Denso BHT-8000 User Manual page 208

Data transmission may accidentally involve various types of errors. The BHT-Ir protocol is designed to
recover from those errors as frequently as possible. What follows is the BHT-Ir protocol for phases 1
through 3.
Phase 1: Establishment of Data Link
! Normal phase 1
The sending station transmits a sequence of DLE ENQ and IDm (sending station's ID) to the receiving
station. Upon receipt of a sequence of DLE ACK and IDs (receiving station's ID) from the receiving
station, the sending station shifts to phase 2.
! Phase 1 with iterated transmission of DLE ENQ and IDm due to no response or invalid
response
If the sending station receives no response or any invalid response from the receiving station in
response to the sent sequence of DLE ENQ and IDm, then it iterates sending of the sequence at
0.5-second intervals up to 60 times.
If the sending station receives a sequence of DLE ACK and IDs before sending the sequence of DLE
ENQ and IDm 60 times, then it shifts to phase 2.
You may modify the number of iterations of a sequence of DLE ENQ and IDm for the sending
station. The default is 60 times at 0.5-second intervals. For details, refer to the SET PROTOCOL
screen in System Mode (pp. 63 and 65) and the XFILE statement given in "BHT-BASIC
Programmer's Manual."
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Appendices