I want to connect a display to this devboard http://www.mikroe.com/eng/products/v...6b-plc-system/ and it has the MAX232 onboard.

Do I have to use a MAX232 in both ends (display and devboard) or just that one on the devboard.

If you take a look at this display http://www.sparkfun.com/datasheets/LCD/SerLCD_V2_5.PDF it take incoming "TTL level" signals, should I still use a MAX232 whit this display, the MAX232 converts the PICīs TTL signals to RS232 signals that has a voltage upp to -+10 volts so if I have a MAX232 at the sender side I will damage the 16F88 on the display hardware if I donīt convert the RS232 signals back to TTL level signals?