The ST-71 16 Channel Alarm Controller provides simultaneous display and alarm functions for up to 16 monitored variables. The ST-71 may function as a critical alarm controller for hazardous gases, vibration, tank levels and many other process variables. ST-71's come with Modbus Master/Slave RS-485 ports and 4 five amp alarm relays. Options include wireless Modbus, discrete alarm relays and analog outputs.