First commit

software/test_software/modbus_control.py

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+""""
+ModBus control routines
+Copyright (C) 2023 M.T. Konstapel
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <https://www.gnu.org/licenses/>.
+"""
+
+import minimalmodbus
+import serial
+
+class ModBusController(minimalmodbus.Instrument):
+    """Instrument class for Epever Charge Controllers.
+
+    Args:
+        * portname (str): port name
+        * slaveaddress (int): slave address in the range 1 to 247
+
+    """
+
+    def __init__(self, portname, slaveaddress):
+        minimalmodbus.Instrument.__init__(self, portname, slaveaddress)
+        self.serial.baudrate = 9600
+        self.serial.bytesize = 8
+        self.serial.parity = serial.PARITY_NONE
+        self.serial.stopbits = 1
+        self.serial.timeout = 0.3
+        self.mode = minimalmodbus.MODE_RTU
+        self.clear_buffers_before_each_transaction = True
+        self.close_port_after_each_call  = False
+
+    #Address range 0x3000
+    def get_id(self):
+        device_id = [None]*4
+        device_id[0] = self.read_register(0, 0, 4, False)
+        device_id[1] = self.read_register(1, 0, 4, False)
+        device_id[2] = self.read_register(2, 0, 4, False)
+        device_id[3] = self.read_register(3, 0, 4, False)
+
+        return device_id
+
+    def enable_heater(self):
+        self.write_bit(0, 1, 5)
+
+    def disable_heater(self):
+        self.write_bit(0, 0, 5)