Tektronix 340 manual Parallel port signal descriptions contd

				Technical Notes A
Parallel port signal descriptions (cont'd.)
Pin	Signal mode names:	Return	Signal	Description
	Compatibility/Nibble	pin	source
3	nAck/PtrClk	21	Printer	C mode: Negative true = data
				transfer acknowledge
				N mode: Data qualifier
4	nFault/nDataAvail	22	Printer	C mode: Negative true = printer
				fault exists that prevents
				printing
				N mode: Negative low = data ready,
				then data bits 0 then 4
5	PError/AckDataReq	23	Printer	C mode: Positive true = printer error
				exists, such as media tray
				empty
				N mode: Data bits 2 then 6
6	Data 1	24	Host	C mode: Positive true data input
				N mode: Not used
7	Data 2	25	Host	C mode: Positive true data input
				N mode: Not used
8	Data 3	26	Host	C mode: Positive true data input
				N mode: Not used
9	Data 4	27	Host	C mode: Positive true data input
				N mode: Not used
10	Data 5	28	Host	C mode: Positive true data input
				N mode: Not used
11	Data 6	29	Host	C mode: Positive true data input
				N mode: Not used
12	Data 7	30	Host	C mode: Positive true data input
				N mode: Not used
13	Data 8	31	Host	C mode: Positive true data input
				N mode: Not used

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