Rf solutions zulu 868mhz wireless serial data radio modem modules rf solutions zulu2 m868 so the zulu 2 m868 so modem module is a highly integrated rf modem and intelligent controller with a simple interface it can achieve a wireless serial data link at up to 38k4bps over a 2km range the range can be extended by using a suitable antenna the module now includes an on board crystal xtal for simpler integration the user interface is standard rs232 operating at low voltageall rf operation