PCI-4302
Interface Corporation
-12-
1. Service Request (SRQ)
2. Receiving STB
Controller
Did you request a service?
Yes, I did.
I will send my status byte.
Controller
Did you request a service?
No
Device 1, 2: Talker or Listener
Flowchart of Serial Polling
Controller
Device 1
Request service
STB
STB
Device 1
Device 2
Device 2
Device 2
Device 1
Figure 2.2 Serial polling
2.5 Closing the GPIB Interface Board
To exit the GPIB utility program and close the board, click
Close the Device
on the
File
menu. After closing
the board, click
Exit
on the
File
menu.
Glossary
SRQ (Service request):
A device asserts the SRQ line to request services from the
Controller.
STB (Status byte):
Status byte is a data byte sent by a device when it is serial polled.
Serial Poll:
Serial poll is a process in which the Controller-in-charge
determines which device requests service and reads the status byte
from the requesting device. The Controller-in-charge performs a
serial poll for one device at a time.
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