- X500 Expansion board, 1xRS-232, 9-pin
- X503 Expansion board, 1xRS-232, 5-pin
- X510-128 Expansion board, 1xRS-232, 5DI, 5DO
- X510 Expansion board, 1xRS-232, 5DI, 5DO
- X504 CR Expansion board, 2xRS-232, 5/9-pin
- X508 CR Expansion board, 1xRS-232, 4DI, 4DO
- X501 CR Expansion board, 1xRS-232, 5-pin
- X502 CR Expansion board, 2xRS-232, 5/3-pin
- X505 CR Expansion board, 3xRS-232, 5-pin
- X507 CR Expansion board, 1xRS-422/485, 4DI, 4DO
- X509 CR Expansion board, 2xRS-232, 4DI, 4DO
- X511 CR Expansion board, 3xRS-485, 2-pin
- X518 CR Expansion board, 1xRS-232, 8DO, 5-pin