00FA, unit = "%" ),
# : ModbusReg( 0x00FC, unit = None ),
"Total system power factor degree" : ModbusReg( 0x00FE, unit = "Degree" ), # duplicated entry? (see 0x003E)
# --------------------------------------------------------------------------------
# : ModbusReg( 0x0100, unit = None ),
"Phase 1 current demand" : ModbusReg( 0x0102, unit = "Amps" ),
"Phase 2 current demand" : ModbusReg( 0x0104, unit = "Amps" ),
"Phase 3 current demand" : ModbusReg( 0x0106, unit = "Amps" ),
"Maximum phase 1 current demand" : ModbusReg( 0x0108, unit = "Amps" ),
"Maximum phase 2 current demand" : ModbusReg( 0x010A, unit = "Amps" ),
"Maximum phase 3 current demand" : ModbusReg( 0x010C, unit = "Amps" ),
# --------------------------------------------------------------------------------
# ... 0x0110
# ... 0x0120
# ... 0x0130
# --------------------------------------------------------------------------------
# : ModbusReg( 0x0140, unit = None ),
# : ModbusReg( 0x0142, unit = None ),
# : ModbusReg( 0x0144, unit = None ),
# : ModbusReg( 0x0146, unit = None ),
# : ModbusReg( 0x0148, unit = None ),
# : ModbusReg( 0x014A, unit = None ),
# : ModbusReg( 0x014C, unit = None ),
"Line 1 to line 2 volts THD" : ModbusReg( 0x014E, unit = "%" ),
# --------------------------------------------------------------------------------
"Line 2 to line 3 volts THD" : ModbusReg( 0x0150, unit = "%" ),
"Line 3 to line 1 volts THD" : ModbusReg( 0x0152, unit = "%" ),
"Average line to line volts THD" : ModbusReg( 0x0154, unit = "%" ),
"Total kwh" : ModbusReg( 0x0156, unit = "kwh" ),
"Total kvarh" : ModbusReg( 0x0158, unit = "kvarh" ),
"L1 import kwh" : ModbusReg( 0x015A, unit = "kwh" ), # !
"L2 import kwh" : ModbusReg( 0x015C, unit = "kwh" ), # !
"L3 import kWh" : ModbusReg( 0x015E, unit = "kwh" ), # !
# --------------------------------------------------------------------------------
"L1 export kWh" : ModbusReg( 0x0160, unit = "kwh" ), # !
"L2 export kwh" : ModbusReg( 0x0162, unit = "kwh" ), # !
"L3 export kWh" : ModbusReg( 0x0164, unit = "kwh" ), # !
"L1 total kwh" : ModbusReg( 0x0166, unit = "kwh" ),
"L2 total kWh" : ModbusReg( 0x0168, unit = "kwh" ),
"L3 total kwh" : ModbusReg( 0x016A, unit = "kwh" ),
"L1 import kvarh" : ModbusReg( 0x016C, unit = "kvarh" ), # !
"L2 import kvarh" : ModbusReg( 0x016E, unit = "kvarh" ), # !
# --------------------------------------------------------------------------------
"L3 import kvarh" : ModbusReg( 0x0170, unit = "kvarh" ), # !
"L1 export kvarh" : ModbusReg( 0x0172, unit = "kvarh" ), # !
"L2 export kvarh" : ModbusReg( 0x0174, unit = "kvarh" ), # !
"L3 export kvarh" : ModbusReg( 0x0176, unit = "kvarh" ), # !
"L1 total kvarh" : ModbusReg( 0x0178, unit = "kvarh" ),
"L2 total kvarh" : ModbusReg( 0x017A, unit = "kvarh" ),
"L3 total kvarh" : ModbusReg( 0x017C, unit = "kvarh" ),
# : ModbusReg( 0x017E, unit = None ),
}
SDM630_BLOCKS = {
0x0000 : 40,
0x0050 : 16,
0x00C0 : 40,
0x0140 : 32,
}
def main():
client = ModbusClient(method='rtu', port='/dev/ttyAMA0', baudrate=38400, parity='N', bytesize=8, stopbits=2, timeout=1)
# request modbus register values from device
client.connect()
start = timer()
reg_values = {}
for addr, size in SDM630_BLOCKS.items():
resp = client.read_input_registers(addr, size * 2, unit=1)
block = resp.registers
reg_values.update({ (addr + i): block[i] for i in range(0, len(block)) })
request_time = timer() - start
client.close() # close the client
# convert modbus register values to float
start = timer()
mod_values = {}
for name, r in SDM630_REGISTER.items():
w0 = reg_values[r.address + 0]
w1 = reg_values[r.address + 1]
mod_values[name] = struct.unpack('>f', struct.pack('>HH', w0, w1))[0]
conversion_time = timer() - start
# print all values in order of their modbus address
for (name, _) in sorted(SDM630_REGISTER.items(), key = lambda x: x[1].address):
v = mod_values[name]
u = SDM630_REGISTER[name].unit
print("{:40}: {:10.2f} {}".format(name, v, "" if u is None else str(u)))
print("request took %.3f seconds" % request_time)
#print("conversion took %.3f seconds" % conversion_time)
if __name__ == '__main__':
main()