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This is a universal RS-232 to RS-485 interface converter.
It gets power from the RS-232 Serial port, the power dissipation is less than 10mA.

Features

• RS-485 Half-Duplex mode available
• ESD Protection: +/-15kV - Human Body Model
• Surge Protection: 1,500W
• Slew-Rate Limited for Error-Free Data Transmission
• Allows up to 32 Transceivers on the Bus
• ADDC - Auto Data Direction Control
• Data Rate up to 115.2Kbps

Applications:

• RS-232 Serial Port Distance Extender
• Change RS-232 Interface to RS-485 Interface
• Change RS-485 Interface to RS-232 Interface

PIN Description:

DB9 Female, RS-232 Side:

PIN	NAME	FUNCTION
2	RD	Transmit Data to DTE
3	TD	Receive Data from DTE
5	GND	Ground

DB9 Male, RS-485 Side:

PIN	NAME	FUNCTION
1	485-	Inverting Receiver Input and Inverting Driver Output
2	485+	Non -inverting Receiver Input and Non-inverting Driver Output
5	GND	Ground