Keithley 2657A User Manual

Section 7: TSP command reference Model 2657A High Power System SourceMeter® Instrument Reference Manual
7-50 2657A-901-01 Rev. B/December 2012
digio.readport()
This function reads the digital I/O port.
Type TSP-Link accessible
Affected by Where saved Default value
Function Yes
Usage
data = digio.readport()
data
The present value of the input lines on the digital I/O port
Details
The binary equivalent of the returned value indicates the value of the input lines on the I/O port. The least
significant bit (bit B1) of the binary number corresponds to line 1; bit B14 corresponds to line 14.
For example, a returned value of 170 has a binary equivalent of 000000010101010, which indicates that lines 2,
4, 6, and 8 are high (1), and the other 10 lines are low (0).
Example
data = digio.readport()
print(data)
Assume lines 2, 4, 6, and 8 are set high when
the I/O port is read.
Output:
1.70000e+02
This is binary 10101010
Also see
digio.readbit() (on page 7-49)
digio.writebit()
(on page 7-58)
digio.writeport()
(on page 7-58)
Digital I/O port
(on page 3-80)
digio.trigger[N].assert()
This function asserts a trigger on one of the digital I/O lines.
Type TSP-Link accessible
Affected by Where saved Default value
Function Yes
Usage
digio.trigger[N].assert()
N
Digital I/O trigger line (1 to 14)
Details
The set pulsewidth determines how long the trigger is asserted.
Example
digio.trigger[2].assert()
Asserts a trigger on digital I/O line 2.

Keithley 2657A Specifications

General

Brand	Keithley
Model	2657A
Category	Measuring Instruments
Language	English