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ABCircuits www.abcircuits.com POB 123 New Hill NC 27562 (919) 290-7104

Part Number SER7

Copyright © 2014 ABCircuits. Revised September 2014 Page 10 of 11

Theory Of Operation

The SER7 IC is a custom programmed microprocessor designed to monitor a serial input and

convert the received data to seven segment format.

When a byte is received on the SIN- pin, bit 8 is cleared. The byte is then saved in the buffer. If

the byte is a carriage return (0D hex) the IC uses the ADR0-3 inputs to determine which two

bytes in the buffer are converted to seven segment format and displayed.

The data is standard asynchronous format 8 data bits, 1 stop bit and no parity. Baud rate is 9600

BPS. It is recommended that the display data be sent periodically even if there is no change, to

recover from power failure or serial data errors.