Oki 3320, 3321 specifications Figure C-2-3

2.3.2 Mode b

	X-ON, X-OFF
	Received one
	character?
No
		Yes
	Is DSR valid?		Yes
				DSR	High?	No
		No
					Yes
	Buffer overflow?		Yes
		No
	Error?		Parity error
		No error
	Store the received			Store 40 H	in buffer.
	character 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
Has 200 ms		receive time out?
	No
elapsed after sending DC3 is		No
turned on or has 1 second
elapsed?
Yes		No
		Ready to send?
No		Yes
Ready to send?
Yes
Send DC1.		Send DC3.

Yes

Printer busy?

No

Output one character to printer.

Figure C-2-3

C – 6