Siemens NK8237 MP4.40 - Page 18

Hardware Installation
18
Building Technologies
048_DMS_NK8237_ICC_MP4.40_A6V10316241_a_en.doc
Fire Safety & Security Products 06.2011
27Ah 12V
Vin = Voltage In
Vout = Voltage Out
Batt = Battery
Fig. 10 NK8237 power supply
Caution! There is a risk of explosion if the battery is replaced with an incorrect
battery type. Use 27Ah 12V batteries. Dispose of the used battery at a recycling
point in accordance with local environmental standards and regulations.
X103: Power supply
Power and LON connections
Pin Assignment
1 + PWR 1
2 Earth
3 – PWR 1
4 Not used
5 Not used
6 + PWR 2
7 Earth
8 – PWR 2
X2/X3: Ethernet connector
A standard RJ45 connector connects Ethernet. Cat.5 UTP cabling is best suited.
Pin Assignment
1 TX +
2 TX –
3 RX +
4 n.c.
5 n.c.
6 RX –
7 n.c.
8 n.c.
Power supply connection
Note the dual power supply input for redundant solutions