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When using iLON 10 Ethernet adapter for communication you should realize that the communication processor of this device (Neuron 3120) has relatively short default buffers (network buffer is 66 bytes. Therefore it does not receive the longer packets. It can be seen in the web interface iLON 10 - tab Status and the parameter Missed Messages increases when trying to read the value (e.g. always after saving the I/O tag if its parameter Subscribe/read is marked). This problem occurred when schedule of scheduler contained more than 4 pairs time-value. When there were 4 pairs, the length of LON message was 63 bytes. After adding next pair via PXM20, the loading of schedule failed.
Warning! The utility Nodutil NodeUtil enables to increase the size of received packet by increasing of both the network and application buffer. However, if you set improper values, you can damage iLON 10 device (Neuron 3120 stopped communication with the user processor).
If you decide to preset the size of buffers, just change it from 66 bytes to 88 (and reduce the number of buffers) because KOM process informs, in its packets, that it is able to receive 50-byte ASDU (+ BACnet header 3 bytes and LON header 16 bytes).
The buffers of PCLTA-10 ISA adapter (built on the communication chip Neuron 3150) had the long enough buffers (255 bytes).
After we bought the new iLON 10, the configuration was successful with these parameters:
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