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3.4 Communications Protocols
The BHT supports both the BHT-protocol and the BHT-Ir protocol for file transmission.
3.4.1 BHT-protocol
[ 1 ] Overview
The BHT-protocol is the communications procedure used to transmit files between the BHT and a host
(or between the BHTs). It adopts the response method using ACK/NAK codes.
The BHT-protocol is composed of a defined set of the control character sequences including the
following three phases:
Phase 1: Establishment of data link
The sending station confirms that the receiving station is ready to receive data.
Phase 2: Data transmission
The sending station transmits data to the target receiving station.
Phase 3: Release of data link
The sending station confirms whether or not all of the transmitted data has been correctly
received by the receiving station. If yes, the sending station terminates the data
transmission and releases the data link.
For details about the transmission control sequences and horizontal parity checking, refer to Appendix B,
B.1, "BHT-protocol."
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