| Product | Model Name | Chip | COM Expansion | Isolation | Interface | 
|  | NISKECOM3 | N/A | 4 x RS232/422/485 | Yes | 1 x DB26 to 4 x DB9 | 
|  | NISKECOM4 | N/A | 4 x RS232 | No | 1 x DB26 to 4 x DB9 | 
|  | NISKLPT | LPC to Parallel Port Module | N/A | N/a | LPC |