class Modbus():
# Init modbus device
def __init__(self):
self._client = ModbusClient(method='rtu',
port = PORT,
bytesize = BITS,
parity = PARITY,
baudrate = BAUDRATE,
timeout = 1)
if self._client.connect() == False:
logger_modbus.error(bcolors.FAIL + "*******************************" + bcolors.ENDC)
logger_modbus.error(bcolors.FAIL + "*** ERROR, DEVICE NOT FOUND ***" + bcolors.ENDC)
logger_modbus.error(bcolors.FAIL + "*******************************" + bcolors.ENDC)
time.sleep(1)
return
# Delete modbus device
def __del__(self):
logger_modbus.info("Delete modbus device")
self.close_connection()
return
# Toggle relay
def toggle_relay(self, channel, address):
try:
ret = self._client.write_register(channel, 0x0300, unit=address)
except:
logger_modbus.error(bcolors.FAIL + "Error, slave %s not responde!" + bcolors.ENDC, address)
return -1
logger_modbus.info("Toggle relay %s" %ret)
return ret
# Read status relay
def read_status_relay(self, channel, address):
try:
ret = self._client.read_holding_registers(channel, unit=address)
except:
logger_modbus.error(bcolors.FAIL + "Error, slave %s not responde!" + bcolors.ENDC, address)
return -1
logger_modbus.info("Status relay channel %d: %s" % (channel, int(ret.registers[0])))
return int(ret.registers[0])
# Close device
def close_connection(self):
logger_modbus.info("Close connection!")
self._client.close()
return 0
