4 Structure & function
4.1 NK822x structure
The NK822x is composed of:
A processor board with 2 RS232 serial ports and LAN Ethernet adapter
DIMM-PC / 520-I module with 32MB RAM, 32MB Flash disk
Real Time Operating System (RTOS) with integrated IP protocol stack
Optional 2 RS232 ports add-on board (NK8223 / NK8225 only)
Optional PC/104 LON add-on board
Optional external I/O module(s) (16 in /8 out)
Optional external power supply supervision module
Fig. 10 NK822x CDI-Ethernet port
4.1.1 NK822x internal hardware
The euro-size processor board is equipped with a DIMM-PC module, 2 RS232 se-
rial lines, LAN and diagnostic LED's.
Fig. 11 NK822x internal hardware – main board
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