81P-0130; Opto1 optocoupler input module for the Graves Electronics Controller Board
81P-0001; uses the
NXP PCF8574A chip for I/O functions; accepts a wide range of input voltages; utilizes an ON Semiconductor optocoupler (Part #H11L1M, Schmitt trigger, inverting output chip); plugs into either of the module ports on the controller board; uses I²C bus to communicate with the microcontroller; DIP switches to enable address selection or to engage or disengage pull-up resistors for the I²C bus; interfaces to outside world via 10-position pluggable terminal block; 2.00" x 2.44", max. component height 0.36" top of board
