Intermec 6200 Guía De Referencia

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Under the NORAND standard file transfer session, the HHC always uploads

first.  Once all upload files are sent, the line is turned around and the host then

sends any download files.  Each file is preceded by a header record that gives the

receiving computer information about the format used by the file.
The HHC must first send a session control file, which identifies the HHC to the

host computer.  The HHC may then send a download request file.  This optional

file prepares the host computer to download one or more files to the HHC.

Upload files can then be sent to the host.

To identify itself to the host, the HHC sends the session control file at the

beginning of a TCOM session.  The applicationĆdependent HHC ID is used by the

host to determine which files to downloading to the HHC.  The format of the

session control file is as follows:

<DSCNTRL00001Xnnn>PPPPPPPPPPPPPPTTTTTTTTTTTTTTTTYYMMDDHHMMSS . . .

where:

               < = beginning of file header
               D = file type (fixed)
          SCNTRL = file name (fixed)
           00001 = decimal number of records in file (fixed)
               X = data type (ignored by host)
             nnn = decimal number of bytes in file record
               > = end of file header
  PPPPPPPPPPPPPP = program identification
TTTTTTTTTTTTTTTT = hand-held computer ID (determined by application)
          YYMMDD = date
          HHMMSS = time
           . . . = additional HHC information

The application determines the actual data in the session control file.  The data

fields shown in the preceding list represent a convention used in applications

from Intermec Technologies Corporation.  However, the session control header

always consists of 18 bytes.  Also, NORAND host communication packages

usually expect to find the HHC ID starting in byte 33 of the data stream.

Although, this location is configurable.

An HHC may directly request specific files from the host.  To do this, it sends a

download request file to the host immediately after sending the session control

file.  The requested files are not downloaded at that moment, but rather after

the line is turned around.
If a download request file is sent, the host does not use the HHC ID in the

session control file to determine which files to download to the HHC.  Only files

requested in the download request file are downloaded.

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