<![CDATA[ModBus only write register - datapoint]]>My customer has device with holding register with "WriteOnly" flag. I can write value into this register, but reading from this register cannot be applied - "Illegal address error".

I wish small checkbox for "exclude" datapoint from periodically reading process.

Sorry for my English.

]]>https://forum.mango-os.com/topic/577/modbus-only-write-register-datapointRSS for NodeFri, 13 Mar 2026 11:26:02 GMTThu, 14 Oct 2010 11:49:01 GMT60<![CDATA[Reply to ModBus only write register - datapoint on Thu, 02 Dec 2010 13:53:27 GMT]]>Thank you M2MSanta :)

]]>https://forum.mango-os.com/post/5049https://forum.mango-os.com/post/5049Thu, 02 Dec 2010 13:53:27 GMT<![CDATA[Reply to ModBus only write register - datapoint on Fri, 26 Nov 2010 20:47:40 GMT]]>This has been added to Mango M2M2, currently in alpha.

]]>https://forum.mango-os.com/post/5026https://forum.mango-os.com/post/5026Fri, 26 Nov 2010 20:47:40 GMT<![CDATA[Reply to ModBus only write register - datapoint on Mon, 08 Nov 2010 15:15:31 GMT]]>Yes, I already use this workaround, but I wish .... :lol:

]]>https://forum.mango-os.com/post/4875https://forum.mango-os.com/post/4875Mon, 08 Nov 2010 15:15:31 GMT<![CDATA[Reply to ModBus only write register - datapoint on Mon, 08 Nov 2010 14:24:28 GMT]]>Oja,
I've the same problem with a genset controller, and i've found a walk around:

  • Create a new data source for your modbus slave with just one point (the write only register) and without slave monitor points.
  • Disable point read exception alarms
  • Use an update period of 9999999 hours (it'll bother just at first update, never alarm again 'cause next update will be at 10 years ;))

You need to create a new data source because you need to receive point read exception alarms from all the other read and read/write points on your modbus slave.

Best regards,

David Parra

Attachment: download link

]]>https://forum.mango-os.com/post/4873https://forum.mango-os.com/post/4873Mon, 08 Nov 2010 14:24:28 GMT