Oki ML421 Maintenance Manual - Page 128

Communication Procedure Flowchart

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Oki Data CONFIDENTIAL 2.3 Communication Procedure Flowchart 2.3.1 Mode a Ready/Busy Received one character? No Yes Is DSR valid? No Yes DSR High? No Yes Buffer overflow? Yes No Error? No error Store the received character in buffer. Parity error Store 40 H in buffer. Is the printer in DESELECT Yes state or is the paper low? No Is remaining Yes buffer space ≤ 256? No Yes Is remaining buffer space > 256 during No Has 200 ms or 1s elapsed after SSD was turned on? receive time out? No Yes Turn off the SSD signal. Turn on the SSD signal. 42113901 Rev.2 Yes Printer busy? No Output one character from the buffer to printer. Figure C-2 128 /

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42113901
Rev.2
128 /
Oki
Data
CONFIDENTIAL
2.3
Communication Procedure Flowchart
2.3.1
Mode
a
Ready/Busy
Received one
character?
Yes
Is DSR valid?
No
Buffer overflow?
Error?
Parity error
No error
Store the received
character in buffer.
Is the
printer in DESELECT
state or is the paper
low?
No
No
Yes
Yes
No
DSR High?
Yes
Store 40 H in buffer.
Yes
Yes
No
Yes
Is remaining
buffer space
≤
256?
Yes
No
Turn on the SSD signal.
Turn off the SSD signal.
Printer busy?
No
Output one character from the
buffer to printer.
No
Yes
No
Has 200 ms or
1s elapsed after SSD was
turned on?
Is remaining
buffer space > 256 during
receive time out?
Figure C-2