Section 3: Functions and features Model 2657A High Power System SourceMeter® Instrument Reference Manual
3-82 2657A-901-01 Rev. B/December 2012
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.
The trigger mode for the line must be set to digio.TRIG_BYPASS in order to use the line for digital
I/O. See Triggering (on page 3-31) for more information.
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
in Digital I/O bit weighting
(on page 3-83)), 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.
To write-protect specific digital I/O lines to prevent their values from being changed:
1. Press the MENU key, then select DIGOUT, and then press the ENTER key or the navigation
wheel .
2. Select WRITE-PROTECT, and then press the ENTER key or the navigation wheel .
3. Set the decimal value as required to write-protect digital I/O lines within the range of 0 to 16,383
(see Digital I/O bit weighting
(on page 3-83)), and then press the ENTER key or the navigation
wheel .
For example, to write-protect digital I/O lines 4 and 10, set the value to 520.
4. Press the EXIT (LOCAL) key as needed to return to the main menu.
To remove write protection, reset the decimal value to include only the lines that you want to write
protect. To remove write protection from all lines, set the value to 0.
NOTE
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