Oki 3321, 3320 specifications Communication Procedure Flowchart, Mode a

2.3Communication Procedure Flowchart

2.3.1 Mode a

		Ready/Busy
		Received	one
No		character?
				Yes
		Is DSR valid?			Yes
				No		DSR	High?	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?
					Yes	Is remaining
				No		buffer space > 256 during
		Has 200 ms or				receive time out?
No
		1s elapsed after SSD was					No
		turned on?				Turn on the SSD signal.
				Yes
		Turn off the SSD signal.
Yes		Printer busy?
				No
	Output one character from the
		buffer to printer.

Figure C-2-2

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