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Section 4: Interface Control Operations
47
In both Auto and Manual modes, the interface control functions are performed in the same way. Single-
device operations are carried out by the primary device—except for the
LISTEN
function, which requires
an address. Loop-control operations affect all devices, regardless of the interface mode.
The following table illustrates how Auto and Manual modes affect the operation of the interface loop:
Operation
Auto Mode
Manual Mode
Printer Operations Performed by first printer-type
device in loop starting with primary
device.
Performed by primary device, if
possible.
Mass Storage
Operations
Performed bv combination of all
mass storage devices in loop
starling with primary device.
Performed by primary device, if
possible.
Interface Control
Operations
Single-device operations
performed by primary device, if
possible.
Single-device operations
performed by primary device, if
possible.
As an example, device #2 is selected as the primary device in the interface loop shown below. The loop
operates this way:
Auto Mode with Primary Device #2