6 initializing the device, 1 initializing the bus, 2 initializing the message – Anritsu MP1777A User Manual
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2.6
initializing the Device
IEEE488.2 stipulates three levels of system initialization: initialization of the bus, message and device.
Table 2-6 Types of System Initialization
Section 2 GPIB Interface
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 Initializing the Bus
IFC:
Initialization of the bus by the IFC statement
Function:
Switches the IFC line into an active state for about 100 |is 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 Initializing the Message
DCL 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 GPIB.
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.
2-8
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