<![CDATA[Problem testing Modbus IP Data Source]]>I've created a modbus IP data source and data point.
I'm also running this server in localhost:502 http://code.google.com/p/modbus-tk/source/browse/trunk/examples/tcpslave_example.py

If I use th scan nodes feature, Mango successfully finds the single slave in the server. But if I create a Data point for the slave 1 no data is recorded in Mango and no output appears in the server stdout.

Am I missing something? This is supposed to work.

]]>https://forum.mango-os.com/topic/366/problem-testing-modbus-ip-data-sourceRSS for NodeThu, 05 Mar 2026 07:50:06 GMTTue, 13 Apr 2010 17:50:45 GMT60<![CDATA[Reply to Problem testing Modbus IP Data Source on Wed, 14 Apr 2010 15:00:59 GMT]]>Seems I cant capture traffic in the loopbak interface http://wiki.wireshark.org/CaptureSetup/Loopback

]]>https://forum.mango-os.com/post/3607https://forum.mango-os.com/post/3607Wed, 14 Apr 2010 15:00:59 GMT<![CDATA[Reply to Problem testing Modbus IP Data Source on Wed, 14 Apr 2010 14:36:07 GMT]]>Wireshark?

]]>https://forum.mango-os.com/post/3606https://forum.mango-os.com/post/3606Wed, 14 Apr 2010 14:36:07 GMT<![CDATA[Reply to Problem testing Modbus IP Data Source on Wed, 14 Apr 2010 14:28:32 GMT]]>Is there a way to test if Mango is sendign the modbus ip pabkets over the net?

]]>https://forum.mango-os.com/post/3605https://forum.mango-os.com/post/3605Wed, 14 Apr 2010 14:28:32 GMT<![CDATA[Reply to Problem testing Modbus IP Data Source on Tue, 13 Apr 2010 19:12:16 GMT]]>Sorry, i can't help much. I've never used that toolkit. But using the Modbus4J listener test i was able to successfully connect, read and write. Are you sure you're using the right register values?

]]>https://forum.mango-os.com/post/3604https://forum.mango-os.com/post/3604Tue, 13 Apr 2010 19:12:16 GMT<![CDATA[Reply to Problem testing Modbus IP Data Source on Tue, 13 Apr 2010 18:50:31 GMT]]>Tried it, but same result: none.

In the Python script I dont see any request from Mango. I did see it while using the "Search for nodes" feature.

]]>https://forum.mango-os.com/post/3603https://forum.mango-os.com/post/3603Tue, 13 Apr 2010 18:50:31 GMT<![CDATA[Reply to Problem testing Modbus IP Data Source on Tue, 13 Apr 2010 17:56:27 GMT]]>Note that registers in Mango are 0-indexed. Modbus documentation is sometimes 1-index. Try subtracting 1 from your register and see if that works.

]]>https://forum.mango-os.com/post/3602https://forum.mango-os.com/post/3602Tue, 13 Apr 2010 17:56:27 GMT