Keithley SourceMeter 2600 Series Reference Manual page 252

10-4 Digital I/O Port
WARNING
Digital I/O configuration
Figure 10-2
line sets that line high (~ +5V). Writing a 0 to a line sets that line low (~0V). Note
that an external device pulls an I/O line low by shorting it to ground, so that a
device must be able to sink at least 480μA per I/O line.
2600S-901-01 Rev. A / May 2006
Series 2600 System SourceMeters Reference Manual
The Digital I/O port of the Model 2601/2602 SourceMeter is not
suitable for control of safety circuits and should not be used to
control a safety interlock. The Model 2611/2612 SourceMeter
Digital I/O port includes an Interlock line to be used as safety
interlock. When an interlock is required for safety, a separate
circuit should be provided that meets the requirements of the
application to reliably protect the operator from exposed
voltages.
shows the basic configuration of the Digital I/O port. Writing a 1 to a
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