Keithley 2635 Reference Manual

12-20 Return to Section Topics 2600S-901-01 Rev. C / January 2008
Section 12: Instrument Control Library Series 2600 System SourceMeter® Instruments Reference Manual
digio.trigger[N].mode
Replace N with the number of the digital I/O trigger line: 1 to
14.
Attribute The trigger operation and detection mode.
Usage trig_mode = digio.trigger[N].mode
digio.trigger [N].mode = mode
N The trigger line number.
trig_mode The active trigger mode.
mode Selects the current trigger mode.
Choose one the following values for mode:
0 or digio.TRIG_BYPASS Allows direct control of the line.
1 or digio.TRIG_FALLING Detects falling edge input triggers.
Asserts TTL-low pulse as an output trigger.
2 or digio.TRIG_RISING 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.
3 or digio.TRIG_EITHER Detects rising or falling edge triggers.
Asserts a TTL-low trigger pulse.
4 or digio.TRIG_SYNCHRONOUSADetects the falling edge input triggers and
automatically latches and drives the trigger
line low.
Asserting the output trigger releases the latched
line.
5 or digio.TRIG_SYNCHRONOUS Detects the falling edge input triggers and
automatically latches and drive the trigger
line low.
Asserts a TTL-low pulse as an output trigger.
6 or digio.TRIG_SYNCHRONOUSMDetects rising edge triggers as an input.
Asserts a low TTL-low pulse for output.
7 or digio.TRIG_RISINGA Detects Rising Edge triggers as an input.
Asserts a low TTL-low pulse as an output.
8 or digio.TRIG_RISINGM Edge detection as an input is not available.
Generates a TTL-high pulse as an output trigger.
Remarks • You can express the mode as a number (0 through 8) or you can use one of the
pre-defined constants (see "Usage").
• The custom variable mode stores the trigger mode as a numeric value when the attribute
is read.
• The default trigger mode for a line is digio.TRIG_BYPASS.
• To control the line state, use the digio.TRIG_BYPASS mode with the
digio.writebit and the digio.writeport commands.
• (Firmware version prior to 1.4.0 only) Use the digio.TRIG_SYNCHRONOUS mode for
backward firmware compatibility.
• (Firmware version 1.4.0 and higher) Use digio.TRIG_SYNCHRONOUSA or
digio.TRIG_SYNCHRONOUSM modes.
• (Firmware version prior to 1.4.0 only) Use the digio.TRIG_RISING mode for
backward compatibility.
• (Firmware version 1.4.0 and higher) Use digio.TRIG_RISINGA or
digio.TRIG_RISINGM modes.
Details See “Controlling digital I/O lines” in Section 10, digio.writebit, and digio.writeport.
Example -- Sets the trigger mode for the I/O line 7 to digio.TRIG_RISINGM.
digio.trigger [7] = 8

Keithley 2635 Specifications

General

Brand	Keithley
Model	2635
Category	Measuring Instruments
Language	English