Agilent Technologies 8719ES User Manual page 122

Making Measurements
Using Test Sequencing
The TESTSET I/O bits are set using the
under the
TTL I/O
Seq
are described in Table
is required for both test port directions, the settings must be made under both
TESTSET I/O FWD
external conditions in a test requiring changes between the forward and reverse
measurements, as might be needed in a high power test, for example.
TTL I/O Menu
This menu can be accessed by pressing
TTL Output for Controlling Peripherals Eight TTL compatible output lines can be
used for controlling equipment connected to the parallel port. By pressing
you will access the following softkeys that control the individual output bits. Refer to
Figure 1-78 for output bus pin locations.
PARALLEL OUT ALL
the bus as binary.
lets you set a single bit (0 − 7) to high on the output bus.
SET BIT
lets you set a single bit (0 − 7) to low on the output bus.
CLEAR BIT
TTL Input Decision Making Five TTL compatible input lines can be used for decision
making in test sequencing. For example, if a test fixture is connected to the parallel port
and has a micro switch that needs to be activated in order to proceed with a measurement,
you can construct your test sequence so that it checks the TTL state of the input line
corresponding to the switch. Depending on whether the line is high or low, you can jump to
another sequence. To access these decision making functions, press
to Figure 1-78 for input bus pin locations.
PARALL IN BIT NUMBER
be looking for.
PARALL IN IF BIT H
selected is in a high state.
PARALL IN IF BIT L
selected is in a low state.
Pin assignments:
• pin 1 is the data strobe
• pin 16 selects the printer
• pin 17 resets the printer
• pins 18-25 are ground
1-108
TESTSET I/O FWD
keys. The values of the outputs (pins 11, 22, and 23)
TTL OUT
1-5. The value changes with the test port, so if the external control
and TESTSET I/O REV
TTL I/O
lets you input a number (0 to 255) in base 10 and outputs it to
lets you select the single bit (0 − 4) that the sequence will
lets you jump to another sequence if the single input bit you
lets you jump to another sequence if the single input bit you
and TESTSET I/O REV
. This capability can be used to set different
in the Sequencing menu.
keys
Seq TTL I/O
. Refer
Seq TTL I/O
,