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Building Technologies Basic documentation: Communication via the KNX bus CE1P3127en
HVAC Products Basic communication settings 30.08.2007
Rem set clock slave: Yes The time slave transmits the remote time and/or date
settings to the time master. The time master transmits the
values received to all time slaves (including any remotely
adjustable slave(s)
Rem set clock slave: No Time slaves with this setting can only receive the time
and date from the time master.
All time slaves can operate with the default setting "Rem set clock slave: Yes".
However, it is also possible for only one
time slave (or none) to operate with this
value.
Sends the
remotely set
time of day:
10:24
Receives:
10:24
Clock time operation:
Master
Clock time operation:
Slave
Rem set clock slave: Yes
Clock time operation:
Slave
Clock time operation:
Autonomous
3127Z38en
Has its own
time of day
Remotely set
time of day: 10:24
Receives:
10:24
Time day for
timer function
Receives:
10:24
For its timer functions, the QAW740 room unit requires the time from the time
master. It can receive the time over the KNX bus subject to the following criteria:
• A bus device must be defined as the time master (setting "Clock time op:
Master").
• The QAW740 room unit is connected to an RM… controller via a "Geogr zone
(apartm)". For communication and filtering purposes (see section 8.2) the time
master and the room unit should preferably be in the same "Geogr zone
(apartm)". However, this is not mandatory.
• The room unit must have received the time from the time master. Note: The time
master transmits the time only every 10 minutes.
QAW740
Uhrzeit
RM..
RM..
3127Z26en
Time of day
Room unit receives
time of day for timer
function
Clock time operation:
Slave
Clock time operation:
Master
Geogr zone: 5 Geogr zone: X
Geogr zone: 5
Time of day Time of day
Settings
Note
Example
Time in the
QAW740 room unit
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