Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual
Section 3: Functions and features
077114601 / March 2019
3-25
When you place a line in the Digital Out function, you can continue to select the actions. The level of
the line will change when the condition of the action is met. The actions and conditions are:
Sink<>Source:
The instrument changes from source mode to sink mode, or conversely from sink
mode to source mode.
Hi V
and
Low V:
The instrument terminal voltage is higher or lower, respectively, than the
settings in Limit trigger.
CC<>CV:
The instrument switches between CC and CV mode.
End:
The instrument now meets the charge or discharge end condition.
Full
and
Empty:
Charging the battery simulator to a full voltage setting and discharging it until it
is empty, respectively.
When you place a line in the Digital In function, there are certain actions you can choose.
Output on
and
Output off
indicate setting the output to on or off, respectively.
Script Start
and
Script Stop
mean controlling the script test to start and stop.
You can select the level signal variation for the Digital Out and Digital In to either
RISE
or
FALL
or
HIGH
or
LOW
depending on the action. Rise and fall variations trigger only once; high and low
variations follow the state of the condition. For example, the Sink<>Source action has rise and fall
variations, so when the 2281S switches from source to sink, or conversely from sink to source, the
state of the trigger line changes and does not change back. The Hi V action has high and low
variations, so when the Hi V condition is met, the state of the line changes. When the Hi V condition is
no longer met, the state of the line changes back.
When you place a line in the manual output high state, the line is set to logic high (+5 V). Each output
line can source up to 2 mA.
When you place a line in the manual output low state, the line is set to logic low (0 V). Each output
line can sink up to 50 mA.
You can read the line status over a remote bus using SCPI commands (see
to configure digital I/O lines
(on page 3-29)).
Vext line
The digital I/O allows connection to an external voltage through a line (V
ext
) with a flyback diode clamp.
You can connect to the V
ext
line through the V
ext
pin (pin 5) and the specified digital I/O line. Use this
connection to drive relay coils, a low power solenoid, or similar external inductive circuitry. The
externally supplied voltage can be up to +21 V.
Do not apply more than 50 mA (maximum current) or 21 V (maximum voltage) on the
digital I/O port. Applying current or voltage exceeding these limits may damage the
instrument.
