Anything related to the MAX232 integrated circuit. The MAX232 IC is used to convert serial communication signals using TTL levels, such as those produced by UARTs ICs, from and to standard RS-232 line signals.

Anything related to the MAX232 integrated circuit. The MAX232 IC, described in its datasheet as a dual EIA-232 driver/receiver, is used to convert serial communication signals using TTL levels, such as those produced by UARTs ICs, to standard RS-232 line signals.

See also Wikipedia on MAX232 IC and Texas Instruments MAX232 datasheet.