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Many devices as PLC controllers, sensors, measuring transducer, cash registers, electronic weight are equipped with RS232 communication port. The standard has limitation of the lengths cable (the distance 15m which transmissions correctly). Using the RS485/422 standard to the data transmission is solving this problem. The RS485/RS422 standard lets to connect devices dismissed about 1200m.
ADA-I1040 converts RS232 to RS485/RS422 without interference in data format. This converter does not require powering from RS3232 port, supports the asynchronous baud rate up to 230.4 kbps through four or two-pair of twisted-pair cable of RS485/RS422 interface.
Converter has female DB-9F connector for connection of RS232 interface and screw terminal block for connection of RS485/422 bus and power. Additionally has also JACK socket for power supply. This DB-9F connector has made as DCE, what let connect the converter to other RS-232 devices, by the use RS232 extender cable (typical modem connection cable) without crossover Tx with Rx, RTS with CTS, DTR with DSR.
Converter use for functioning Rx, Tx, RTS signals and GND (inserted by the DB-9F socket). Galvanic isolation and optoisolation in signals channel separate RS232 interface from RS485/RS422 and protect device connected to RS232 port from over-voltage on RS485/RS422 Bus and power circuit. Over-voltage protection on each RS485/RS422 line was made on base of over-voltage led and fuses.
ADA-I1040 should be power from stabilized power supply unit with a voltage ranging from 10 - 30 VDC and minimum power 1W. Converter can be powered from two independent sources, one connected to terminal block second to the JACK 1,5/3,5 connector.