SERIAL & PARALLEL DATA CONNECTOR PIN-OUTS

SERIAL & PARALLEL DATA CONNECTOR PIN-OUTS

By: Don McClatchie

          Serial and Parallel data communication has been with us since the dawn of computers and connecting other devices to those computers have always required various types of hardware and wiring. This article gives examples of the most common connection methods old and new, and the wiring scheme for the connection. This list shows the type of connector and the pin wiring for that connector. The IEEE-488 GPIB I/O interface is also listed for those people interested in remote control of instrumentation and testing equipment.

USB UNIVERSAL SERIAL BUSS
Pin #	Signal		Function		Signal
	Description				Direction
					On Device
1	RED WIRE		+ 5 Volt (VSS)		None
2	WHITE		DATA –		In/Out
3	GREEN		DATA +		In/Out
4	BLACK		Ground		None

PS2 Keyboard 5 Pin DIN SERIAL BUSS
Pin #	Signal		Function		Signal
	Description				Direction
					On Device
1	CLOCK		Clock Data In and Out		Output
2	DATA		Data Line		In/Out
3	NONE		Not Connected		None
4	GROUND		Ground for +5, Data & Clock		None
5	+5 VOLTS (vcc)		Power Supply VCC		None

PS2 Keyboard 6 Pin Mini DIN
Pin #	Signal		Function		Signal
	Description				Direction
					On Device
1	DATA		Data Line		In/Out
2	NONE		Not Connected		None
3	GND		Ground for +5, Data & Clock		None
4	+5 VOLTS (vcc)		Power Supply VCC		None
5	CLOCK		CLOCK		Output
6	NONE		Not Connected		None

RS232C Serial Interfaces I/O Standard DB9  Pin Connector (IBM)
Pin #	Signal		Function		Signal
	Description				Direction
					On Device
1	DCD		Data Carrier Detect		Input
2	RD		Receive Data		Input
3	SD		Transmit Data		Output
4	DTR		Data Terminal Ready		Output
5	SG		Signal Ground		None
6	DSR		Data Set Ready		Input
7	RTS		Request to Send		Output
8	CTS		Clear to Send		Input
9	RI		Ring Indicator		Input

RS232C Serial Interfaces I/O Standard DB9  Pin Connector (Macintosh)
Pin #	Signal		Function		Signal
	Description				Direction
					On Device
1	GND		Ground		None
2			No Connection		None
3	SG		Signal Ground		None
4			No Connection		None
5	TD		Transmit Data		Output
6	DTR		Data Terminal Ready		Output
7	DSR		Data Set Ready		Input
8			No Connection		None
9	RD		Receive Data		Input

RS232C Serial Interfaces I/O (Apple IIc)   Round Pin Connector
Pin #	Signal		Function		Signal
	Description				Direction
					On Device
1	DTR		Data Terminal Ready		Output
2	TD		Transmit Data		Output
3	GND		Ground		None
4	RD		Receive Data		Input
5	DSR		Data Set Ready		Input

RS232C Serial Interfaces I/O (Commodore 64)   Round Pin Connector
Pin #	Signal		Function		Signal
	Description				Direction
					On Device
1	SRQIN		Serial SRQIN		Input
2	GND		Signal Ground		None
3	SA		Serial Attn I/O		In/Out
4	SC		Serial Clock I/O		In/Out
5	SD		Serial Data I/O		In/Out
6	RS		Reset		Input

IBM / MSDOS DB25 Parallel Connector Computer Side
Pin #	Signal		Function		Signal
	Description				Direction
					On Device
1	STROBE		Clocks In Data		Output
2	DATA BIT 0		Data Line		Output
3	DATA BIT 1		Data Line		Output
4	DATA BIT 2		Data Line		Output
5	DATA BIT 3		Data Line		Output
6	DATA BIT 4		Data Line		Output
7	DATA BIT 5		Data Line		Output
8	DATA BIT 6		Data Line		Output
9	DATA BIT 7		Data Line		Output
10	ACKNLG		Acknowledge Receipt		Input
11	BUSY		Printer is Busy		Input
12	PAPER EMPTY		Printer Out of Paper		Input
13	SLCT		Online Mode Indicator		Input
14	AUTO FEED XT				Output
15	FAULT ERROR		Indicates Offline Mode		Input
16	INIT		Resets Printer Clears Buffer		Output
17	SLCT IN		TTL High Level		Output
18	GROUND		Ground Return for Pin 1-12		Output
19	GROUND		Ground Return for Pin 1-12		Output
20	GROUND		Ground Return for Pin 1-12		Output
21	GROUND		Ground Return for Pin 1-12		Output
22	GROUND		Ground Return for Pin 1-12		Output
23	GROUND		Ground Return for Pin 1-12		Output
24	GROUND		Ground Return for Pin 1-12		Output
25	GROUND		Ground Return for Pin 1-12		Output

IEEE-488 GPIB I/O Interface 24 Line Parallel Buss Connector
Pin #	Signal		Function		Signal
	Description				Direction
					On Device
1	DATA I/O 1		Data Line I/O Buss		In/Out
2	DATA I/O 2		Data Line I/O Buss		In/Out
3	DATA I/O 3		Data Line I/O Buss		In/Out
4	DATA I/O 4		Data Line I/O Buss		In/Out
5	EIO		End or Identify		In/Out
6	DAV		Data Valid		Output
7	NRFD		Not Ready for Data		Output
8	NDAC		Data Not Accepted		Output
9	SRQ		Service Request		Output
10	IFC		Interface Clear		Output
11	ATN		Attention		Output
12	Shield GND		Wire Ground		None
13	DATA I/O 5		Data Line I/O Buss		In/Out
14	DATA I/O 6		Data Line I/O Buss		In/Out
15	DATA I/O 7		Data Line I/O Buss		In/Out
16	DATA I/O 8		Data Line I/O Buss		In/Out
17	REN		Remote Enable		Output
18	GND		Ground		None
19	GND		Ground		None
20	GND		Ground		None
21	GND		Ground		None
22	GND		Ground		None
23	GND		Ground		None
24	LOGIC GND		Logic Ground		None