CAS40 packet format¶
All packets in the CAS40 protocol are introduced by a single byte, which defines the basic purpose of the packet, and defines the kind of payload that follows it.
See the following sections for more information.
0x06 – Acknowledge packet¶
This packet is sent by the receiver to the sender to acknowledge reception of a header or data packet. It is a single-byte packet, i.e. it has no payload.
See Send or receive data for more information.
0x13 – Established packet¶
This packet is sent by the receiver to the sender on initiation, in response to a 0x16 – Start packet. It is a single-byte packet, i.e. it has no payload.
See Initiate the connection for more information.
0x16 – Start packet¶
This packet is sent by the sender to the receiver on initiation. It is a single-byte packet, i.e. it has no payload.
See Initiate the connection for more information.
0x3A – Header and data packet¶
Whether this is a header or data packet depends on the context in the Send or receive data flow.
See CAS40 data types for more information.