Keithley 2651A Reference Manual

Section 7: Command reference Model 2651A High Power System SourceMeter® Instrument Reference Manual
7-46 2651A-901-01 Rev. A / March 2011
digio.trigger[N].mode
This attribute sets the mode in which the trigger event detector and the output trigger generator operate on the
given trigger line.
Type TSP-Link accessible Affected by Where saved Default value
Attribute (RW) Yes Instrument reset
Digital I/O trigger N reset
Not saved digio.TRIG_BYPASS
Usage
triggerMode = digio.trigger[N].mode
digio.trigger[N].mode = triggerMode
triggerMode
The trigger mode; see Details for values
N
Digital I/O trigger line (1 to 14)
Details
Set triggerMode to one of the following values:
Trigger mode values
triggerMode
Description
digio.TRIG_BYPASS or 0
Allows direct control of the line.
digio.TRIG_FALLING or 1
Detects falling-edge triggers as input; asserts a TTL-low pulse for
output.
digio.TRIG_RISING or 2
If the programmed state of the line is high, the
digio.TRIG_RISING mode behaves similar to
digio.TRIG_RISINGA. If the programmed state of the line is low,
the digio.TRIG_RISING mode behaves similar to
digio.TRIG_RISINGM. This setting should only be used if
necessary for compatibility with other Keithley Instruments products.
digio.TRIG_EITHER or 3
Detects rising- or falling-edge triggers as input. Asserts a TTL-low
pulse for output.
digio.TRIG_SYNCHRONOUSA or 4
Detects the falling-edge input triggers and automatically latches and
drives the trigger line low. Asserting the output trigger releases the
latched line.
digio.TRIG_SYNCHRONOUS or 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.
digio.TRIG_SYNCHRONOUSM or 6
Detects rising-edge triggers as input. Asserts a TTL-low pulse for
output.
digio.TRIG_RISINGA or 7
Detects rising-edge triggers as input. Asserts a TTL-low pulse for
output.
digio.TRIG_RISINGM or 8
Asserts a TTL-high pulse for output. Input edge detection is not
possible in this mode.
When programmed to any mode except digio.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.
Use of either digio.TRIG_SYNCHRONOUSA or digio.TRIG_SYNCHRONOUSM is preferred over
digio.TRIG_SYNCHRONOUS, as digio.TRIG_SYNCHRONOUS is provided for compatibility with the digital I/O
and TSP-Link triggering on other Keithley Instruments products.
To control the line state, set the mode to digio.TRIG_BYPASS and use the digio.writebit() and
digio.writeport() commands.

Keithley 2651A Specifications

General

Brand	Keithley
Model	2651A
Category	Measuring Instruments
Language	English