A1700 RS232 module allows direct connection to any RS232 communications device through a standard 25-way D-type connector. The module has a 10V 80mA supply to power a modem.

The power is provided via the 25-way connector allowing the modem to plug directly into the module beneath the terminal cover. A row of terminals allows up to 10 meters to be connected in multi-drop mode, therefore reducing communications costs. The multi-drop connection can be over a distance of up to 12 metres.