HP 400 manual Centronics Parallel Interface Pinout Information, Description

Centronics Parallel Pinout Information
																	Data 7
																	Data 6
Acknowledge (ACK)																	Data 5
																	Data 4
Busy																	Data 3
Paper Error (PE)																	Data 2
Ready																	Data 1
Signal Ground																	Data 0
Chassis Ground																	Strobe (STR)
+5V
18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1
36	35	34	33	32	31	30	29	28	27	26	25	24	23	22	21	20	19

Error (ERR)

Reset/Input Clear

Ground

			Figure 2-2. Centronics Parallel Interface Connector
		Table 2-2. Centronics Parallel Interface Pinout Information
Pin
Number	Pin ID		Description
1	Strobe1		A low pulse causes the printer to read one byte of data.
2 - 9	Data 0 - Data 7		These pins are the data lines. Data 0 is the least significant bit (LSB).
10	Acknowledge1		The printer sends a low pulse to indicate that it has accepted a byte of data and is ready
			for more data.
11	Busy		The printer sends a high logic level to indicate to the computer that it cannot receive data
			due to data entry, a full buffer, or error status.
12	Paper Error		The printer sends a high logic level to indicate to the computer that it is out of paper.
13	Ready		The printer sends a high logic level to indicate to the computer that it is in an online
			condition. The printer sends a low logic level to indicate that it is offline or that the input
			buffer is full.
16	Signal Ground		Signal interface ground.
17	Chassis Ground		Chassis ground.
18	+5 V		The printer outputs a +5 volt high logic level through a 2.2K ohm resistor.
19 - 30	Ground		These pins are tied to signal ground.
31	Reset/Input Clear1		A low pulse sent by the computer resets the printer and clears the print buffer. The reset
			occurs on the trailing edge of the pulse.
32	Error1		The printer sends a low logic level to the computer to indicate that it is in an error state.
1.	Active low.

2-4 Installation and Configuration