2600AS-901-01 Rev. B / September 2008 Return to Section Topics 8-5
Series 2600A System SourceMeter® Instruments Reference Manual Section 8: Digital I/O
5. To remove write protection, repeat Step 1 thorough Step 4 and then enter the original value.
Remote digital I/O commands
Commands that control and access the digital I/O port are summarized in Table 8-2. See
Section 19 for complete details on these commands. See Table 8-1 for decimal and hexadecimal
values used to control and access the digital I/O port and individual lines. Use these commands to
trigger the Series 2600A using external trigger pulses applied to the digital I/O port, or to provide
trigger pulses to external devices.
Use these commands to perform basic steady-state digital I/O operations such as reading and
writing to individual I/O lines or reading and writing to the entire port.
NOTE The digital I/O lines can be used for both input and output. You must
write a 1 to all digital I/O lines that are to be used as inputs.
Table 8-2
Remote digital I/O commands
Digital I/O programming example
The commands below set bit 1 of the digital I/O port high, and then read the entire port value.
digio.trigger[1].mode = digio.TRIG_BYPASS
-- Set bit 1 high.
digio.writebit(1,1)
-- Read digital I/O port.
data = digio.readport()
Output enable (Models 2601A/2602A)
Overview
The Model 2601A/2602A digital I/O port provides an output enable line for use with a test fixture
switch. When properly used, the output of the SourceMeter instrument will turn OFF when the lid
of the test fixture is opened. See
Section 2 for important safety information when using a test
fixture.
Command Description
digio.readbit(bit)
digio.readport()
digio.writebit(bit, data)
digio.writeport(data)
digio.writeprotect = mask
Read one digital I/O input line
Read digital I/O port
Write data to one digital I/O output line
Write data to digital I/O port
Write protect mask to digital I/O port
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