1.Real user programmable DDC controller. 2.Full function for HVAC and BAS control. 3.Very ... logic, it is free too!1.6 General-utility I/O port technology, AI and DI,AO and DO can exchange ... %~50% saving cost than others.1.10 PDDC3026 DDC I/O ports : AI(temperature*4,0-10VDC*4),DI*6,AO ... *4,DO*8.1.11 PDDC3026 ExtendI/O ports: AI(temperature*4,0-10VDC*4),DI*8,AO ...