C Interval For Data Transfer Via Lon - Viessmann VITOTRONIC 200 Service Instructions Manual

7798 LON system number
The addresses of LON subscribers consist of three dif-
ferent parts, as in a telephone network (country code,
area code, subscriber number).
The first part is permanently set to the same value for
all Viessmann appliances. The other parts consist of
the LON system number and LON subscriber number.

779C Interval for data transfer via LON

Receive interval for the values and messages transmit-
ted via LON.
If no signal is received for a magnitude or message
within this set period, the control unit sets this value or
status to an internal preset until the signal is received
again.
77FC Source outside temperature
The heat pump control unit can receive the outside
temperature from different sources.
Value Meaning
"0" The heat pump control unit captures the out-
side temperature via the outside temperature
sensor connected to the controller and sensor
PCB.
"1" The heat pump control unit receives the out-
side temperature from another LON subscrib-
er with the same system number ("LON sys-
tem number 7798").
Note
Only one subscriber within a system in LON
may send the outside temperature.
77FD Send outside temperature
To ensure that all LON subscribers use the same out-
side temperature, the heat pump control unit can trans-
mit this value to other LON subscribers.
Note
Only one subscriber within a system in LON may send
the outside temperature.
77FE Source time
!
The heat pump control unit can receive the time from
different sources.
!
(cont.)
Setting is system number.
!
Setting in min
!
Value
"2"
"3"
!
Value
"0"
"1"
Value
"0"
Parameter group Communication
Meaning
The heat pump control unit receives the out-
side temperature from an external device via
KM BUS, e.g. wireless base station.
Do not set.
Meaning
Outside temperature is not sent.
The heat pump control unit transmits the out-
side temperature in LON. All LON subscribers
with the same system number can receive
this value ("LON system number 7798").
Meaning
The heat pump control unit uses the time
from the internal clock.
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