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| 4/17/2013 11:03 AM | |
Joined: 1/17/2007 Last visit: 3/10/2025 Posts: 1557 Rating:
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Obviously, converting the panel relays to TCP would be the ideal solution. That will give you the best update speeds and also avoid the need for external 3rd party hardware / software needed for the convertor. But as you say, it will be expensive. You also have to consider the rewiring / recomissioning time, and the possibility of introducing problems on a currently working system (having to change the panel relays). I have used TCP/RTU convertors in the past (namely the DR XPress IAP convertor from Lantronix). Once configured, this device was very reliable. As stated above, you will need additional software to configure the device. The device will also need the modbus firmware loading before it can be used. The configuration software and firmware are downloadable from the Lnatronix site free of charge. The configuration software is very easy to use and it is childs play to set it up. Obviously, the update speeds for the communications will be compromised somewhat due to the time needed to perform the TCP <--> RTU conversion, and the slower speed of the RTU (serial) interface. This delay will largely be dependant on how much data is going over the interface. The number of telegrams (polls) will also have a bearing on this as there will be a time overhead for each transaction. The final decision comes down to a cost / time / risk analysis. You are the best judge on which way to go. I hope my advice aids this decision. Good luck. |
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Programming today is the race between software engineers building bigger and better idiot proof programs, and the universe producing bigger and better idiots. |
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