RS232 Optoisolator

Configuration.

• Handshake lines are jumper selectable.
• Full duplex is supported with one data line and one handshake line in each direction.
• Data line only mode of operation is also possible.
• It is recommended that handshake lines should be connected to the Optoisolator even if they are not used.

DCE connector

D25  male shell (receptacle) female (socket) contacts

pin	I/O	function	description  
-------------------------------------------------------------------
7				signal ground
data lines
2	I	Tx		Transmit Data
3 	O 	Rx		Receive Data
Jumper selectable handshake input
4	I	RTS		Request To Send	
20	I	DTR		Data Terminal Ready
Jumper selectable handshake output
5	O	CTS		Clear To Send
6	O	DSR		Data Set Ready
8	O	DCD		Data Carrier Detect

DTE connector

D25  female shell (plug connector) with male (pin) contacts

pin	I/O	function	description  
-------------------------------------------------------------------
7				signal ground
data lines
2	O	Tx		Transmit Data
3 	I 	Rx		Receive Data
Jumper selectable handshake output
4	O	RTS		Request To Send	
20	O	DTR		Data Terminal Ready 
Jumper selectable handshake input
5	I	CTS		Clear To Send
6	I	DSR		Data Set Ready
8	I	DCD		Data Carrier Detect