Fujitsu C145-C037-01EN manual Prm, Dstb

Table 5.2 Parallel interface signals (continued)

Connector	Return				Signal
pin	line pin	Compati mode					Direction		Description
number	number					Nibble mode
4	22						Output	This signal goes low under the following printer
			Fault
								conditions:
								(1)	Offline
								(2)	Paper out
								(3) Cover open
								(4)	Other printer error
				Data Available				Reverse data transfer phase:
								This signal is set low when the printer is ready to
								send data to the host. During the data transfer, it is
								used as data bit 0 (LSB), then data bit 4.
								Reverse idle phase:
								This signal is used to indicate that data is available.
5	23	Paper Empty (PE)					Output	This signal goes high if paper runs out.
					Ack Data Req			Reverse data transfer phase:
								Data bit 2, then data bit 6
								Reverse idle phase:
								This signal is set high until the host requests data
								and, after that, follows the Data Available signal.
6	24	Data 1					Input	• Data 1 to Data 8 signals correspond to parallel
7	25	Data 2					Input	data bits 1 to 8.
8	26	Data 3					Input	• Data 8 is the most significant bit.
9	27	Data 4					Input	• All signals must go high at least 0.5 μs before
10	28	Data 5					Input	the falling edge of the Data Strobe signal, and
11	29	Data 6					Input
								must stay high for at least 0.5 μs after the rising
12	30	Data 7					Input	edge.
13	31	Data 8					Input
14	32	Input Prime					Input	Reserved (*1)
		(IN PRM)
15	33	Data Strobe					Input	• Strobe pulse for reading data (Data 1 to Data 8).
								The printer reads data when this signal is low.
		(DSTB)
								• The pulse width must be 0.5 μs or more at the
								printer’s receiving terminal.
						Host Clock		This signal is set high when the host requests the
								reverse data transfer phase (nibble mode).
16	34	(Select In)					Input	Reserved (*1)
						1284 Active		This signal goes high to cause the printer to enter the
								reverse data transfer phase (nibble mode).

5-9