... Could select 5VDC, 12VDC, 24VDC auxiliary power supply for sensors and transmitters.(option).Could select 4-20mA, ... RS485, RS232 serial interface. MODBUS-RTU communication protocol are available for configuration with MCGS and others professional software. ... ,4GB USB flash driveCommnication:RS485,RS232, MODBUS-RTU protocol for configuration with PCPrinting Function: RS232, connecting mini printerVarious ...