... , etc, please indicate when ordering;3, 4/5/6 digit display, with demical point switched automatically; Opical isolation for input and output ... ,high anti-interference.4, Output: up to 3 alarm output with various output modes selectable; high value, low value, intervals, etc ... . analogue output 4-20mA or 0-10mA with range settable.5, RS232 or RS485 Modbus RTU protocol, connectable ...