Specifications

Executing The Programming Model
This section shows the sequence of programming steps that should be used for the
VT1419A. Within each step, most of the available choices are shown using
example command sequences. Further details about various SCPI commands can be
found in the Command Reference Chapter 6. A “command sequence” example can
be found on page 84 of this chapter. Many VEE programming examples can be
found in Chapter 5.
Important It is very important while developing applications that error checking be included at
least at the end of each major programming step by using the SYST:ERR? query
command. Doing so more often may be desirable for complex sequences of
commands in any particular step.
Power-On and *RST
Default Settings
Some of the programming operations that follow may already be set after
Power-ON or after an *RST command. Where these default settings coincide with
the configuration settings required, it is unnecessary to explicitly execute a
command to set them. These are the default settings:
·
No algorithms are defined and therefore no channels will be scanned
· Programmable SCP’s are configured to their Power-ON defaults (see the SCP’s
manual for these defaults)
·
All analog input channels are linked to EU conversion for voltage
·
All non-isolated digital I/O channels are set to input static digital state
·
VT1536A Isolated digital I/O channels are switch configured and wake up as
such
·
Trigger subsystem set to: ARM:SOURCE IMM, TRIG:SOUR TIMER,
TRIG:COUNT INFinite, and TRIG:TIMER 0.010
·
FIFO/CVT data returned in ASCII format
·
FIFO set to BLOCking mode to disallow overwriting of unread data
Figure 3-4 shows a comprehensive, step-by-step programming sequence that may
be required for an application. As stated earlier, many of these steps need only
minimal attention since the most common configurations are defaults at power-ON
or *RST. Figure 3-5 shows a block diagram of the VT1419A with the numbered
programming steps and various SCPI commands associated with those steps.
Keep in mind that the first four SCP positions (0 through 3) can only be configured
with non-programmable SCPs. SCPs with programmable gain/filter, digital
input/output, analog output, strain gage, etc., are NOT supported in these slots.
This restriction encompasses channels 100-131.
Programming the VT1419A Multifunction
Plus
Executing The Programming Model
Chapter 3 53
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