Siemens Climatix S300 HRV, Application Manual

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Status flags:
● Read only bitset with BACnet encoding of status flags
'In-Alarm', 'Fault', 'Overridden' and 'Out-of-Service' in case of Modbus read
response.
● Void field (0;0;0;0) in case of Modbus write request to be
ignored by the Modbus Slave BA adapter.
b3 b2 b1 b0
Status flags
● b0: In Alarm
● b1: Fault
● b2: Overridden
● b3: Out of service
Status flag is an exception, see table below with a comparison on parameters read
from Modbus and BACnet.
Object and property Comparison
O&M
basic Present value Same value
extend
Present value Same value
status flag Bit swapped
priority Same value
reliability Same value
Device
System-Status Same value
(0:operational;
2:download required)
Same value
Local-Date Same value
Local-Time Same value
Equipment-ID Same value
Serial-Number Same value
Model-Information Same value
Firmware-Revision Same value
Application-Software-
Version Same value
Supported-Languages Same value
MODBUS-Session-
Language Same value
Schedule
Entry Same value
Schedule default Same value
present value Same value
status flag Bit swapped
reliability Same value
● Cmd: Multistate command in combination with priority field (for BA output
objects and process value objects only) for commanding / writing present value
– Cmd = 0: Ready
– Cmd = 1: Command new value
– Cmd = 2: Relinquish
Engineering of communicative devices
Modbus slave
6
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