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CAS100 protocol – Serial protocol used by AFX / Graph 100

The CAS100 protocol is an variation of CAS50 specific to the AFX / Graph 100, used between 1999 and 2003.

Note

The term was coined by Thomas Touhey, as an evolution of CAS50 at “double the speed”, which was actually a mistake since:

• The rendez-vous baud speed of this protocol is 38400 bauds, and not 19200 (which means it is actually quadruple the speed);

• Headers are actually 40 bytes long, not 50.

The name was kept however, because 100 also references Graph 100, the French model variation implementing this protocol.

This protocol is usually present over Serial transport. Serial settings are always the same, and do not vary during the transfer:

• Speed: 38400 bauds.

• Parity: none.

• Stop bits: 2.

See the following sections for more details regarding the protocol.

• CAS100 packet format
  • 0x06 – Acknowledge packet
  • 0x13 – Established packet
  • 0x16 – Start packet
  • 0x3A – Header and data packet
  • 0x3E – Segment packet
• CAS100 data types
  • ADN1 headers
  • ADN2 headers
  • BKU1 headers
  • END1 headers
  • FCL1 headers
  • FMV1 headers
  • MCS1 headers
  • MDL1 headers
  • REQ1 headers
  • REQ2 headers
  • SET1 headers
• CAS100 flows
  • Initiate the connection
  • Send data