3 communications protocols, 1 bht-protocol, 1 ] overview – Denso BHT-7000 User Manual

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Chapter 3. Communications Operations of BHT-7000

3.3 Communications Protocols

The BHT-7000 supports both the BHT-protocol and the BHT-Ir protocol for file trans-
mission.

3.3.1 BHT-protocol

[ 1 ] Overview

The BHT-protocol is the communications procedure used to transmit files between the
BHT-7000 and a host (or between the BHT-7000s). 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."