Citizen Systems BD2-2220 - Manual (Page 302)

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5.2.2 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.
Aborted
Transfer
Termination from
Other Modes
(except EPP)
Compatibility Mode
Host Xmits
Data
*Forward
Forward Idle
Data
Transfer
End forward
Data Xfer
Termination
Event 1
Failed
Negotiation
Event 6
Negotiation
Event 6
Event 11
Host Busy
Event 11
Reverse
Data
Transfer
Host Busy
Data
Available
Event 7
Event 18
Reverse
Idle
Interrupt
Host
Event 21
Data Not
Available
Event 7