NK823x Structure and Functions
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Building Technologies 048_DMS_NK8000_ICC_MP4.40_A6V10062437_a_en.doc
Fire Safety & Security Products 06.2011
Fig. 9 NK823x internal DIP switch and jumpers (NKM8001-A2 mainboard)
5.4 Serial interfaces
NK8231.2, NK8232.2, NK8235.2 and NK8237.2: These models are equipped with
two serial lines available on the NK823x main board.
NK8235.4 is equipped with 4 serial interfaces (two on the main board and two on
an expansion module).
In all NK823x models, the first and the second serial port can be configured as an
RS232 interface using connector COM1 and COM2, or as an RS485 interface
using connectors X104 and X105.
All lines are fully RS232 compliant and have EMC/ESD protection.
NK8235.4: COM3 and COM4 do not support the hardware-handshaking signals for
modem control (Rx, TX, and GND only).
No galvanic isolation is provided; all serial lines have a common ground.
5.5 LON interface
The NK823x Ethernet Ports do not have a LON interface and do not support CS6
Guarto intrusion detection systems (use NK822x instead).
5.6 Onboard I/O
The NK823x main board is equipped with three digital inputs (X102) and one relay
output (X101). The input signals can be used individually or combined together for
power supply supervision application.
X111
X104
X3
X103
S2: Tamper switch S1: Reset button
X2
X1
X101
X102
X105
S101: DIP-Switches
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