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