Keithley 2657A, Reference Manual, Page: 664 / 805

Model 2657A High Power System SourceMeter® Instrument Reference Manual Section 7: TSP command reference
2657A-901-01 Rev. B/December 2012 7-351
The setting for
mode
can be one of the following values:
Mode Number
value
Description
tsplink.TRIG_BYPASS 0 Allows direct control of the line as a digital I/O line.
tsplink.TRIG_FALLING 1 Detects falling-edge triggers as input. Asserts a TTL-low pulse
for output.
tsplink.TRIG_RISING 2 If the programmed state of the line is high, the
tsplink.TRIG_RISING
mode behaves similarly to
tsplink.TRIG_RISINGA
.
If the programmed state of the line is low, the
tsplink.TRIG_RISING
mode behaves similarly to
tsplink.TRIG_RISINGM
.
Use
tsplink.TRIG_RISINGA
if the line is in the high output
state.
Use
tsplink.TRIG_RISINGM
if the line is in the low output
state.
tsplink.TRIG_EITHER 3 Detects rising- or falling-edge triggers as input. Asserts a
TTL-low pulse for output.
tsplink.TRIG_SYNCHRONOUSA 4 Detects the falling-edge input triggers and automatically
latches and drives the trigger line low.
tsplink.TRIG_SYNCHRONOUS 5 Detects the falling-edge input triggers and automatically
latches and drives the trigger line low. Asserts a TTL-low pulse
as an output trigger.
tsplink.TRIG_SYNCHRONOUSM 6 Detects rising-edge triggers as an input. Asserts a TTL-low
pulse for output.
tsplink.TRIG_RISINGA 7 Detects rising-edge triggers as input. Asserts a TTL-low pulse
for output.
tsplink.TRIG_RISINGM 8 Edge detection as an input is not available. Generates a
TTL-high pulse as an output trigger.
When programmed to any mode except
tsplink.TRIG_BYPASS
, the output state of the I/O line is controlled by
the trigger logic, and the user-specified output state of the line is ignored.
When the trigger mode is set to
tsplink.TRIG_RISING
, the user-specified output state of the line is
examined. If the output state selected when the mode is changed is high, the actual mode used will be
tsplink.TRIG_RISINGA
. If the output state selected when the mode is changed is low, the actual mode used
will be
tsplink.TRIG_RISINGM
.
mode
stores the trigger mode as a numeric value when the attribute is read.
To control the line state, use the
tsplink.TRIG_BYPASS
mode with the
tsplink.writebit()
and the
tsplink.writeport()
commands.
Example
tsplink.trigger[3].mode =
tsplink.TRIG_RISINGM
Sets the trigger mode for
synchronization line 3 to
tsplink.TRIG_RISINGM
.