December 2001 Data Transmission Protocols 8 – 25
Report error to the
TNC
FE1 mode is set.
If an error occurs at a peripheral device, the following block must be sent to
the TNC:
<SOH><Error text><ETB>BCC
The received error message is displayed on the TNC. To continue
7
77
7 Press the CE key
Request external
directory
FE1 mode is set.
This protocol is not available in FE2 and EXT mode. In FE1 mode the following
'Escape' sequence is sent to request the external directory:
<DC3><ESC><DC1><0><SP><D><CR><LF>
The TNC expects the following input to this request:
xxxxxx<Code letters><Sectors><Name><P
1)
><CR><LF>
1)
P = Protected (optional)
The first four lines ending in <CR><LF> are ignored. In subsequent lines
ending with <CR><LF>, the program name and, after any number of blank
characters, the number of sectors are stored.
If the character combination <FREE:> is detected, only a number — the
number of free sectors — will be read in.
The TNC requests the complete directory. The directory is saved and the files
of the selected type are displayed.
The peripheral device ends transmission with <EXT>. The TNC sends an
<EOT>.
Output selected file
Peripheral to TNC TNC to peripheral
<SOH>“Error”<ETB>BCC <ACK><EOT>
TNC to peripheral Peripheral to TNC
<SOH><K>Name<A><ETB>BCC
<SOH><K>Name<A><ETB>BCC
<STX>“1st line”<ETB>BCC <ACK>
... ...
<STX>“last line”<ETB>BCC <DC1> <ACK>
<ETX><EOT>
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