User manual

20
© 1999 SGC Inc
SGC Inc. SGC Building, 13737 S.E. 26th St. Bellevue, WA. 98005 USA
P.O.Box 3526, 98009 Fax: [phone] or 746-7173 Tel: [phone] or 1-800-259 7331
E-mail: [e-mail] Web site: http://www.sgcworld.com
Command Description
SEC sets the "lcflg" to allows or not disable locally-generated echo.
Default = 1
SID sets the TNC’s identification. The ID may be 4 letters, 4 or 5 digits
that would make the unit respond in CCIR476 mode. If the ID is 9
digits it will respond in CCIR625 mode. May be set twice, once with
a CCIR476 and then with a CCIR625 identification. The TNC will
then respond to either call. An optional “/” may follow the ID with
two letters followed by an optional two digits. When the “/” and dig
its are present a channel-free signal will be sent formed by these let
ters. If the letters are followed by the digits, these digits form the
time interval (digits x 450ms) that the modem will remain in standby
before returning to “dead”. If no digits are given, this delay is 15 sec.
If no “/” and letters given the TNC never times out of standby. If the
CW id is set (SCW) and free channel transmission is enabled, a free
signal broadcast will consist of the CW-id followed by eight channel
free blocks. CW-id is omitted when CW-id is null. If a dual ID is set,
only the channel-free data from the last call will be used.
Like for SELCAL, do not change ID on the fly.
SLI initiates ARQ listen mode. The user should enter keyboard mode to
print traffic. Returns to “dead” when SOL or SOT issued.
SIG Enter input gain in +1.5dB steps. Default 4*1.5 = 6dB.
SOA Enter output attenuation in +1.5dB steps. Default 0*1.5 = 0 dB
SOL sets an end-of-link request. This is recognized in ARQ send (SAR),
FEC send (SFE), ARQ listen (SLI), and Test mode (STS). In these
cases, the operation is terminated and the TNC returns to "dead"
mode awaiting new commands. Note; if ARQ is attempted and it has
not yet linked, this command will not affect the termination of the
present mode. Use SED is this case.
SOT sets an end-of-transmission. This causes an ARQ link to finish send
ing any pending traffic en then change to the link receive by sending
the +? group. Note that this command does not merely stuff data into
a buffer, but actually checks and verifies that the link actually
changed over. If needed, it will repeat sending +?. In FEC, this com
mand finishes sending all pending traffic and behaves like SOL.
SOV sets the "ovrflg" that allows the IRS to respond or not to +?
SPO Set Radio Port 1 or 2. Default = 1
SRE sets the "repflg" to allow or disable relinking after timeout.
Default = 1
SRP determines whether or not the receive polarity needs to be normal or
inverted. SRP 0, is for normal polarity, SRP 1 is for inverted polari
ty. Default = 0