Bus Messages
ICE REQUEST, ABORT interface activity, or PASS CONTROL). Bus commands are issued
through one of the bus management lines or through the eight bit data bus. Figure 2-5
lists the commands used in the command mode.
In the data mode, data or instructions are transferred between instruments on the
HP-IB. Instructions transferred to the instrument are called device dependent com-
mands. All the commands specifically for the HP 3326A fall into this category. The
HP 3326A device dependent commands configure the HP 3326A, initiate measurements,
initiate data transfers, or define error reporting conditions. These device dependent
commands are meaningless for other instruments. The HP 3326A device dependent
commands are listed in Chapter Ill.