Each module of the M4KCAN (Controller Area Network) contains up to six channels, each containing 256 bytes of dual-port RAM for Data Blocks and control registers. All Data Blocks and control registers are memory mapped, and may be accessed in real time.

The M4KCAN modules support the standard and extended message frames in CAN Specification 2.0 part B. They have the capability to transmit, receive, and perform message filtering on extended message frames with a 29-bit message identifier. Due to the backwardly compatible nature of CAN Specification 2.0B, the M4KCAN also fully supports the standard message frames in CAN Specification 2.0 part A.

The M4K825CAN is an intelligent multichannel ARINC 825 (CAN bus) interface module for the multiprotocol Excalibur 4000 family of carrier boards. The module supports up to ten ARINC-825 channels. In receive mode, the module stores all or selected messages with status and Time Tag information appended to each message. In transmit mode, the module operates via a transmit Bandwidth frame which allows scheduling of data transmissions and reduces the need for host computer intervention.