The FPL3’s built-in modem minimises demand for external components. The modem has inverted-RS232 serial interfaces at 5V CMOS voltage level, which enables direct connection to a UART or host microcontroller without a driver or level shifter. The FPL3 also integrates firmware for managing data timing and formatting at the radio interface, which saves the user keying the transmitter on or off and ensures dependable link latency.
With maximum serial data rate of 9600 baud and radio range of more than 3 km, depending on operating conditions, the FPL3 can be used in security systems, fire-warning systems, industrial controls or telemetry, asset tracking, and control of remotely operated vehicles (ROVs).
The eight-channel radio is programmed for 869.475MHz and 869.565 MHz in the EU, with channels 4-7 set to 869.50 MHz for backward compatibility. The 67 x 30 x 12 mm module operates from a single 5V supply, and draws 50 mA in receive mode and 500 mA when transmitting at 400 mW (+26 dBm) RF output power. The FPL3 conforms to ETSI EN 300 220-2 (radio) and EN 301 489-3 (EMC) standards.