... One alarm for ON/OFF control 2011--HHE series Digital Timer Counter,Timer Relay(Latest)HH4 series, 48*48*80mm,dual line ... RS232 or RS485 communication ( Modbus RTU protocol) for your option.7) Power supply: 90--265V AC/DC; 24V DC for option ... manufacture thousands of different models of products, including Temperature Controller, Digital Adjustor,thermocouple (TC and RTD), Panel Meter, Sensor Meter, ...