Many devices such as PLCs, transducers, sensors, cash registers and electronic scales are equipped with as standard RS232 communication port. Standard of RS232 has restrictions on the length of the cable (the distance at which the transmission is working properly is 15m). The solution to this problem is to use for data transmission Current Loop interface. Current Loop Interface allows to connect with each other devices at up to several kilometres.
ADA-1021 converter is a device used to convert RS232 to Current Loop standard without interfering with data format. The converter does not require the power to his operation from the RS232 port, supports asynchronous RS232 data transmission at up to 38.4 kbps by two pairs of twisted-pair. ADA-1021 is equipped with a female DB-9F connector for RS232 interface connection and screw terminal blocks for twisted-pair connections of Current Loop and power supply. DB-9 connector is made as DCE which allows to connect the converter to the PC via the RS232 extension cable (a typical cable modem connection) without crossing Tx with Rx and RTS with CTS. For its operation uses the signals from the RX, TX and mass SG, entered by DB-9F connector to the converter. RTS signal is looped with CTS inside the converter and DTR with DSR and DCD. Others signals are not connected. If it is not needed looping the above signals, can be unsolder the RTS or DTR in the plug DB-9M (pins: RTS-7, DTR-4). To Current Loop line constructed on the ADA-1021 can be connected two converters operating in full duplex or half duplex point-to-point.
This converter has internal, low energy surge protection (600W overvoltage diodes) for each Current Loop lines however it is recommended to use the external lightning arresters (typical protection of telephone line) for the lightning protection of lines.
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