Hitachi PSC-A1T Technical Catalogue

7 Gateways for building management systems
KNX001
TCGB0106 rev.0 - 12/2014
653653
7
Each of the previous signals must be associated with an address of Group KNX, so that the whole set behaves
as one more part of the KNX system with the same conguration and operation characteristics.
EIB
KNX
KNX001
Ethernet
CSNET WEB
IU
H-Link
IU
IU
HGT
Conguration Soft-
ware
RS232
Only during conguration
EIB
KNX001 performs continuous polling (reading) of all the signals congured in CSNET WEB and keeps their status updated
in order to serve as information to the KNX system.
When a change of status is detected in a signal, a written message is sent to the KNX bus of the associated KNX Group.
When a written message is received from the KNX bus to a KNX Group that is associated with the signal, the correspond-
ing message is sent immediately to CSNET WEB so that is can perform the appropriate action.
In the initial process after start-up of KNX001, a search is performed for the congured units (machines). If no unit is de-
tected, this is indicated by the communication error signal associated with each unit.
7.3.4.2 Limitations
Element Maximum Notes
No. Packaged 128 No. IU A/C
No. KNX Groups 5920 Total no. of KNX Groups that can be used in KNX001
No. Listening addresses 1000 No of KNX groups that can be used as listening addresses
No. Listening addresses per KNX Group 255 No. listening addresses that can be associated with a KNX group
7.3.4.3 The KNX System
This section gives a general description of the KNX perspective.

Description
KNX001 is connected directly to the KNX bus, and behaves as one more part of the KNX system with the same congu-
ration and operation characteristics.
Internally, the electronic circuit that is connected to the KNX bus is optoisolated from the power supply and from the rest
of the equipment’s electronics.
KNX001 receives, manages and sends all the messages from the KNX bus that refer to its conguration and operation.
On receiving messages sent to addresses of the KNX group, it sends the corresponding messages to CS-NET-WEB, in
order to keep both systems synchronized.
When a change in the signal from CSNET WEB is detected, the message is sent to the KNX bus of the associated KNX
group address, in order to keep both systems synchronized.
The status of the KNX bus is checked continuously. If loss of bus is detected, due for example to a power failure in the
KNX bus, when the KNX bus is restored KNX001 will detect it and will perform the Updates of the groups marked with
this property, i.e. it will make read requests for the group addresses. This behaviour can be disabled.

Hitachi PSC-A1T Specifications

General

Brand	Hitachi
Model	PSC-A1T
Category	Controller
Language	English