Section 3: Functions and features
Series 2600B System SourceMeter® Instrument Reference Manual
3-84
2600BS-901-01 Rev. C / August 2016
Digital I/O configuration
The following figure shows the basic configuration of the digital I/O port. Writing a 1 to a line sets that
line high (~ +5 V). Writing a 0 to a line sets that line low (~0 V). 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 960
µ
A per I/O line.
Figure 86: Digital I/O interface schematic
Controlling digital I/O lines
Although the digital I/O lines are primarily intended for use with a device handler for limit testing, they
can also be used for other purposes such as controlling external logic circuits. You can control lines
either from the front panel or over a remote interface.
To set digital I/O values from the front panel:
1. Press the
MENU
key, select
DIGOUT
, and then press the
ENTER
key or press the navigation
wheel .
2. Select
DIG-IO-OUTPUT
, and then press the
ENTER
key or the navigation wheel .
3. Set the decimal value as required to set digital I/O lines in the range of 0 to 16,383 (see the table
(on page 3-85)), and then press the
ENTER
key or the navigation
wheel .
For example, to set digital I/O lines 3 and 8, set the value to 132.
4. Press the
EXIT (LOCAL)
key as needed to return to the main menu.
