8-4 Return to Section Topics 2600AS-901-01 Rev. B / September 2008
Section 8: Digital I/O Series 2600A System SourceMeter® Instruments Reference Manual
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 via remote interface.
NOTE The trigger mode for the line must be set to digio.TRIG_BYPASS in
order to use the line for digital I/O. See
Section 10 for more
information.
Digital I/O bit weighting
Bit weighting for the digital I/O lines is shown in Table 8-1.
Table 8-1
Digital bit weight
Setting digital I/O values
To set digital I/O values:
1. Press the MENU key, select DIGOUT, and then press the ENTER key or push 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 line(s) within the range of 0 to 16,383
(see
Table 8-1), then press the ENTER key or the navigation wheel.
4. Press EXIT as needed to return to the normal.
Write protecting digital I/O lines
You can also write protect specific digital I/O lines to prevent their values from being changed:
1. Press MENU > DIGOUT and then press the ENTER key or the navigation wheel.
2. Select WRITE-PROTECT, then press the ENTER key or the navigation wheel.
3. Set the decimal value as required to write protect digital I/O line(s) within the range of 0 to
16,383 (see
Table 8-1), then press the ENTER key or the navigation wheel.
4. Press EXIT as needed to return to the normal display.
Line # Bit
Decimal
weighting
Hexadecimal
weighting
1
2
3
4
5
6
7
8
9
10
11
12
13
14
B1
B2
B3
B4
B5
B6
B7
B8
B9
B10
B11
B12
B13
B14
1
2
4
8
16
32
64
128
256
512
1024
2048
4096
8192
0x0001
0x0002
0x0004
0x0008
0x0010
0x0020
0x0040
0x0080
0x0100
0x0200
0x0400
0x0800
0x1000
0x2000
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