Specifications
PK-232 OPERATING MANUAL COMMAND SUMMARY
PTHUFF “n” Default: 0
Mode: Pactor Host: pH
"n" — 0 to 3, specifying a type of compression that may be used in Pactor.
To enhance the effective data rate in Pactor, a data compression scheme called
may be automatically enabled.
0 - is no compression (default).
1 - is Huffman encoding.
2,3 - presently not implemented but reserved for future use.
Instead of using the normal 8 bit ASCII representation of a character, Huffman
encoding assigns each character a code that may be as few as 2 bits for the most
used characters to as long as 15 bits for the least used characters. For English
(and most other) languages, the use of Huffman compression results in a smaller
number of bits necessary for a given message. For messages consisting of non-
text information such as computer programs, Huffman compression would need more
bits than ASCII and would be less efficient.
If PTH is set off, Pactor will never use Huffman compression. When PTH is set
on, Huffman compression will be used if it is more effective. Do not use Huffman
compression with binary file transfers as it only works with 7 bit data.
PTList Immediate Command
Mode: Pactor Host: PN
PTList is an immediate command that switches your PK-232 into the Pactor listen
mode.
You can usually monitor a Pactor contact between two connected stations using the
Pactor listen mode. Since your station is not part of the error free link, if
the CRC check does not produce a correct check sum, nothing will be displayed.
If the receiving station requests a repeat, and you have copied the packet, it
will not print twice.
PTOver “n” Default: <CTRL-Z> ($lA)
Mode: Pactor Host: PV
“n” —
A hexadecimal value from $00 to $7F used to select the change-over
character used in linked Pactor. The default is <CTRL-Z>.
PTOver is the character, conventionally <CTRL-Z>, that is used to change the
direction of data transmission in a linked Pactor operation.
When you
are
finished transmitting information and you are ready to receive information from
the other station, use the PTOver character. Also see AChg.
2/93 A-65b
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