Denso BHT-200QW Dokumentacja Strona 132

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8.4.4 Overview of Communications Protocols
The BHT supports two communications protocols—BHT-protocol and BHT-Ir protocol for file
transmission. Using the XFILE statement, the BHT may upload or download a file according
to either of these protocols.
[ 1 ] BHT-protocol
This protocol may be used also in System Mode.
For the communications specifications of the BHT-protocol, refer to the BHT User's Manual.
Primary station and secondary station
Primary station and secondary stationPrimary station and secondary station
Primary station and secondary station
The primary station and the secondary station should be defined as below.
When uploading data files
Primary station:
Secondary station:
BHT
Host computer
When downloading data files
Primary station:
Secondary station:
Host computer
BHT
Protocol functions
Protocol functionsProtocol functions
Protocol functions
In the BHT-protocol, using the following protocol functions may modify a transmission header
or terminator in a send data:
For a header: SOH$ or STX$
For a terminator: ETX$
Field length that the BHT
Field length that the BHTField length that the BHT
Field length that the BHT-
--
-protocol
protocolprotocol
protocol can hand
can hand can hand
can handle
lele
le
When the BHT transmits files according to the BHT-protocol, each field length should be a
maximum of 254 bytes.
In file transmission, the host computer should also support the same field length as the BHT.
The MS-DOS–based Transfer Utility supports the field length of up to 99 bytes; the
Windows-based Transfer Utility supports up to 254 bytes.
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