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FINS Commands with Host Link Protocol Section 3-5
Command transmission to the host computer can commence even when the
port is receiving a command from the host computer (1). The transmission of
a response to the command from the host computer is postponed until the
transmission of the command to the host computer is completed (2).
When a response is not required from the host computer, the Communica-
tions Port Enabled Flag will turn ON when the command to the host computer
has passed from the CPU Unit to the port.
Host Computer Receiving Data
At (1) in the diagram, the response to a command sent from the host com-
puter is being transmitted from the port. In this case, the command transmis-
sion to the host computer is postponed until the response transmission is
completed (2).
When a response is not required from the host computer, the Communica-
tions Port Enabled Flag will turn ON when the command to the host computer
has passed from the CPU Unit to the port.
Response Required
Host computer
Command
Response
Response
Serial Communications Board/Unit
Communications Port Enabled Flag
Command acknowledged
Command completed
No Response Required
Host computer
Serial Communications Board/Unit
Command
Response
Communications Port Enabled Flag
Command acknowledged Command completed
(1)
(2)
(1)
(2)
Command
Command
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