Citizen CBM-1000 - Interfacing Phases

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13.1.2 Interfacing Phases
Interfacing in each communication mode is divided into several phases. In
addition, there is a phase for mode initialization, as well as a phase for mode
switching. Interface signals may differ in name and function for different modes
and different phases.
*Forward
Data
Transfer
Forward
idle
Reverse
Data
Transfer
Host Busy
Data Not
Available
Host Busy
Data
Available
Interrupt
Host
Reverse
idle
Termination
Compatibility Mode
Negotiation
Failed
Negotiation
Event 1
Event 6 Event 6
Event 11
Event 7
Event 7 Event 21
Event 18
Event 11
Host Xmits
Data
Aborted
Transfer
Termination from
Other Modes
(Except EPP)
End forward
Data Xfer