Setting Gpib Addresses; Response To Gpib Meta-Messages (Ieee-488 Universal Commands) - Agilent Technologies 8719ET Programmer's Manual

GPIB Programming
GPIB Operation
The analyzer can also operate in the system-controller mode. This mode is only used when
there is no remote controller on the bus. In this mode, the analyzer takes control of the bus,
and uses it whenever it needs to access a peripheral. While the analyzer is in this mode, no
other devices on the bus can attempt to take control. Specifically, the REN, ATN, and IFC
lines must remain unasserted, and the data lines must be freed by all but the addressed
talker.

Setting GPIB Addresses

In systems interfaced using GPIB, each instrument on the bus is identified by an GPIB
address. This address code must be different for each instrument on the bus. These
addresses are stored in short-term, non-volatile memory and are not affected when you
press or cycle the power. The analyzer occupies two GPIB addresses: the
Preset
instrument itself and the display. The display address is derived from the instrument
address by complementing the instrument's least-significant bit. Hence, if the instrument
is at an even address, the display occupies the next higher address. If the instrument is at
an odd address, the display occupies the next lower address.
The analyzer addresses are set by pressing
system-controller mode, the addresses must be set for the plotter, printer, disk drive, and
power meter.
The default address for the analyzer is device 16, and the display address is device 17.
NOTE There is also an address for the system controller. This address refers to the
controller when the network analyzer is being used in pass-control mode.
This is the address that control is passed back to when the
analyzer-controlled operation is complete.
Response to GPIB Meta-Messages
(IEEE-488 Universal Commands)
Abort
The analyzer responds to the abort message (IFC) by halting all listener, talker, and
controller functions.
Device Clear
The analyzer responds to the device clear commands (DCL, SDC) by clearing the input and
output queues, and clearing any GPIB errors. The status registers and the error queue are
unaffected.
Local
The analyzer will go into local mode if the local command (GTL) is received, the remote
line is unasserted, or the front-panel local key is pressed. Changing the analyzer's GPIB
status from remote to local does not affect any of the front-panel functions or values.
3-14
Local SET ADDRESSES
. In
Chapter 3