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
A6V10733786_en_c 163 | 170
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