Serial Interfaces; Onboard I/O - Siemens NK8237 MP4.81-02 Installation, Configuration And Commissioning

6.1.4
6.1.5
Building Technologies
CPS Fire Safety
1
X1 X2
Internal DIP switch and jumpers (NKM8001-A2 mainboard)
Item Name
1 S101
2 S1
3 S2
4 X115

Serial interfaces

The NK8237.2 model is equipped with two serial lines available on the main board.
The 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.
No galvanic isolation is provided; all serial lines have a common ground.

Onboard I/O

The NK823x main board is equipped with three digital inputs (X102) and one relay
output (X101).
The relay output can be used for reporting a faulty communication detected by a
watchdog timeout expiration (see General gateway parameters [➙ 54]).
Structure and functions
2
X3 X101 X102
Description
DIP-Switches
Reset button
Tamper switch
When closed, it disables the box tamper alarm.
4
NK8237 hardware
3 4
X103 X104 X105
X111
19
A6V10854379_a_en
25.01.2019