The Model #77 is a large 3" digit bright Red LED Digital Indicator that can be factory programmed for the following modes:

Model #77/232 Large Digit Serial Input w/ Numeric Display.

Operates on a 2 wire data bus receiving ASCII serial data at user selectable baud rates. They can be used in stand-alone display applications or as one display in a multi-station network, even when the displays are thousands of feet apart. Each display has a plug-in communications board that determines the type of serial input the unit accepts and the type of serial output the unit retransmits. Retransmission eliminates limitations of distances between displays and the number of displays that can be serviced from a single users port. Up to 98 displays can be individually addressed on the two wire bus through the use of internal address dip switches.