8-6 HP IBASIC Supplement
Interfacing with External Devices
Communication with Devices
Using the Serial and Parallel Ports
The analyzer has a parallel port and a serial port for use with
peripherals (like printers and plotters), material handlers and other
devices. Active control of the GPIB interface is not needed when these
ports are being used.
In addition to the serial and parallel ports, there are also two BNC
connectors on the rear panel of the analyzer. These connectors provide
access (using TTL signal levels) to two programmable bits:
Limit Test TTL bit — indicates the results of a pass/fail limit test
User TTL bit — to be used as needed (for example to be used with a
foot pedal)
Using the Analyzer Ports in IBASIC Programs
IBASIC can directly control the serial port, the parallel port, the
Pass/Fail TTL bit, and the User bit without using the GPIB commands
along with READIO and WRITEIO commands. However, READIO and
WRITEIO are faster than GPIB commands.
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