The A-626,A-628 are 12-bit analog output boards with 16 channel digital input and 16 channel digital output .The A-626,A-628 boards support both current and voltage range .The output channel can be jumper selectable for different voltage range ;+/-10 V, +/-5 V, 0 ~ 5 V, 0 ~ 10 V and can sink 4 ~ 20 mA current when connected to an external voltage source. On board reference chip BB Ref-01 is used for solving the thermo-drifting problem of the reference voltage Therefore A-626 is much better than 726 families for long period operation. Lattice FPGA on board can increase the stability of the board. Mounted DB-37 (37 pin D-sub connector)