Silicon Laboratories SI2493/57/34/15/04 - Manual (Page 240)

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240 Rev. 1.3
Figure 38. Diagram of Handshake (Using CAS/CAS ACK) and Message Packet Exchange
POS Server
Send FSK Packet
CAS
Send FSK Packet
CAS Ack
(Complete the CAS Handshake)
Send FSK Packet
TS1
TS3
TS5
TS4
TD 3
TS 2
TD 1
TD 2