The A151 Reference Card converts the stepped inputs from an operators controller – normally 4 or five notch – to an analogue output speed reference for use by the A130 (Hoist) and A131 (Travel) Amplifiers. Each step input has an analogue output value that is adjustable via buttons
PB1 (DOWN speed) and PB2 (UP speed) and the digital display. The A151 card uses an 8-bit micro controller type PIC 16F873 with EEPROM.