User manual

57
© 1999 SGC Inc
SGC Inc. SGC Building, 13737 S.E. 26th St. Bellevue, WA. 98005 USA
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CMD Host Value Description
Command OpCode Range
SEL na na enters SELCAL string for ARQ or SELFEC
See the calls. String can be any 4 digits, 4 letters, 5 dig
SAR its, or 9 digits followed by an optional "/" the
command two channel-free letters, followed by an option
al decimal number that defines the gap between
successive channel-free bursts.
If the SELCAL is 4 letters, these form a
CCIR476 call. If the SELCAL is 4 or 5 digits, a
CCIR492 translation to CCIR476 is done. If the
SELCAL is 9 digits, a CCIR625 translation is
performed. If the is no "/" after the SELCAL,
the call is made repeated for 60 sec. If there is a
"/" followed by two letters after the SELCAL,
the call will be preceded by a period in which
the modem listens for the channel-free block
formed by the two letters. If the channel-free
block is not detected before the end of the peri
od, the TNC returns to "dead" with an error
code. If no digits follow the letters, a 15 sec.
period is used, otherwise the period is deter
mined from the decimal number formed from
the digits multiplied by 450ms. For example, a
value of 32 works out as 32 x 450 = 15 sec.
Note: do not use SEL while a link is in
progress.
SFC S4 selcal initiates a SELFEC call. Goes back to "dead"
when terminated. SELFEC calling will be using
CCIR625 protocol when the previous SEL
command set a 9-digit call.
SFE FE na initiates a FEC call. Goes back to "dead" when
terminated.
SFI T1 na flushes the low-level input buffer.
SFO TC na flushes the low-level output buffer.