93 lines
3.3 KiB
Python
93 lines
3.3 KiB
Python
""""
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ModBus control routines
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Copyright (C) 2023-2025 M.T. Konstapel
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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"""
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import minimalmodbus
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import serial
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class ModBusController(minimalmodbus.Instrument):
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"""Instrument class for Epever Charge Controllers.
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Args:
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* portname (str): port name
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* slaveaddress (int): slave address in the range 1 to 247
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"""
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def __init__(self, portname, slaveaddress):
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minimalmodbus.Instrument.__init__(self, portname, slaveaddress)
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self.serial.baudrate = 9600
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self.serial.bytesize = 8
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self.serial.parity = serial.PARITY_NONE
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self.serial.stopbits = 1
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self.serial.timeout = 0.3
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self.mode = minimalmodbus.MODE_RTU
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self.clear_buffers_before_each_transaction = True
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self.close_port_after_each_call = False
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#Address range 0x3000
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def get_id(self):
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device_id = [None]*4
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device_id[0] = self.read_register(0, 0, 4, False)
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device_id[1] = self.read_register(1, 0, 4, False)
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device_id[2] = self.read_register(2, 0, 4, False)
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device_id[3] = self.read_register(3, 0, 4, False)
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return device_id
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def get_type(self):
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device_type = self.read_register(4, 0, 4, False)
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return device_type
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# Get the 60 character long description string from ModBus device
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def get_type_string(self):
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register_offset = 6 # ModBus register for text string starts at 6
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device_type_register = [None]*30 # ModBus register for text string is 30 integers long
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device_type_string = "" # Store the decoded string here
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for index, entry in enumerate(device_type_register):
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# Read Type string registers
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device_type_register[index] = self.read_register(index + register_offset, 0, 4, False)
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# Convert to ASCII string
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device_type_string += chr((device_type_register[index] & 0xFF00) >> 8)
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device_type_string += chr(device_type_register[index] & 0xFF)
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return device_type_string.strip()
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def get_number_of_input_registers(self):
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device_number_of_input_registers = self.read_register(36, 0, 4, False)
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return device_number_of_input_registers
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def read_all_input_registers(self):
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number_of_input_registers = self.get_number_of_input_registers()
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offset = 40
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input_register = [None]*number_of_input_registers
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for index in range(number_of_input_registers):
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input_register[index] = self.read_register(index + offset, 0, 4, False)
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return input_register
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def enable_heater(self):
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self.write_bit(0, 1, 5)
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def disable_heater(self):
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self.write_bit(0, 0, 5)
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