SDN
Shutdown register
Description
Note: AC fail always
resets the load
This command provides access to the Shutdown register. The bits in
this register define which bits of the Condition (CON) register will
cause the load to shutdown. Setting one bit by writing its bit weight
into the SDN register enables its equivalent bit in the CON register.
The individual bits are defined below. More than one bit can be
enabled by writing a value that is a sum of the individual bit
weights. The Over Voltage and Over Temperature bits in this
register will remain set regardless of what value is written to this
register.
Bit
Weight
Description
Text On Response
Message
Default
Value
7
128
Under Voltage
UV
0
6
64
Over Voltage
OV
1
5
32
Over Temperature
OT
1
4
16
Minor Fault
MINOR FAULT
0
3
8
Over Current
OC
0
2
4
Over Power
OP
0
1
2
Saturation
SAT
0
0
1
Minor Fault
MINOR FAULT
0
The query form of this command will either return a numeric or a
text response depending on the TEXT ON/OFF and STATXT
ON/OFF settings. The text response will return a string containing
the Text On Response Message as listed in the table above for each
bit that is set. These will be separated by commas. If no bits are set
“CLEAR” will be returned.
Command Syntax
SDN <NR1>
Example
SDN 12
This will write the value of 12 into the SBE register. This enables
bit 2 (Over Power) and bit 3 (Over Current) in the CON register so
that if either becomes set the load will shutdown. Since the Over
Voltage and Over Temperature bits remain unaffected these will
remain enabled. Therefore the value in the SDN register after this
command will be 108.
Related Query
SDN?
Returned Parameters
TEXT ON and STATXT ON: <text response string>
TEXT OFF or STATXT OFF: <NR1>
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