serial communication between slcd5 and arduino mega2560

Hi all I got a problem connecting my SLCD5 WVGA v1.2.49 from REACHTECH compant with arduino mega 2560. All the information online dealing with LCD and arduino requires a sparkfun serial LCD or at least compatible with Hitachi LCD, my SLCD5 has different pins thus i am struggling with the connections. In addition, for my SLCD, i don't think the liquidcrystal.h library works. Is there a specific library that i need to download or just simply write the code Serial.print() in order to get something displayed on my SLCD?

Link to the spec sheet? I can't find the slcd5. The software guide requires registration too. If you want some help, do some homework, post the spec sheet link and software guide online.