A
Alex Pavloff
Hi Curt,
I'd like to point that in your _very own MAT project_, you already _have_ Modbus TCP and RTU code available. There's a few other open source Modbus implementations on the web too. But if the argument is "I'm not going to write any code, because I'm afraid that there's some chance that possibly sometime in the future someone might sue me", I'm not really sure that anything in the open source world would ever have gotten done. Heck, I'm not sure that any software anywhere would ever get done.
I also think that accusing Modicon or Modbus.Org of some nefarious plan to act like SCO and sue everyone for money is rather inflammatory and a baseless claim. Do you any proof that they have plans to do this? Have you discussed these sorts of issue offlist with representatives of Modbus.org?
Heck, if you're so worried about the Modbus click-thru license, spend a couple minutes and find someone to send you the PI-MBUS-300 paper manual, which has no click-thru or shrink-wrap license. There are numerous other manufacturers who have made their own Modbus variations, and documented them separately. I'm sure you could find a manual somewhere describing a protocol that would interoperate with Modbus devices that had absolutely no legal disclaimers anywhere.
(Lynn will then tell you that all specifications save the latest on Modbus.Org are obsolete, and its true, but most of them still seems to do the job <g>).
Alex Pavloff - [email protected]
ESA Technology ---- www.esatechnology.com
------- Linux-based industrial HMI ------
-------- www.esatechnology.com/5k -------
I'd like to point that in your _very own MAT project_, you already _have_ Modbus TCP and RTU code available. There's a few other open source Modbus implementations on the web too. But if the argument is "I'm not going to write any code, because I'm afraid that there's some chance that possibly sometime in the future someone might sue me", I'm not really sure that anything in the open source world would ever have gotten done. Heck, I'm not sure that any software anywhere would ever get done.
I also think that accusing Modicon or Modbus.Org of some nefarious plan to act like SCO and sue everyone for money is rather inflammatory and a baseless claim. Do you any proof that they have plans to do this? Have you discussed these sorts of issue offlist with representatives of Modbus.org?
Heck, if you're so worried about the Modbus click-thru license, spend a couple minutes and find someone to send you the PI-MBUS-300 paper manual, which has no click-thru or shrink-wrap license. There are numerous other manufacturers who have made their own Modbus variations, and documented them separately. I'm sure you could find a manual somewhere describing a protocol that would interoperate with Modbus devices that had absolutely no legal disclaimers anywhere.
(Lynn will then tell you that all specifications save the latest on Modbus.Org are obsolete, and its true, but most of them still seems to do the job <g>).
Alex Pavloff - [email protected]
ESA Technology ---- www.esatechnology.com
------- Linux-based industrial HMI ------
-------- www.esatechnology.com/5k -------