... . 3.Very easy to learn and use. 1 PDDC3026 GUIDE1.1 PDDC3026 is a Direct Digital Control for HVAC( ... keyboard or COMPUTER download, secondary program software is free!1.4 Two way download program,from COM or the ... for test your control logic, it is free too!1.6 General-utility I/O port technology, AI and DI, ... : AI(temperature*4,0-10VDC*4),DI*6,AO*4,DO*8.1.11 PDDC3026 ExtendI/O ports: AI(temperature* ...