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Printer pacing and Flow Control
The example below shows how Pacing and Flow Control work on a printer.
(Host)
Mini-
Computer
Channel
MUX
Link
MUX
Channel
(Remote)
Printer
1
1
A.
B.
C.
D.
E.
F.
G.
H.
Printer Prints
Data
Print Buffer
Full
Print Data
Pace
off
Flow Control
off
Flow Control
off
Flow Control
on
Flow Control
on
Printer Prints
Data
Print Data
Printer
Ready
Pace
on
A. Print data volume from the mini is appropriate for the printer to process and print it.
B. The printer cannot handle any more data due to its buffers being full and it issues a Pace OFF signal to
the mux.
C. The remote mux sends a Flow Control OFF signal to the other mux and uses its buffer to store any
pending print data.
D. The host mux sends a Flow Control OFF signal to the mini and uses its buffer to store any pending print
data.
E,F,G. The printer buffer empties and is ready for more print data, so it issues a Pace ON signal which, in
turn, causes a Flow Control ON signal through to the mini.
H. Print data from the mini resumes.