Serial Interfaces; Lon Interface; Pc/104 Lon Adapter - Siemens NK8222 Installation, Function & Configuration

4.4

Serial interfaces

4.5

LON interface

4.5.1

PC/104 LON adapter

Building Technologies
Fire Safety & Security Products
NK8223 / NK8225
Although the maximum number of serial lines is 4, they are not always used. There
are two serial lines available on the base module and two on an expansion module.
NK8222
This model is equipped with two serial lines only available on the base module.
In all modules, the first serial port can be configured as an RS232 interface using
connector COM1 or as an RS485 interface using connector CN4.
All lines are fully RS232 compliant and have EMC/ESD protection.
No galvanic isolation is provided; all serial lines have a common ground.
The NK822x processor board is equipped with a standard PC/104 interface for sys-
tem expansion. This is used for the LON add-on board.
There are two revisions of LON interface boards, which have different LED indica-
tions and different rotary switch settings.
Before checking the LEDs or setting the physical LON address with the rotary
switch, check the revision of the board you are using.
The 8-digit code (CD00251A or CD00251B) can be found on the rear of the inter-
nal board in the upper left corner.
On the top of the NK822x module there are five LED's and 1 push button, which
indicate the following: (see Tab.4 below).
Fig. 3 NK822x LON board diagnostic LEDs
NK822x Structure and Functions
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06.2011