Emax

hello i was wondering if someone could help me with this.
i have an emax2 i recently bought an external iomega zip 100 which i 
hooked up to the scsi port on the back of the emax, powered up the 
drive and then turned on the emax. when the zip drive is hooked up my 
emax cannot find it or my internal hd which is scsi#1. floppy is 
scsi#0 zip drive is not found at all. i'm sure i'm doing somthing 
wrong but i cannot find out what. any help would be greatly 
appreciated.
thank you.