3-1
3
3
Programming Instructions
3.1
INTRODUCTION
This section describes the operation of the 4807/2307/4867/2367, their
IEEE 488.2 Status Structure, 488.2 Commands, SCPI commands,
Programming Guidelines and Interfaces. The functional descriptions apply
to all units unless otherwise stated.
3.2
GENERAL OPERATION
3.2.1
All Units
The Digital Interface is user configurable as inputs or outputs in eight bit
bytes. Interface configuration and data transfer is done by commands
received from the GPIB bus or Serial interface. The 4807/2307/4867/2367
are no data handshake or strobe lines. The commands transfer data by direct
byte (port) access or as strings of data characters. The digital interface
configuration, data formats and transfer protocol can be saved in Flash
memory and are automatically recalled at power turn-on or when the unit
is reset.
The 4807/2307/4867/2367 is an IEEE-488.2 compliant device and has an
extensive Status Reporting Structure. Command errors and over-limit
voltage commands set bits in the Event Status (ESR) Register. The
Questionable Register may be used to monitor changes in up to fifteen of
the Digital Input lines. The Transition Register may be set so positive and/
or negative input signal changes set bits in the Questionable Event register.
When the corresponding Questionable Enable or ESR Enable Register bits
are set, the set event bits will propagate onto the register summary outputs
