Filter
Top Products
Section
2
GPIB
Interface
2.6
Initializing
the
Device
IEEE488.2
st~pulates three levels of system initialization: initialization of the bus, message and device.
Table
2-6
Types of System lnitialization
Level Type of Initialization
Outline
1
Initialization of the bus Initializes the functions of all the interfaces connected to the bus with the IFC
message from the controller.
2
Initialization of the message Disables the function to report to the controller that the initialization of the
exchange of messages among all the devices on GPIB and relevant operations
are
completed by
DCL,
one
of
the
GPIB
bus commands, and that the initial-
ization of the exchange of messages among specified devices on GPIB and
relevant operations are completed by SCL, also one of the GPIB bus com-
mands.
3
Initialization of the device Returns the device to the original state unique to the device by *RST, regard-
less of the status during past usage.
2.6.1 lnitializing the Bus
IFC:
Initialization of the bus by the IFC statement
Function:
Switches the IFC line into an active state for about
100
ps and initializes the interface function of all the
devices connected to the GPIB bus line. IFC can be transmitted only by the system controller.
2.6.2 lnitializing the Message
DC'L and
SDC:
Initialization of the exchange of messages by the DCL and SDC bus commands
Initializes the exchange of messages for all the devices on GPIB or specified devices on GPIR.
Functions:
Initialization of the message exchange is aimed at setting preparations to enable the controller to send
new instructions in the event that sections related to the message exchange in devices are set in a state
inappropriate for the control to be executed from the controller because, for example, other programs
were executed earlier, although changing the panel setting is not required.
DCL:
Initializes the message exchange among all the devices on GPIB
SDC:
Initializes the message exchange among specified devices.