B&B Electronics RS-232 Connector Pinout, 232SDD16 To DTE Connections, Power Supply Connections

Table 2.2 - RS-232 Connector Pinout

		Signal
DB-25S		Direction at
Pin #	Signal	232SDD16	Notes
2	Transmit Data (TD)	Input	Connection is required.
3	Receive Data (RD)	Output	Connection is required.
4	Request to Send	Input	May be used to power
	(RTS)		unit if kept high.
7	Signal Ground (SG)		Connection is required.
20	Data Terminal	Input	May be used to power
	Ready (DTR)		unit if kept high.

Table 2.3 - 232SDD16 To DTE Connections

232SDD1		DTE DB-	DTE DB-9
6 Pin #	Signal	25	Connection
		Connection
2	Transmit Data (TD)	2	3
3	Receive Data (RD)	3	2
4	Request to Send (RTS)	4	7
7	Signal Ground (SG)	7	5
20	Data Terminal Ready (DTR)	20	4

Table 2.4 - 232SDD16 To DCE Connections

232SDD16		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
7	Signal Ground (SG)	7	5
20	Data Terminal Ready	6	6
	(DTR)

232SDD16-1005 Manual 7

Power Supply Connections

Power to the 232SDD16 can be supplied by the RS-232 serial port handshake lines (RTS, DTR) or by an external power supply through the 2.5mm power jack or from the I/O connector. Most serial ports can provide enough power to supply the 232SDD16’s 15 milliamp requirement. If you plan to use this method to power the unit, your software must set the RS-232 RTS and DTR lines to the high state. An external power supply must be able to supply 8 to 16 Vdc at 35ma.

NOTE: Power requirements of the module does not include the power consumption of any external devices connected to the module. Therefore, any current that is sourced by the digital outputs must be added to this value and the current must not exceed the maximum output source current. Refer to the 232SDD16 Specification Section of this manual.

8 232SDD16-1005 Manual

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