Can monitoring Modbus TCP PtP(Point to Point)

Our customer have one Master is HMI and Master IO, they work with Modbus TCP PtP. Now i want to monitor the packages RFQ from master and reponse from Slave(Master IO) and use these data to DAQ of my customer. Please offer me how to do that.

With IO Ninja, you can monitor Modbus TCP, analyze communications, and export data for further processing.

However, there's no out-of-the-box integration with data acquisition services.

If it's the monitor-and-analyze part you are interested in, then the roadmap is as follows.

The first stage is to acquire the TCP conversation between Modbus Master and Modbus Slave. In IO Ninja, this can be done via two alternative approaches.

(a) You can capture Ethernet packets using Ethernet Tap or Pcap Sniffer (capturing via Pcap could require some trickery if the Modbus Master is not running on the same workstation as IO Ninja), then reconstruct TCP conversation by attaching TCP Flow Analyzer.

(b) But a more straightforward approach would be to use IO Ninja as a man-in-the-middle and let it forward TCP traffic between the Master and Slave using TCP Proxy. Whenever this man-in-the-middle approach is applicable (i.e., you are in control of the Master and can redirect it to IO Ninja), that should be your choice -- it's much more straightforward and reliable.

After you set everything up for reconstruction of the raw TCP conversation between Master and Slave, you attach the Modbus Analyzer to decode the raw bytes into human-readable Modbus frames.

IO Ninja log is very powerful and should be more than enough to inspect and analyze the Modbus conversation.

If you need to post-process it further, one option would be to create a Log Layer to do the job (remember, IO Ninja is scriptable!). However, for people who have never touched IO Ninja scripting before, a much more straightforward path would be to save the log as .njlog and use any scripting language of their choice to walk over it.

The .njlog file format is very simple and all the relevant data structures & constants are open-source and defined in scripts/api/log_RecordCode.jnc and scripts/api/log_RecordFile.jnc (included in IO Ninja packages).

Hope this helps; feel free to follow up with any questions!