Siemens NK8223 - Page 29

HW Installation
29
Building Technologies 007798_g_en NK8000 ICC.doc
Fire Safety & Security Products 06.2006
Characteristic Bus topology Free topology
Max. cable length (UTP Cat.4) [m] 1’400 500
Termination
2  100, 1/8W
at each end of segment
1  50, 1/8W
at center of segment
Max. number of nodes per segment 64
Max. number of repeaters 4
Polarity insensitive Yes
NK822x has a built-in termination resistor (100Ù) for a doubly terminated bus to-
pology that can be enabled by closing the internal jumper JP6.
 See Fig. 12 p. 21, and section 4.1.6 p. 22.
i
Please refer to the Echelon Manual for detailed specification on how to set up a LON
network: http://www.echelon.com/Support/documentation/
Section: Engineering Bulletins → Media & Wiring
CN4: COM 1 RS485 connector
CN4 RS485 connections
Pin Assignment
1 + RS485
2 - RS485
COM 1 … COM 4: RS232 connectors
RS232 lines are connected to 9pin D-Sub connectors, female type
Pin Assignment
1 CD
2 RXD
3 TXD
4 DTR
5 GND
6 DSR
7 RTS
8 CTS
9 RI
DIN Rail installation
The modules are supplied in a plastic box that can be easily attached to the DIN
rail by hooking it on the top of the rail and pressing it in on the opposite side. To
detach the box, pull downward on the tab located at the rear of the module. The I/O
modules are mounted the same way.
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Before removing the box, carefully disconnect the flat cable (bus) of the I
2
C mod-
ule, as well as the power supply cables.
I
2
C interface
Fig. 19 NK822x I
2
C bus addresses
I
2
C address settings:
Addr. 8 Addr. 1 Addr. 2 Addr. 1
(Factory setting)