The python version on master/client is: $ python3 -versionĪnd I start it with this command: $ python3 pymodbus_sync_client_example_2019.07.05-1319.py Modbus Error: Modbus Error: Incomplete message received, expected at least 2 bytes (0 received) 13:35:08,442 MainThread DEBUG transaction :189 Changing transaction state from 'PROCESSING REPLY' to 'TRANSACTION_COMPLETE' 13:35:08,441 MainThread DEBUG transaction :390 Getting transaction 3 13:35:08,440 MainThread DEBUG rtu_framer :235 Frame - not ready (Modbus Error: Incomplete message received, expected at least 2 bytes (0 received)) 13:35:08,439 MainThread DEBUG transaction :234 Transaction failed. 13:35:04,432 MainThread DEBUG transaction :224 Changing transaction state from 'SENDING' to 'WAITING FOR REPLY' 13:35:04,431 MainThread DEBUG sync :73 New Transaction state 'SENDING' 13:35:04,430 MainThread DEBUG transaction :116 Running transaction 1 13:35:04,430 MainThread DEBUG transaction :111 Current transaction state - IDLE Logs for master/client: ModbusSerialClient(rtu baud) The above server/slave just waits with a blinking curser after this last log line. 13:35:08,342 MainThread DEBUG context :78 getValues fc- address-2: count-2 13:35:08,342 MainThread DEBUG context :64 validate: fc- address-2: count-2
13:35:08,341 MainThread DEBUG rtu_framer :115 Frame advanced, resetting header!! 13:35:08,341 MainThread DEBUG factory :137 Factory Request 13:35:00,333 MainThread DEBUG sync :522 Started thread to serve client Logs for server/slave: 13:35:00,333 MainThread DEBUG sync :45 Client Connected
Timeout is already high as you can see in the code. I have tried Raspberry Pi 3 as well as BananaPi. Rr = client.read_input_registers(1, 2, unit=3) I have the following as master/client on the Raspberry Pi 3 / BananaPi: #!/usr/bin/env pythonįORMAT = ('%(asctime)-15s %(threadName)-15s ' The python version on server/slave is: $ python3 -versionĪnd I start it with this command: $ python3 pymodbus_sync_serv_example_2019.07.05-1316.py StartSerialServer(context, framer=ModbusRtuFramer, identity=identity, port='/dev/ttyUSB0', timeout=4, baudrate=115200, stopbits=1, bytesize=8, parity='N') Slave_store4 = ModbusSlaveContext(hr=ModbusSequentialDataBlock(0, *16))Ĭontext = ModbusServerContext(slaves=slaves, single=False) Slave_store3 = ModbusSlaveContext(ir=ModbusSequentialDataBlock(0, *16)) Slave_store2 = ModbusSlaveContext(di=ModbusSequentialDataBlock(0, *16)) Slave_store1 = ModbusSlaveContext(co=ModbusSequentialDataBlock(0, *16)) I have this program as server/slave on my laptop: #!/usr/bin/env pythonįrom import StartTcpServerįrom import StartUdpServerįrom import StartSerialServerįrom vice import ModbusDeviceIdentificationįrom pymodbus.datastore import ModbusSequentialDataBlock, ModbusSparseDataBlockįrom pymodbus.datastore import ModbusSlaveContext, ModbusServerContextįrom ansaction import ModbusRtuFramer, ModbusBinaryFramerįORMAT = ('%(asctime)-15s %(threadName)-15s' pin connections for the Raspberry is as in the tutorial. I am following most of this tutorial for the setup, except for the Arduino is swapped with the laptop adapter:
I have an Raspberry Pi 3 / BananaPi as master/client with this adapter attached: I use the laptop as server/slave with this adapter: Despite the readiness of the server/slave, the master/client just returns the error "Modbus Error: Modbus Error: Incomplete message received, expected at least 2 bytes (0 received)". The slave/server make the things to return ready and is waiting for the master/client to pick them up. Information:Kotlin: kotlinc-jvm 1.3.11 (JRE 1.8.0_191-8u191-b12-0ubuntu0.18.04.Pymodbus master/client can send a request to the slave/server. This issue was imported from GitHub issue: Ktor Versionġ.1.1 Ktor Engine Used(client or server and name)Īpache JVM Version, Operating System and Relevant Context
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