ZBA Inc .Page 10 of 331.5.8. Packet Example:If a record data is "ABCD" with STX/ETX, SEQ and CKS enable, assume SEQ is‘0’ (030H) the send out data is format as:02H + 030H + "ABCD "+ 03AH + 03H030H + 041H (A) + 042H (B) + 043H (C) + 044H (D) = 013AHChecksum = 013AH – 080H= 0BAH Å Still greater than 07FH so repeatChecksum = 0BAH – 080H= 03AHThe Checksum is calculated by adding all data bytes in the packet exceptSTX and ETX. If the result is over 07FH (ASCII extend) subtract the result by080H, if the result is less than 020H (ASCII control code) add 020H to theresult. This will make sure that the checksum will be in the range of visuallyrecognizable ASCII characters.1.5.8 ACK/NAK Control1.5.9. Connection Lost:If during the communication period there is an extended time where there is noresponse, the PDC assumes that the connection is lost as would be the case fora TIMEOUT. The PDC will display “Connection Lost”.Ti view the full instructions for Bluetooth® operation, please refer toDevice Setup, Communication.