Akai S1000 / S1100 samplers

Hello everybody
   I bought an S1100 EX and i just can't figure out how to make it work, if i connect a midi cable to the EX i can get sound from it (like a sine wave) but when connected  to the S1100 sampler is like nothing happens, there isn't any indication in the sampler that the expander is connected, when booting up i can't see the memory from the expander in the sampler, i don't know what i'm doing wrong, i haven't been able to find the manual for the S1100EX, i thought that by connecting the 2 units with the scsi cable i would link the 2 units but that isn't happening, the sampler has the 4.3 OS  and the expander has the 1.39 chips installed, could anybody please help me out with this ? i would appreciate any help. Thank you