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ARQE Immediate Command<br />
Mode: Command<br />
Host: As<br />
ARQE is an immediate command that switches the <strong>PK</strong>-<strong>232</strong> into the ARQ-E receiving<br />
mode.<br />
ARQ-E is similar to 1-channel TDM, except that the 7-bit code is different.<br />
Like TDM most ARQ-E stations send idle signals for long periods of time. The<br />
<strong>PK</strong>-<strong>232</strong> can only phase on ARQ-E signals that are idling so this is not a problem.<br />
The SIGNAL Identification (SIAM) mode will identify ARQ-E signals for the user.<br />
They are identified as "TDM ARQ-E:4" or 'TDM ARQ-E:S,' referring to 4- and<br />
8character repetition cycles used in this mode.<br />
ARQTmo "n" Default: 60<br />
Mode: AMTOR, Pactor<br />
Host: AO<br />
Parameters:<br />
“n” - 0 to 250 specifies the number of seconds to send an ARQ SELCALL<br />
before automatic transmitter shutdown.<br />
ARQTMO sets the length of time during which your ARQ call will be sent, shutting<br />
down automatically. As a general rule, if you can't activate another AMTOR or<br />
Pactor station in the default time of 60 seconds, you can probably assume that<br />
the other station can't hear your transmission.<br />
ARQTOL “n" Default: 3<br />
Mode: AMTOR ARQ<br />
Host: AO<br />
Parameters:<br />
“n”'<br />
1 to 5, specifying a relative tolerance for bit boundary jitter.<br />
ARQTOL controls the tolerance for received bit boundary jitter in AMTOR ARQ mode.<br />
n is a number from 1 (tight tolerance) to 5 (loose tolerance). The number<br />
signifies how far away from the expected bit transition time the actual received<br />
transition may be, in tenths of a bit (milliseconds). If the transition occurs<br />
further away than expected, the received block is counted as an error, even if<br />
all three characters in the block appear to be valid AMTOR characters. The<br />
default value of ARQTOL 3 is the equivalent of the fixed tolerance of previous<br />
firmware releases.<br />
ARQTOL should be set to a low number (tighter tolerance) for applications that<br />
require nearly error-free communications. The tradeoff is that good received<br />
character blocks are counted as bad if the bit transitions are suspect, thereby<br />
causing retransmissions and lowering the effective character rate.<br />
ARQTOL does not affect FEC, SELFEC or ARQ Listen modes.<br />
2/93 A-15a<br />
From The <strong>N3UJJ</strong>.COM Document Library
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