QIoT node-red-contrib-modbus Modbus-Flex-Getter "PortNotOpenError: Port Not Open"

General
1

Hi there !

I'm trying to use the QNAP QIoT Suite to read values on a Modbus probe. This Suite is using NodeRed. I'm using the node-red-contrib-modbus module.

The probe is connected to a RS485 Module witch is itself connected on a RaspberryPi with the 192.168.1.22 IP adress.

There is my configuration :
Inject > Function > Modbus-Flex-Getter > Modbus Response

Debug

Setup as following :

Inject :
Chain []

Function :
msg.payload = {
'fc': 3,
'unitid': 10,
'address': 164,
'quantity': 1};
return msg;

Modbus-Flex-Getter :
Modbus Client :

Nœud "a2c729b5.350318"
Nom test
Type modbus-client
clienttype "serial"
bufferCommands true
stateLogEnabled false
tcpHost "192.168.1.22"
tcpPort "502"
tcpType "DEFAULT"
serialPort "192.168.1.22/dev/ttyUSB0"
serialType "RTU"
serialBaudrate "9600"
serialDatabits "8"
serialStopbits "2"
serialParity "none"
serialConnectionDelay "100"
unit_id 10
commandDelay 1
clientTimeout 1000
reconnectOnTimeout false
reconnectTimeout 2000
parallelUnitIdsAllowed true

When I trigger the "Inject" node I get these messages :
14/01/2020 à 15:50:26node: 23caa4eb.b96e1c
msg : PortNotOpenError
"PortNotOpenError: Port Not Open"
14/01/2020 à 15:50:26node: 23caa4eb.b96e1cmsg : string[65]
"FSM Reset On State {"value":"failed","actions":,"changed":true}"
14/01/2020 à 15:50:26node: 23caa4eb.b96e1cmsg : string[65]
"FSM Reset On State {"value":"failed","actions":,"changed":true}"

NodeRed is completely new for me and I don't quite get what is the issue here ! Any help ?

2

Hey LTDS, sorry you've had no response after more then a year. Did you ever figure out how to resolve this? I know NR but do not know much about modbus. I am trying to read registers in a MidNite Classic 200 solar charger via TCP into NR running on a rPi3B+ and I consistently get the error "port not open" from the modbus-flex-getter node of node-red-contrib-modbus. I can read the C200 registers just fine every time with a "local app" (windows) someone created (I don't even tell it the IP address or Unit ID and it works) yet not with this node. I do know you cannot have the local app running when trying to access via NR as the C200 allows only one TCP connection at a time.

I searched this topic as I had hoped to find some insight.