Advantech BB-485COSR

Model 485COSR, RS-232 to RS-485 converter, converts unbalanced, full-duplex RS232 signals to balanced full-duplex (4-wire) or half-duplex (2-wire) RS-485 signals.

The RS-232 port has a female DB25S connector with pins 2 (TD input) and 3 (RD output) supported. Protective Ground (pin 1) and Signal Ground (pin 7) are also passed through. Pins 4 (RTS) and 5 (CTS) are tied together. Pins 6 (DSR), 8 (CD), and 20 (DTR) are tied together, but not passed through the converter.

The RS-485 port has a male DB25P connector with Send Data outputs on pins 2 and 14, and Receive Data inputs on pins 3 and 16, or 5 and 17. No special software requirements are needed since the RS-485 driver is enabled by the first transition on the RS-232 side of the Transmit Data line (Pin 2). Any transmission on the TD line keeps the RS-485 driver enabled by preventing the monostable multivibrator from timing out. The transmitter is disabled approximately 1 ms after the last transmitted character. This 1 ms timeout allows continuous transmission of data at 9600 baud or higher.

SPECIFICATIONS

SERIAL TECHNOLOGY
Data Rate	115.2 kbps maximum
RS-232 Connector	DB25 female
RS-485 Connector	DB25 male
Signals	Converts RS-232 to RS-485
Operation	2-wire half-duplex or 4-wire full-duplex
Biasing Resistors	4.7k Ohms
Termination	None
POWER
Power Requirement	12VDC external power supply (sold separately)
MECHANICAL
Dimensions	5.4 x 6.2 x 1.5 cm (2.1 x 2.4 x 0.6 in)
ENVIRONMENTAL
Operating Temperature	0 to +70 °C (+32 to +158 °F)
Storage Temperature	-40 to +85 °C (-40 to +185 °F)
Operating Humidity	0 to 95% non-condensing
APPROVALS / CERTIFICATIONS
	FCC
	CE
2014/30/EU	Electromagnetic Compatibility Directive
2011/65/EU	Reduction of Hazardous Substances Directive (RoHS)
2012/18/EU	Waste Electrical and Electronic Equipment (WEEE)