Before revision: The receivers converts the TIA-232 input voltages (up to ±25 volts ) ( MAX232 supports ±30 volts) to standard 5 volt TTL levels.
After revision: The receivers translates the TIA-232 input voltages (up to ±25 volts , thoughup todown MAX232 supports ±30 volts) to standard 5 volt TTL levels.