Black Box PCW22A-R3 Manual de usuario Pagina 25

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PROTOCOL CONVERTER A/S-2G
24
Data Flow — A/S-2G to Asynchronous Device
Bisynchronous Device A/S-2G Converter Asynchronous Device
ENQ
Send data block A
Send data block B
ENQ
ENQ
Send data block C
Unformatted mode—
successive characters
(including spaces) appear
one after another as sent
ACK 0
ACK 1
Send block A
WAK
WAK
Send block B
ACK 0 (when
buffer
available)
ACK 1
Send block C
If A/S-2G buffer is nearly full when synchronous device is transmitting:
2-second interval
2-second interval
WAK resets ENQ counter with
respect to ENQ time out
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