2.3 NK822x system limits
Network capabilities (upstream towards management system host)
⚫ Ethernet IEEE 802.3, 10Base-T, half-duplex, no auto-sensing or auto-
negotiation
⚫ Single host transport protocols:
– CEI 79-5 type A and B (optional FEAL 64-bit encryption)
– CMSDL/IP
– BACnet/IP (NK8225 only)
⚫ Multiple hosts (up to four) transport protocols:
– CMSDL/IP
– BACnet/IP (NK8225 only)
⚫ DHCP is currently not supported. A static IP address is required.
Serial capabilities (downstream towards subsystems and upstream
towards local management system host)
NK8223/NK8225: 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 CPU module and two on an expansion
module. The serial lines can also be used for a local host or a dial-up host
connection.
NK8222: The maximum number of serial lines is 2 (on the CPU module). Only one
connection to a local unit (intrusion, access control, fire, gas detection, CCTV
control units) is allowed. The second line can be used for a local host or a dial-up
connection.
In all NK822x models, the first serial port can be configured as an RS232-interface
using connector COM1 or as an RS485-interface using connector CN4.
Interaction capabilities
NK822x provides programmable interaction programs, including single or multiple
triggers (incoming events) and single or multiple effects (outgoing control actions).
Interactions are possible between locally connected subsystems.
The NK8225 can provide network-wide interaction capabilities between other
BACnet NK82xx units.
⚫ Subsystems supported (see Interactions [➙ 12]).
⚫ Logical combinations: AND, OR, XOR, NOT
⚫ Delay of effects (wait): configurable 0…6500 sec.
⚫ Max. # of typical interactions (1-6 triggers, 1-4 effects): 500
⚫ Total # of field points used in triggers/effects: 5000
⚫ Max. # of field points/interactions that can be combined in a trigger expression:
255
Modules locally connected via I
2
C
⚫ Up to 16 digital inputs (2 DF8040 modules)
⚫ Up to 8 digital outputs (1 DF8020 module)
⚫ Power supply supervision (1 DF8090 module)
Further input/output modules can be connected over the serial lines.
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