Keithley 2657A User Manual

Model 2657A High Power System SourceMeter® Instrument Reference Manual Section 7: TSP command reference
2657A-901-01 Rev. B/December 2012 7-59
Details
The binary representation of data indicates the output pattern to be written to the I/O port. For example, a data
value of 170 has a binary equivalent of 00000010101010. Lines 2, 4, 6, and 8 are set high (1), and the other 10
lines are set low (0).
Write-protected lines are not changed.
The reset() function does not affect the present states of the digital I/O lines.
Use the digio.writebit() and digio.writeport() commands to control the output state of the
synchronization line when trigger operation is set to digio.TRIG_BYPASS.
Example
digio.writeport(255)
Sets digital I/O Lines 1 through 8 high (binary
00000011111111).
Also see
digio.readbit() (on page 7-49)
digio.readport()
(on page 7-50)
digio.writebit()
(on page 7-58)
digio.writeprotect
(on page 7-59)
digio.writeprotect
This attribute contains the write-protect mask that protects bits from changes from the digio.writebit() and
digio.writeport() functions.
Type TSP-Link accessible Affected by Where saved Default value
Attribute (RW) Yes Instrument reset
Recall setup
Saved setup 0
Usage
mask = digio.writeprotect
digio.writeprotect = mask
mask
Sets the value that specifies the bit pattern for write-protect
Details
Bits that are set to one cause the corresponding line to be write-protected.
The binary equivalent of mask indicates the mask to be set for the I/O port. For example, a mask value of 7 has a
binary equivalent of 00000000000111. This mask write-protects lines 1, 2, and 3.
Example
digio.writeprotect = 15
Write-protects lines 1, 2, 3, and 4.
Also see
digio.writebit() (on page 7-58)
digio.writeport()
(on page 7-58)

Keithley 2657A Specifications

General

Brand	Keithley
Model	2657A
Category	Measuring Instruments
Language	English