And here is the situation:-
This design in both software & hardware has been finished about 5-years ago.
And the product has been launched onto the market about 5-years.
And the product has been returned from the customers from time to time within last 5-years. Mainly are RS-485 hardware problem.
1.
>1-!1-node cannot receive signal from the network.
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Solution; Change the RS-485 chip and OK.
2.
>The whole network not working.
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SoSolution; find and isolate the “dead” node and, whole network is working again. The “dead” node working again after the RS-485 had been changed.
3.
>The whole network is “burning”:-
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All the RS-485 chips on the network have temperature (about 45C) after power-up. And after about 3-4 months, almost the RS-485 chips are burning and the whole network is not working.
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Solution:- Again, change all the RS-485 chips and network is working.
4
The hardware design has been and the situation must better.
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Add Tx/Rx auto-switching.
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Add signal isolation.
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Add electricity isolation.
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Disadvantage; too expensive. And not enough node number.
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