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CHAPTER 4: Operation
19
Data Flow — A/S-2G to Synchronous Device
Bisynchronous Device A/S-2G Converter Asynchronous Device
ACK 1
NAK
Negative Acknowledgment
AA AA 32 32 32 32 3D FF FF
ACK 0
WAK
AA AA 32 32 32 32 6B FF FF
Holds up transmission while
buffer clears DC3 (ASCII 13
Hex) or drop DTR CTS or
user-specified lead
Frees up buffer space.
(Echo CR LF)
Allow resumption of
transmission DC1 (ASCII 11
Hex) or raise DTR
Complete block D
Send block E
(Echo all but CR LF)
X-OFF
Send block C
X-ON
Send block D
Resend block D
Send block E
If A/S-2G buffer is nearly full when asynchronous device is transmitting:
If synchronous device has WAK capability and buffer is full:
2-second interval
If data not properly received by synchronous device or
synchronous device has no WAK capability and buffer is full: