B&B Electronics 232OPSDA manual DB25S

Table 2.2 - RS-232 Connector Pinout

DB25S				232OPSD
	Pin #		Signal	A Function				Notes
2		Transmit Data (TD)		Input			Connection is required.
3		Receive Data (RD)		Output			Connection is required.
4		Request to Send (RTS)		Input			Used for power.
5		Clear to Send (CTS)					Internally connected to
							RTS (pin 4).
6		Data Set Ready (DSR)					Internally connected to
							DTR (pin 20).
7		Signal Ground (SG)					Connection is required.
8		Data Carrier Detect (DCD)					Internally connected to
							to DTR (pin 20).
12		Signal Ground (SG)
20		Data Terminal Ready		Input			Used for power.
		(DTR)
25		Optional Power Supply					Connect Power Supply
		Connection					to this pin if RTS and
							DTR are not available
			Table 2.3 - 232OPSDA To DTE Connections
	232SPDA				DTE DB-25			DTE DB-9
	Pin #		Signal		Connection			Connection
	2		Transmit Data (TD)			2		3
	3		Receive Data (RD)			3		2
	4		Request to Send (RTS)			4		7
	5		Clear to Send (CTS)			5		8
	6		Data Set Ready (DSR)			6		6
	7		Signal Ground (SG)			7		5
	8		Data Carrier Detect (DCD)			8		1
	20		Data Terminal Ready (DTR)			20		4

Table 2.4 - 232OPSDA To DCE Connections

232OPSDA		DCE DB-25	DCE DB-9
Pin #	Signal	Connection	Connection
2	Transmit Data (TD)	3	2
3	Receive Data (RD)	2	3
4	Request to Send (RTS)	5	8
5	Clear to Send (CTS)	4	7
6	Data Set Ready (DSR)	20	4
7	Signal Ground (SG)	7	5
8	Data Carrier Detect (DCD)	N/C	N/C
20	Data Terminal Ready (DTR)	6	6

8Documentation Number 232OPSDA1397 Manual

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