OMRON BASIC Unit CV500-BSC21
CV500-BS CPU Bus Unit BASIC Unit CV500-BSC21
RS-232C: 2 ports, RS-422: 1 port.

OMRON BASIC Unit CV500-BSC41
CV500-BS CPU Bus Unit BASIC Unit CV500-BSC41.
RS-232C: 2 ports.
Centronics: 1 port.
(w/EEPROM).

OMRON BASIC Unit CV500-BSC11
CV500-BS CPU Bus Unit BASIC Unit CV500-BSC11.
RS-232C: 2 ports, RS-422: 1 port.

OMRON BASIC Unit CV500-BSC51
CV500-BS CPU Bus Unit BASIC Unit CV500-BSC51.
RS-232C: 1 port.
GP-IB: 1 port.
(w/o EEPROM).

OMRON BASIC Unit CV500-BSC61
CV500-BS CPU Bus Unit BASIC Unit CV500-BSC61.
RS-232C: 1 port.
GP-IB: 1 port.
(w/EEPROM).

OMRON BASIC Unit CV500-BSC31
CV500-BS CPU Bus Unit BASIC Unit CV500-BSC31.
RS-232C: 2 ports.
Centronics: 1 port.