from pymodbus3.client.sync import ModbusTcpClient from pymodbus3.client.sync import ModbusSerialClient client = ModbusSerialClient(method='rtu',port='/dev/ttyUSB0',parity='N',stopbits=1,bytesize=8,baudrate=9600,timeout=3) result = client.read_holding_registers(1,2,unit=1) client.close()
SLAVE_UNIT = 0x1
client = ModbusClient("rtu",
port="COM9",
stopbits=2,
bytesize=8,
baudrate=9600,
timeout=10)
connected = client.connect()
if connected:
print("Tristar Morningstar 1 connected!")
else:
print("Something went wrong.")
exit(1)
start = time.time()
rr = client.read_holding_registers(0xE000, 1, unit=0)
assert (rr.function_code < 0x80)
print(rr)
#data = client.read_coils(READ_COILS_PDU_Addr_Test_1, 1)
stop = time.time()
if data:
succ = "was successful"
else:
succ = "failed"
print("read %s, time spent reading: %fs" % (succ, stop - start))
print("Data read:")
print(data)
client.close()
try:
data = client.read_coils(READ_COILS_PDU_Addr_Test_1, 1)
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
