100 lines
3.2 KiB
Python
100 lines
3.2 KiB
Python
from pymodbus.client.sync import ModbusSerialClient
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from pymodbus.pdu import ExceptionResponse
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import RS485Ext
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import struct
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import time
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def registersToIeeeFloat(i):
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return struct.unpack('f', bytes(
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[((x & 0xff00) >> 8) if y else (x & 0x00ff)
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for x in i[::-1]
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for y in [False, True]
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]
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)
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)[0]
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def registersToIeeeFloatReverse(i):
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return struct.unpack('f', bytes(
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[((x & 0xff00) >> 8) if y else (x & 0x00ff)
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for x in i
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for y in [False, True]
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]
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)
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)[0]
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class ModbusException(Exception):
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def __init__(self, resp):
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self.msg = str(result)
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def __str__(self):
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return self.msg
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ser=RS485Ext.RS485Ext(port='/dev/ttyAMA0', baudrate=1200, stopbits=1)
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client = ModbusSerialClient(method='rtu')
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client.socket = ser
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client.connect()
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delay = 0.05
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try:
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# BG-Tech, Voltage
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result = client.read_holding_registers(address=0x2000, count=2, unit=1)
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if type(result) == ExceptionResponse:
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raise ModbusException(result)
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print("Voltage: {:.2f}".format(registersToIeeeFloat(result.registers)))
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time.sleep(delay)
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# BG-Tech, Frequency
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result = client.read_holding_registers(address=0x2020, count=2, unit=1)
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if type(result) == ExceptionResponse:
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raise ModbusException(result)
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print("Frequency: {:.2f}".format(registersToIeeeFloat(result.registers)))
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time.sleep(delay)
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# BG-Tech, Current
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result = client.read_holding_registers(address=0x2060, count=2, unit=1)
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if type(result) == ExceptionResponse:
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raise ModbusException(result)
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print("Current: {:.2f}".format(registersToIeeeFloat(result.registers)))
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time.sleep(delay)
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# Hottis Thermometer, Resistance Channel 1
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result = client.read_holding_registers(address=0x0004, count=2, unit=3)
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if type(result) == ExceptionResponse:
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raise ModbusException(result)
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print("Resistance Channel 1: {:.2f}".format(registersToIeeeFloatReverse(result.registers)))
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time.sleep(delay)
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# Hottis Thermometer, Temperature Channel 1
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result = client.read_holding_registers(address=0x000c, count=2, unit=3)
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if type(result) == ExceptionResponse:
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raise ModbusException(result)
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print("Temperature Channel 1: {:.2f}".format(registersToIeeeFloatReverse(result.registers)))
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time.sleep(delay)
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# Hottis Thermometer, Resistance Channel 2
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result = client.read_holding_registers(address=0x0014, count=2, unit=3)
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if type(result) == ExceptionResponse:
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raise ModbusException(result)
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print("Resistance Channel 2: {:.2f}".format(registersToIeeeFloatReverse(result.registers)))
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time.sleep(delay)
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# Hottis Thermometer, Temperature Channel 2
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result = client.read_holding_registers(address=0x001c, count=2, unit=3)
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if type(result) == ExceptionResponse:
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raise ModbusException(result)
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print("Temperature Channel 2: {:.2f}".format(registersToIeeeFloatReverse(result.registers)))
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except ModbusException as e:
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print("ERROR: %s" % e)
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finally:
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client.close()
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