Basic Documentation

Functions
Modbus RTU mode
4
46 | 66
A6V12114068_en--_c
The table below shows error codes and default alarm texts.
Priorities
Fault
Thermostat
Fault information on Modbus
Display
Error code
Default fault text
-
No fault
---
0
No fault
1
(RDF660MB only)
Condensation
COND
4930
Condensation in the
room
2
(RDF660MB only)
External fault input X1
AL1
9001
Fault input 1
3
(RDF660MB only)
External fault input X2
AL2
9002
Fault input 2
4
Clean filter reminder
FIL
3911
Dirty filter
Default alarm texts are stored in the thermostat’s non-volatile memory and can be
adjusted using the Modbus commissioning tool.
4.11.2 Receive timeout
In a Modbus network, RTU Mode communication objects can be exchanged
between individual devices. The "Receive timeout "defines the time period within
which all communication objects requested from a device are received at least
once. If a communication object is not received within this period, a predefined
value is used.
Fixed time is specified as follows:
● Receive timeout: 31 minutes
Object [Modbus obj. no.]
I/O
Minutes
Default value
SYS Protection [67]
Receive
31
Protection
Room operating mode:
Preselection [66]
Comfort
Economy
Protection
Receive
31
Comfort
Room operating mode: Window
state [71]
Receive
31
Close
Room operating mode:
Presence detector [72]
Receive
31
Inactive
Room operating mode: Keycard
[73]
Receive
31
Inactive
Heating/cooling changeover [74]
Receive
31
Cooling
Note
RTU Mode