RS-485 TO I/O CONVERTER CARD; EQUIPMENT: HOLE DETECTOR; COMPONENT: ELECTRONIC CARD; RS-4 85 TO I/O CONVERTER CARD; EXTENDS COMMUNICATION CARD DIGITAL I/O LINES FROM ROM 12 TO 16; 4 CHANNELS RS485 TO I/O CONVERTERS; SPECIFIC CARD COMPATIBLE WITH DETMASTER 1200MPH; MODEL: DETMASTER 1200MPH