Data Communications - Data Interface PinOuts

 

RS-232 Pinout ( 25 Way D Type ) Asynchronous
Pin	Description	Connector Type	DTE	DCE	Notes
2	Tx Data	25 Way D-Type	Out	In
3	Rx Data		In	Out
4	RTS		Out	In	RTS/CTS
5	CTS		In	Out	RTS/CTS
6	DSR		In	Out	DSR/DTR
7	Signal ground
8	DCD		In	Out
20	DTR		Out	In	DSR/DTR
22	RI		In	Out

  

EIA-232 / RS-232 Pinout ( Mainly 25 Way D Type ) Synchronous
Pin	Description	Connector Type	DTE	DCE	Notes
2	Tx Data	25 Way D-Type	Data Out	Data In
3	Rx Data		Data In	Data Out
7	Signal ground
15	Tx Clock		Clock Out	Clock In
17	Rx Clock		Clock Out	Clock In
24	Tx Clock		Clock In	Clock Out
EIA-232 / RS-232 Pinout ( PC Comm Port - 9 Way D Type ) Asynchronous
Pin	Description	Connector Type	DTE(PC)	DCE	Notes
1	DCD Data Carrier Detect	9 Way D-Type Male	Data In	Data Out
2	Rx Data		Data In	Data Out
3	Tx Data		Data Out	Data In
4	DTR Data Terminal Ready		Data Out	Data In
5	Signal Ground
6	DSR Data Set Ready		Data In	Data Out
7	RTS Request to Send		Data Out	Data In
8	CTS Clear to Send		Data In	Data Out
9	RI Ring Indicator		Data In	Data Out
EIA-449 / V.35 Pinout ( Mainly 37 Way D Type or Cannon ) Synchronous
Pin	Description	Designation / Label	DCE	DTE	Notes
1	Shield
2	Signal Rate Indicator	S	In	Out
3	N/C
4	Send Data (A)	SD-	Data In	Data Out
5	Send Timing (A)	ST-	Clock Out	Clock In
6	Receive Data (A)	RD-	Data Out	Data In
7	Request To Send (A)	RS-	In	Out
8	Receive Timing (A)	RT-	Clock Out	Clock In
9	Clear To Send (A)	CS-	Out	In
10	Local Loopback	LL	In	Out
11	Data Mode (A)	DM-	Out	In
12	Terminal Ready (A)	TR-	In	Out
13	Receiver Ready (A)	RR-	Out	In
14	Remote Loopback	RL	In	Out
15	Incoming Call	IC	Out	In
16	Signal Freq./Sig. Rate Select.	SF/SR+	Out/In	In/Out
17	Terminal Timing (A)	TT-	Clock In	Clock Out
18	Test Mode (A)	TM-	Out	In
19	Signal Ground	SG
20	Receive Common	RC
21	N/C
22	Send Data (B)	SD+	Data In	Data Out
23	Send Timing (B)	ST+	Clock Out	Clock In
24	Receive Data (B)	RD+	Data Out	Data In
25	Request To Send (B)	RS+	In	Out
26	Receive Timing (B)	RT+	Clock Out	Clock In
27	Clear To Send (B)	CS+	Out	In
28	Terminal In Service	IS	In	Out
29	Data Mode (B)	DM+	Out	In
30	Terminal Ready (B)	TR+	In	Out
31	Receiver Ready (B)	RR+	Out	In
32	Select Standby	SS	Out	In
33	Signal Quality	SQ	Out	In
34	New Signal	NS	In	Out
35	Terminal Timing (B)	TT+	Clock In	Clock Out
36	Standby Indicator	SB	Out	In
37	Send Common	SC
EIA-423 / RS-423 Pinout Synchronous
Pin	Description	Connector Type	DTE	DCE	Notes
2	Tx Data	25 Way D-Type	Data Out	Data In
3	Rx Data		Data In	Data Out
7	Signal ground	(Can be a variety of Connectors)
15	Tx Clock		Clock Out	Clock In
17	Rx Clock		Clock Out	Clock In
24	Tx Clock		Clock In	Clock Out
X-21 Pinout Synchronous
Pin	Description	Connector Type	DCE	DTE	Notes
2	Tx Data A	15 Way D-Type	Data In	Data Out
9	Tx Data B		Data In	Data Out
4	Rx Data A		Data Out	Data In
11	Rx Data B		Data Out	Data In
8	Signal ground
6	Tx Clock A		Clock Out	Clock In
13	Tx Clock B		Clock Out	Clock In
3	Control A		Handshake In	Handshake Out	Often
10	Control B		Handshake In	Handshake Out	Looped
5	Indication A		Handshake Out	Handshake In	3 - 5
12	Indication B		Handshake Out	Handshake In	10 - 12
V.35 / EIA-442 / RS-442 Pinout (See also EIA-449 Above) Synchronous
Pin	Description	Connector Type	DTE	DCE	Notes
4	Tx Data A	37 Way D Type	Data Out	Data In
22	Tx Data B		Data Out	Data In
6	Rx Data A		Data In	Data Out
24	Rx Data B		Data In	Data Out
19	Signal ground
17	Tx Clock A		Clock Out	Clock In
35	Tx Clock B		Clock Out	Clock In
8	Rx Clock A		Clock In	Clock Out
26	Rx Clock B		Clock In	Clock Out
5	Tx Clock A		Clock In	Clock Out
23	Tx Clock B		Clock In	Clock Out
EIA-530 / RS-530 Pinout Synchronous
Pin	Description	Connector Type	DTE	DCE	Notes
2	Tx Data A	25 Way D Type	Data Out	Data In
14	Tx Data B		Data Out	Data In
3	Rx Data A		Data In	Data Out
16	Rx Data B		Data In	Data Out
7	Signal ground
15	Tx Clock A		Clock In	Clock Out
12	Tx Clock B		Clock In	Clock Out
17	Rx Clock A		Clock In	Clock Out
9	Rx Clock B		Clock In	Clock Out
24	Tx Clock A		Clock Out	Clock In
11	Tx Clock B		Clock Out	Clock In

 

 

 

Pin	Ethernet 10BASE-T	Cross-Over	Standard
1	Transmit +	White with green stripe	White with orange stripe
2	Transmit -	Green with white stripe	Orange with white stripe
3	Receive +	White with orange stripe	White with green stripe
4	N/A	Blue with white stripe	Blue with white stripe
5	N/A	White with blue stripe	White with blue stripe
6	Receive -	Orange with white stripe	Green with white stripe
7	N/A	White with brown stripe	White with brown stripe
8	N/A	Brown with white stripe	Brown with white stripe

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Note that with ethernet cables, connecting a PC or another ethernet device to a hub, switch or router requires a standard cable. Connecting two devices of the same type such as a PC to a PC or a hub to a switch requires the crossover cable. Some hubs and switches have a dedicated or switchable 'Uplink' port which can be used with a standard cable.

 

Next we will look at testing Data Communications.