66
computer is required, the execution possible flag will turn ON when the com-
mand to the host computer is delivered from the PC to the Host Link Unit.
The following timing charts show the transmission timing in full-duplex commu-
nications in which the host computer is waiting to send a response after the host
computer transmitted data.
(2)
Command
Command
1
0
Command
Command
Response required
Host computer
Host Link Unit
Response
Response
Execution possible flag
Response not required
Host Link Unit
Execution possible flag
Reception of command
End of reception
Response
Host computer
(2)
(1)
(1)
Reception of command End of reception
1
0
Response delay
Response delay
If the command format sent from the host computer includes a response delay
setting, the Host Link Unit will not send a command to the host computer until the
response delay time passes (refer to (1) of the above). A response for a com-
mand from the host computer will be transmitted only after the Host Link Unit
completes transmitting the command to the host computer (refer to (2) of the
above). If no response from the host computer is required, the execution pos-
sible flag will turn ON when the command to the host computer is delivered from
the PC to the Host Link Unit.
Communications Timing Section 4-5
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