Tektronix Keithley 2281 Series Reference Manual page 168

Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual
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
Vext line
The digital I/O allows connection to an external voltage through a line (V
You can connect to the V
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 exceed +21 V (maximum voltage) on the
digital I/O port. Applying current or voltage exceeding these limits may damage the
instrument.
077114601 / March 2019
(on page 3-29)).
line through the V pin (pin 5) and the specified digital I/O line. Use this
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Section 3: Functions and features
Using SCPI commands
) with a flyback diode clamp.
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3-25