The Acc-14E 48-Input/Output Board provides 48 discrete digital I/O points at 5V levels. It connects to the Interface/CPU board through the backplane expansion port. The typical use of the Acc-14E is for parallel position feedback devices like absolute encoder and laser interferometers. Each Acc-14E board has 48 bits of input. Therefore, it may be connected to two parallel feedback devices of up to 24 bits each, or one of over 24 bits. A secondary use of this accessory is for connections of regular digital I/O points provided by an Opto-22TM or compatible I/O module boards. Two 50-pin IDC headers, top edge and bottom edge, are provided for connection to I/O points. This accessory is intended for UMAC use only.