How to connect multiple slave devices under the modbus-serial (rtu) connector - modbus

Question

this is my Configuration File. I'm using the new profile https://thingsboard.io/docs/iot-gateway/config/modbus/ [new_modbus.json], in the new configuration file, seems to be able to configure several different devices in { master : { "slaves" : [] }}. And when I do, I couldn't get the right results.
{
"master":{
"slaves":[
{
"unitId":1,
"deviceName":"test1",
"attributesPollPeriod":5000,
"timeseriesPollPeriod":5000,
"sendDataOnlyOnChange":false,
"attributes":[
{
"byteOrder":"BIG",
"tag":"temperature",
"type":"bytes",
"functionCode":3,
"registerCount":1,
"address":1
}
],
"timeseries":[
{
"tag":"distance",
"type":"bytes",
"functionCode":3,
"objectsCount":1,
"address":2
}
],
"attributeUpdates":[
{
"tag":"shared_value_1",
"type":"32uint",
"functionCode":6,
"objectsCount":2,
"address":3
},
{
"tag":"shared_value_2",
"type":"32uint",
"functionCode":6,
"objectsCount":2,
"address":4
}
],
"rpc":[
{
"tag":"bearing_bpfo",
"type":"32uint",
"functionCode":6,
"objectsCount":2,
"address":5
}
],
"host":null,
"port":"/dev/ttyUSB0",
"type":"serial",
"method":"rtu",
"timeout":35,
"byteOrder":"BIG",
"wordOrder":"BIG",
"retries":null,
"retryOnEmpty":null,
"retryOnInvalid":null,
"baudrate":9600,
"pollPeriod":5000,
"connectAttemptCount":1
},
{
"unitId":2,
"deviceName":"Test2",
"attributesPollPeriod":5000,
"timeseriesPollPeriod":5000,
"sendDataOnlyOnChange":false,
"attributes":[
{
"byteOrder":"BIG",
"tag":"temperature",
"type":"bytes",
"functionCode":3,
"registerCount":1,
"address":10
}
],
"timeseries":[
{
"tag":"distance",
"type":"bytes",
"functionCode":3,
"objectsCount":1,
"address":11
}
],
"attributeUpdates":[
{
"tag":"shared_value_1",
"type":"32uint",
"functionCode":6,
"objectsCount":2,
"address":12
}
],
"host":null,
"port":"/dev/ttyUSB0",
"type":"serial",
"method":"rtu",
"timeout":35,
"byteOrder":"BIG",
"wordOrder":"BIG",
"retries":null,
"retryOnEmpty":null,
"retryOnInvalid":null,
"baudrate":9600,
"pollPeriod":5000,
"connectAttemptCount":5
}
]
},
"slave":null
}
The Connector name I am using is the Modbus Connector, and the version information for my deployment is as follows：
OS: Raspberry Pi
Thingsboard IoT Gateway version : 3.0.1
Python version : 3.9.2
Error traceback:
""2022-05-11 15:28:10" - |DEBUG| - [bytes_modbus_uplink_converter.py] - bytes_modbus_uplink_converter - convert - 87 - datatype: telemetry key: distance value: None"
""2022-05-11 15:28:10" - |DEBUG| - [bytes_modbus_uplink_converter.py] - bytes_modbus_uplink_converter - convert - 92 - {'deviceName': 'testUpdate', 'deviceType': 'default', 'telemetry': [], 'attributes': []}"
""2022-05-11 15:28:10" - |ERROR| - [bytes_modbus_uplink_converter.py] - bytes_modbus_uplink_converter - convert - 83 - Modbus Error: [Input/Output] device reports readiness to read but returned no data (device disconnected or multiple access on port?)"
NoneType: None
""2022-05-11 15:28:10" - |DEBUG| - [bytes_modbus_uplink_converter.py] - bytes_modbus_uplink_converter - convert - 87 - datatype: telemetry key: distance value: None"
""2022-05-11 15:28:10" - |DEBUG| - [bytes_modbus_uplink_converter.py] - bytes_modbus_uplink_converter - convert - 92 - {'deviceName': 'RpcTest', 'deviceType': 'default', 'telemetry': [], 'attributes': []}"
""2022-05-11 15:28:10" - |ERROR| - [bytes_modbus_uplink_converter.py] - bytes_modbus_uplink_converter - convert - 83 - Modbus Error: [Input/Output] device reports readiness to read but returned no data (device disconnected or multiple access on port?)"
NoneType: None