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<strong>PK</strong>-<strong>232</strong> OPERATING MANUAL<br />
COMMAND SUMMARY<br />
FRIck "n/n”<br />
Mode: Packet<br />
Parameters:<br />
Default: 0/0 (0 sec.)<br />
Host: FF<br />
“n” — 0 to 250, specifying the Frame Acknowledgment timeout for<br />
Meteor Scatter work in 10 milli-second intervals.<br />
FRICK is a short version of FRACK, meant to be used in packet radio meteor<br />
scatter work. If FRICK is 0 (default), the FRACK timer is then in use and the<br />
unit operates as before with the retry timer in units of whole seconds. If FRICK<br />
is 1 to 250, FRICK overrides FRACK as the unit's retry timer, and the retry timer<br />
is in units of 10 msec. up to 2500 mode. (2.5 seconds).<br />
Unlike FRACK, FRICK does not take into account the number of digipeaters in the<br />
connect path. FRICK assumes there are no digipeaters being used.<br />
Note: Do not attempt multiple packet connections while FRICK is active (1-250).<br />
In contrast to FRACK, which provides one retry timer per multi-connect channel,<br />
there is only one FRICK timer in the <strong>PK</strong>-<strong>232</strong>. Each logical channel will try to<br />
use the same FRICK timer, causing interference to the operation of the other<br />
channels.<br />
Due to the sporadic nature of meteor scatter work, a Master/Slave mode can be<br />
enabled in the <strong>PK</strong>-<strong>232</strong> with User BIT 18 (UBIT 18). When UBIT IS OFF, Frame<br />
Acknowledge operation is as in previous firmware versions.<br />
When UBIT 18 is ON, a master/slave relationship is established in packet radio<br />
connections. This is done to reduce the possibility of simultaneous<br />
transmissions by both sides of a packet connection. In this mode, the master<br />
station sends either an I-Frame or a polling frame upon the expiration of FRICK<br />
(or FRACK if FRICK = 0). The FRICK or FRACK timer then starts counting again.<br />
The master station therefore sends packets constantly, even if all its I-frames<br />
have been acknowledged. The slave station sends nothing, not even I-frames,<br />
until it receives a polling frame from the master. A station becomes the master<br />
upon its transmission of a SABM (connect) frame; a station becomes the slave upon<br />
its transmission of a UA (acknowledgement of the SABM) frame.<br />
Recommended settings for this method of meteor scatter work (both stations should<br />
use these settings):<br />
UBIT IS ON<br />
RETRY 0<br />
AX25L2V2 ON (default)<br />
MLXFRAME 1<br />
(CHECK doesn't matter)<br />
FRICK n, where n is large enough to allow the other station time to<br />
send the start of an acknowledgement frame<br />
Note; This is an experimental mode and we welcome any comments or suggestions you<br />
might have. Please make them in writing and direct them to the Timewave<br />
Engineering Department. Thank You.<br />
2/93 A-40a<br />
From The <strong>N3UJJ</strong>.COM Document Library
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