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Serial Interface

The CPLD Module supports an RS-232 interface via the DB-9 Male connector. The received serial data from Pin 2 of the DB-9 is brought to logic levels via inversion from a MAX 233 and is made available on Pin 12 of CPLD 1. The data to be transmitted is presented at Pin 73 of CPLD 1, which appears on Pin 3 of the DB-9 after being inverted by the MAX 233. Please see /mit/6.111/vhdl/serial/ for VHDL code that emulates a receiver and a transmitter.