Specifications

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8.4.3 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
The primary station and the secondary station should be defined as below.
• When uploading data files
Primary station: BHT
Secondary station: Host computer
• When downloading data files
Primary station: Host computer
Secondary station: BHT
■
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-protocol can handle
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.