Oki 3391 Printer User Manual


 
C – 6
Figure C-2-3
X-ON, X-OFF
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
Printer busy?
No
Output one character to printer.
No
Yes
No
Has 200 ms
elapsed after sending DC3 is
turned on or has 1 second
elapsed?
Is remaining
buffer space > 256 during
receive time out?
Ready to send?
Ready to send?
Yes
Send DC1. Send DC3.
No
Yes
No
2.3.2 Mode b