... relay drivable outputs(12V-24V),4 Analog Inputs and up to 8 NC/NO inputs and RS232 Serial Port. It allows you to ... ). (The Different from RTU5010 is the GSM Controller RTU5011with 8 Digital NC/NO inputs,8 relay drivable Outputs, 4 Analog inputs ... us. Skype: Samchinese New Upgrading,GSM SMS Controller,RTU5011,Temperature UP DOWN remote control,24V DC Switch,NC NO sensor control