45
To check the communication between the heat pump
control unit and connected LON subscribers.
Requirements:
■
Heat pump control unit is
fault manager
(
"LON fault
manager 7779"
).
■
A unique subscriber number is set for every connec-
ted subscriber (
"LON subscriber number 7777"
).
■
The LON subscriber list in the fault manager is up to
date.
1. Service menu:
Press and hold
OK
+
å
simultaneously for
approx. 4 s.
2. "Service functions"
3. "Subscriber check"
4.
Select LON subscriber.
5.
Start the subscriber check with
OK
.
Possible displays:
■
No display (status unknown):
LON subscriber has not yet responded, but has not
yet been identified as failed.
■
"Failed"
:
LON subscriber has not responded for more than
20 min (
"Interval for data transfer via LON 779C"
).
■
"Check"
:
Displayed for the duration of the subscriber check.
"WINK"
flashes on the display of the selected LON
subscriber for around 30 s.
■
"Check OK"
:
Successful communication between the heat pump
control unit and the LON subscriber
■
"OK"
/
"Fault"
:
LON subscriber has responded. Everything is OK or
the LON subscriber has a fault.
■
"Check ERR"
:
No communication between the heat pump control
unit and the LON subscriber.
Check the LON connection and LON parameters.
Subscribers (Modbus/KM-BUS)
List of all subscribers connected to the control unit via
Modbus or KM-BUS. The connection parameters for
each subscriber can be displayed.
1. Service menu:
Press
OK
+
å
simultaneously and hold for
approx. 4 s.
2. "Service functions"
3. "Modbus1 subscriber"
: Subscriber list with con-
nection status for devices connected via X18 on
the controller and sensor PCB.
"Modbus2 subscriber"
: Subscriber list with con-
nection status for devices connected via
sVA
on
the controller and sensor PCB.
"KM-BUS subscriber"
: Subscriber list with con-
nection status for devices connected via KM-BUS.
4.
Select subscriber and display connection parame-
ters with
OK
.
Example for
"Modbus1 subscriber"
Back with
Refrigerant circ controller
Fault code
Status
Subscriber add.
30
Baud rate/parity
19200/Even
0K
0x00
Timeout counter
12
Fig. 22
Connection parameters
Modbus
KM-BUS
"Subscriber add."
Modbus 1:
Predetermined for each subscriber
Modbus 2:
Allocated when the subscriber is
commissioned.
Predetermined number of the KM-BUS
subscriber
"Baud rate/parity"
Speed of the data transfer (symbols/
second)/parity (even/odd/none)
―
"Device group"
―
Type of KM-BUS subscriber
"Status"
Connection status (
"OK"
,
"Fault"
)
Service functions
LON subscriber check
5800 917 GB
Parameter
