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Automating Measurements
Operator Interaction
The USER TTL port can be used as a general-purpose input or output. Like
the LIMIT TEST IN/OUT line, the USER TTL IN/OUT line is au open collector
drive. When used as an input, the state of the USER TTL IN/OUT line can be
read with either the SCPI command
or with the IBASIC command
I = READIO(lS,l>
When used as an output, the state of the USER TTL IN/OUT line can be set
with either the SCPI command
or with the IBASIC command
The USER TTL IN/OUT port can also be used in conjunction with an external
switch for softkey auto-stepping, or as a "sweep out" port. Be sure that USER
TTL IN/OUT port is coniigured properly for general-purpose I/O by pressing
[
) &w%rxa
SYSTEM OPTIONS
the following SCPI command:
Be sure to observe static precautions when using this port.
C A U T I O N
7-34
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