Keithley 708B Reference Manual page 312

Models 707B and 708B Switching Matrix Reference Manual
Usage
triggerMode = digio.trigger[N].mode
digio.trigger[N].mode = triggerMode
triggerMode
N
Details
Set tmode to one of the following values:
Trigger mode values
triggerMode
digio.TRIG_BYPASS or 0
digio.TRIG_FALLING or 1
digio.TRIG_RISING or 2
digio.TRIG_EITHER or 3
digio.TRIG_SYNCHRONOUSA or 4
digio.TRIG_SYNCHRONOUS or 5
digio.TRIG_SYNCHRONOUSM or 6
digio.TRIG_RISINGA or 7
digio.TRIG_RISINGM or 8
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.
digio.TRIG_SYNCHRONOUS is provided for compatibility with older firmware. Either
digio.TRIG_SYNCHRONOUSA or digio.TRIG_SYNCHRONOUSM should be used instead.
When reading the trigger mode, tmode is returned as a number.
To control the line state, use digio.TRIG_BYPASS with the digio.writebit() and the
digio.writeport() commands.
Example
digio.trigger[4].mode = 2
707B-901-01 Rev. A / August 2010
The trigger mode; see Details for values.
Digital I/O trigger line (1 to 14).
Description
Allows direct control of the line.
Detects falling-edge triggers as input; asserts a TTL-low
pulse for output.
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.
Detects rising- or falling-edge triggers as input. Asserts a
TTL-low pulse for output.
Detects the falling-edge input triggers and automatically
latches and drives the trigger line low. Asserting the output
trigger releases the latched line.
Detects the falling-edge input triggers and automatically
latches and drives the trigger line low. Asserts a TTL-low
pulse as an output trigger.
Detects rising-edge triggers as input. Asserts a TTL-low
pulse for output.
Detects rising-edge triggers as input. Asserts a TTL-low
pulse for output.
Asserts a TTL-high pulse for output. Input edge detection is
not possible in this mode.
Sets the trigger mode for I/O Line 4 to
digio.TRIG_RISING.
Section 7: Command reference
7-59