4-5
Initial Setting
4
Let’s take a look at some device states set by the IFC statement.
(1) Talker/listener:
All talkers and listeners are set in the idle state (TIDS, LIDS) within 100 µs.
(2) Controller:
If the controller is not active (SACS: System control Active State), it enters
the idle state “CIDS” (Controller IDle State) within 100 µs.
(3) Return of control right:
If the system controller (the first device on the GPIB which is used as a
controller) has granted the control right to another device when IFC@ is
executed, the control right is returned to the system controller. Generally,
pressing the [RESET] key on the system controller allows an IFC message
to be output from the system controller.
(4) Devices issuing service request:
The state in which an SRQ message is issued by a device (the SRQ line is set
at the low level by the device) is not canceled, but the state in which all
devices on the system bus are placed in the serial poll mode by the controller
is canceled.
(5) Devices in remote state:
For the devices currently in the remote state, the remote state is not canceled
by the IFC message.
4.1 Initialization of Bus by IFC Statement
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