Mode B - Oki ML420 Maintenance Manual

2.3.2 Mode b

42113901TH01 Rev.3
X-ON, X-OFF
Received one
character?
No
Yes
Is DSR valid?
No
Buffer overflow?
No
Error?
Store the received
character in buffer.
Is the
printer in DESELECT
state or is the paper
low?
No
Is remaining
buffer space < 256?
No
Has 200 ms
elapsed after sending DC3 is
turned on or has 1 second
elapsed?
Yes
No
Ready to send?
Yes
Send DC1.
Yes
Printer busy?
No
Output one character to printer.
Figure C-3
Yes
Yes
Parity error
No error
Store 40 H in buffer.
Yes
Yes
Yes
buffer space > 256 during
No
Oki Data CONFIDENTIAL
No
DSR High?
Yes
Is remaining
receive time out?
No
No
Ready to send?
Yes
Send DC3.
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