COMMANDS
10
CD Internal | External | Software V 3.0
default INTERNAL All units Packet
When set to INTERNAL, the TNC will detect a signal present on the frequency based on the meth-
od used by the attached modem. This is normally an energy type carrier detect, allowing shared
voice and data on the same channel.
When set to EXTERNAL, the carrier detect is supplied by an external device, connected to the XCD
pin on the radio port.
If set to SOFTWARE, the firmware inside the TNC will detect the presence of data to enable the
carrier detection, allowing operation with un-squelched audio. Correct operation of SOFTWARE de-
tect is affected by proper equalization and the SWP parameter. If your RVC light flickers, this is an
indication that you may need to adjust the equalization. On the KPC-2, KPC-2400 and KPC-1 this is
a software command (EQUALIZE). The KAM and KPC-4 have internal jumpers to set the equaliza-
tion (see Calibration/Equalization section of the Installation Manual).
When operating RTTY and ASCII, the KAM will use only INTERNAL or EXTERNAL. If this command
is set to SOFTWARE, the KAM will act as though it were set to INTERNAL when in RTTY and ASCII
modes.
KPC-2400
Another option is available for the KPC-2400, namely 2400. When set to 2400, the KPC-2400 will
use the carrier detect circuit of the 2400 b/s modem, even when other speeds are selected by the
HBAUD command. During 2400 b/s operation, the CD setting is ignored and the 2400 b/s carrier
detect is utilized.
See also: swp
CHeck n (n = 0 – 255)
default 0
KPC-1/KPC-2/KPC-2400
Packet
default 0/0
KAM/KPC-4
Packet
Each increment of CHECK is 10 seconds. If n is greater than 0, then a periodic check (poll) will be
made to determine that a connected state still exists when no activity has occurred for n × 10 sec-
onds. This prevents "hang-up" in a connected mode when a link failure occurs as a result of condi-
tions beyond control of the connected stations. If n equals 0 then this timeout function is disabled.
If using version 1 (AX25L2V2 OFF), a check timeout will initiate a disconnect.
See also: ax25l2v2, kntimer, relink, rnrtime
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