TDI-Dynaload Division
WCL488 Series Water Cooled Electronic Loads
Operation & Programming Manual
402828, Rev. B1
Page 77
SDN Shutdown register
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
—
—
0
3
8
Over Current
OC
0
2
4
Over Power
OP
0
1
2
Saturation
SAT
0
0
1
Module Fault
MOD FLT
0
Description
The query form of this command will either return a numeric or a
text response depending on the TEXT ON/OFF setting. 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: <text response string>
TEXT OFF: <NR1>