hello
I am a newbie on node-red.

Modbus Server Node Red

Modbus ActiveX control for Visual Basic, Excel etc. The MBAXP demo is a complete operating ActiveX control that has a 60-minutes time limit. After 60 minutes, communication functions will be disabled. Re-starting the application will initiate another 60-minutes demonstration period. MODBUS Protocol is a messaging structure developed by Modicon in 1979, used to establish client-server communication between intelligent devices.

// 4.0.0-DEV + ModbusTLS: Modbus TCP Security Client/Server + ModbusTLS: ESP8266 Client/Server + Test: TLS ESP8266 Client/Server + Examples: TLS added-Examples: TLS Certificate test Role extension and Alt-Name-Examples: TLS Add example explanation + ModbusTLS: ESP32 Client-Test: TLS ESP32 Client + Build with no STL dependency-Test: No-STL mode + ModbusTCP: ModbusEthernet - W5x00 Ethernet. Modbus TCP/Ethernet. The TOP Server Modbus Suite provides the ultimate in flexibility for connectivity to the widest range of devices supporting the Modbus protocols. Whether you need Serial or Ethernet connectivity to Modbus devices, Modicon or third-party, this product gives you a diversity of options, also including Modbus Plus connectivity. The function codes of Modbus are elements of Modbus’ request/reply PDUs (Protocol Data Unit). In order to build the Modbus application data unit, the client must initiate a Modbus transaction. It is the function which informs the server as to which type of action to perform.

Modbus Server Node-red

I want to setup a modbus TCP SERVER on my rasp PI which would have a certain IP address and aswer to requests coming from a remote Modbus TCP client (etiher coils or holding register)

I have uploaded Modbus contrib, node-red is working fine.

I am very confuse with how to setup a flow which would:
Create a Modbus TCP Server being able to get connected to a Modbus TCP Client
use nodes that would allow this server to send values to the client, based on functions codes (3 / 5 / 15 / ...)

I found many examples on how to setup a Modbus TCP CLIENT getting data from remote servers, I want to develop the opposite, i.e. have my PI being a server, which would react to queries from a remote client (which in that case would be a PLC polling data from multiple slaves/servers)

Any help would be wellcome, or indication about an example of flow which I could look into

Thanks

JL

The Modbus Server Simulator is designed to assist developers using the Modbus protocol. All Modbus data are displayed in the Server Simulator and allows debugging of Client applications.

Modbus Server Open Source

The Server Simulator supports Modbus TCP, Modbus UDP and Modbus RTU in the .NET Version.
The JAVA-Version supports Modbus TCP.

The supported Function codes can be disabled. The properties Menu allows to change the Protocol between Modbus TCP; UDP and RTU

Modbus Server Python

The current Values of Discrete Inputs; coils; Holding Registers and Input Registers are displayed, and can be changed.