Siemens NK8235

System limits
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Building Technologies 048_DMS_NK8000_ICC_MP4.40_A6V10062437_a_en.doc
Fire Safety & Security Products 06.2011
3.4 NK8231/NK8232/NK8235/NK8237 system limits
Network capabilities (upstream towards management system host)
 2 Ethernet interfaces IEEE 802.3, 10/100 Base-T with auto-negotiation, half/full-
duplex with auto-sensing, auto-crossover (thus eliminating the need for cross-
over cables)
 Single host transport protocols:
 CEI 79-5 type A and B, optional FEAL 64-bit encryption (NK8231, NK8232
and NK8235)
 CMSDL/IP (NK8232 and NK8235)
 BACnet/IP (NK8232 and NK8235)
 Modbus TCP/IP (NK8232, NK8235 and NK8237)
 Multiple hosts (max four hosts combined in total), transport protocols:
 Max. 4 CMSDL/IP (NK8231, NK8232 and NK8235)
 Max. 4 BACnet/IP (NK8232 and NK8235)
 One Modbus TCP/IP (NK8232, NK8235 and NK8237)
 Redundant connectivity to hosts (dual Ethernet), transport protocols:
 CMSDL/IP (NK8232 and NK8235)
 CEI 79-5 type A and B, opt. FEAL 64-bit encryption (NK8232 and NK8235)
 DHCP is currently not supported. A static IP address is required.
 SNMP supported for remote monitoring; NK823x units can provide a basic set
of public information as well as an advanced engineering report.
Serial capabilities (downstream towards subsystems and upstream towards
local management system host)
NK8235: The maximum number of serial lines is 4, allowing connection to up to 4
local units (intrusion, access control, fire, gas detection, CCTV control units). Two
serial lines are available on the mainboard and two on an expansion module. The
serial lines can also be used for a local host, a dial-up host or a Modbus RTU con-
nection to a 3rd party Modbus master device.
Note that the two serial lines on the expansion module (COM3, COM4) do not sup-
port the hardware-handshaking signals for modem control (Rx, Tx, and GND only).
NK8232: The maximum number of serial lines is 2 (on the mainboard). Only one
connection to a local unit (intrusion, access control, fire, gas detection, CCTV con-
trol units) is allowed. The second line can be used for a local host , a dial-up host
or a Modbus RTU connection to a 3rd party Modbus master device.
NK8237: The maximum number of serial lines is 2 (on the mainboard), which can
be used for serial Modbus RTU upstream connections. Only one connection to a
3rd party Modbus master device is supportedNK8231: The maximum number of
serial lines is 2 (on the mainboard). Only one connection to a local intrusion unit is
allowed.
Only one Ethernet interface with CEI 79-5 upstream protocol is supported (no re-
dundant connectivity to hosts).
In all NK823x models, two serial ports can be configured as an RS232-interface
using connector COM1 and COM2, or as an RS485 interface using connectors
X104 and X105.
LON bus connectivity
LON bus connectivity for CS6 Guarto is not supported on NK823x.