PCI-4302
Interface Corporation
-8-
c. Sending the SDC message
When the SDC message is sent, each device addressed to listen will be initialized. Check the primary
address of the GPIB device is not conflict with the GPIB address of the board.
Specify the GPIB address of the
device to clear in hexadecimal.
Click the
Device Clear
button.
Click the
Clear
button to
send the SDC message.
GPIB address:
The GPIB address is required to control the GPIB device. Specify this address to GPIB device so as not to
conflict with any other devices including the board.
Primary address, Secondary address:
Specify these addresses according to the GPIB devices. The secondary address may be required according to the
device.
•
Primary address range: 00h through 1Eh
•
Secondary address range: 60h through 7Eh
IFC (Interface clear):
The System Controller asserts the IFC line to initialize the bus. The devices on the bus are unaddressed. The
System Controller becomes Controller-in-charge.
Controller-in-charge:
A controller is a GPIB device that can address other devices to talk or to listen. The System Controller can take
control whenever it asserts the IFC line. Only one System Controller can exist in a GPIB system throughout the
operation. The System Controller capability cannot be passed to other devices. Only one active controller
(Controller-in-charge) can exist in a GPIB system at a time.
REN (Remote enable):
The System Controller asserts the IFC line to put the devices into remote programming mode.
SDC (Selected device clear):
This command is used to reset the devices currently addressed as Listener. The devices become device-specific
initial state.
Glossary
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