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<strong>PK</strong>-<strong>232</strong> OPERATING MANUAL<br />
COMMAND SUMMARY<br />
PTHUFF “n” Default: 0<br />
Mode: Pactor<br />
Host: pH<br />
"n" — 0 to 3, specifying a type of compression that may be used in Pactor.<br />
To enhance the effective data rate in Pactor, a data compression scheme called<br />
may be automatically enabled.<br />
0 - is no compression (default).<br />
1 - is Huffman encoding.<br />
2,3 - presently not implemented but reserved for future use.<br />
Instead of using the normal 8 bit ASCII representation of a character, Huffman<br />
encoding assigns each character a code that may be as few as 2 bits for the most<br />
used characters to as long as 15 bits for the least used characters. For English<br />
(and most other) languages, the use of Huffman compression results in a smaller<br />
number of bits necessary for a given message. For messages consisting of nontext<br />
information such as computer programs, Huffman compression would need more<br />
bits than ASCII and would be less efficient.<br />
If PTH is set off, Pactor will never use Huffman compression. When PTH is set<br />
on, Huffman compression will be used if it is more effective. Do not use Huffman<br />
compression with binary file transfers as it only works with 7 bit data.<br />
PTList<br />
Mode: Pactor<br />
Immediate Command<br />
Host: PN<br />
PTList is an immediate command that switches your <strong>PK</strong>-<strong>232</strong> into the Pactor listen<br />
mode.<br />
You can usually monitor a Pactor contact between two connected stations using the<br />
Pactor listen mode. Since your station is not part of the error free link, if<br />
the CRC check does not produce a correct check sum, nothing will be displayed.<br />
If the receiving station requests a repeat, and you have copied the packet, it<br />
will not print twice.<br />
PTOver “n”<br />
Mode: Pactor<br />
Default: ($lA)<br />
Host: PV<br />
“n” — A hexadecimal value from $00 to $7F used to select the change-over<br />
character used in linked Pactor. The default is .<br />
PTOver is the character, conventionally , that is used to change the<br />
direction of data transmission in a linked Pactor operation. When you are<br />
finished transmitting information and you are ready to receive information from<br />
the other station, use the PTOver character. Also see AChg.<br />
2/93 A-65b<br />
From The <strong>N3UJJ</strong>.COM Document Library
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