The MAX3318 uses charge pumps to convert the supplied voltage to the IC into RS232 compliant voltages on the output, therefore different Vcc voltages can be used for each MAX3318 IC and still communicate with no issues.
The MAX3318 uses charge pumps to convert the supplied voltage to the IC into RS232 compliant voltages on the output, therefore different Vcc voltages can be used for each MAX3318 IC and still communicate with no issues.