Anritsu MT8801C - General Description

Section 6 Initial Settings
6-2
6.1 General Description
There are three levels of initialization for the GPIB system.
The first level is bus initialization using the IFC statement with the system bus in the
idle state.
The second level is initialization for message exchange using the DCL command to
enable devices to receive program messages.
The third level is device initialization using the PRE or *RST command to initialize
device functions. These levels of initialization prepare a device for operation.
A device must be set to a known state when the power is switched on.
The IFC message from the controller initializes all
interface functions connected to the bus.
The message exchanges of all devices and
specified devices on the GPIB are initialized
respectively by the DCL (Device Clear) and
SDC (Select Device Clear) GPIB bus
commands, which also nullify the function that
reports to the controller that operation has
completed.
The ∗RST or PRE/INI/IP command returns
the specified device to the device-dependent
known state, regardless of the conditions of
previous device use.
Can be combined with other
levels, level 1 must be executed
before level 2.
Can be combined with other
levels, level 2 must be executed
before level 3.
Can be combined with other
levels; level 3 must be executed
after levels 1 and 2.
Level
1
2
3
Initialization type
Bus initialization
Initialization
for message
exchange
Device
initialization
Description
Level combination and sequence
The following paragraph describes the commands for executing levels 1, 2, and 3, and
the items initialized by execution. It also describes the known state which is set when
the power is switched on.
When controlling with an external controller through the GPIB interface bus, all the
initialization functions of the first/second/third levels can be used.
When controlling with an external controller through the RS-232C interface port, the
initialization function of the third level (device initialization) can be used. The initial-
ization functions of the first/second levels cannot be used.