Kantronics KAM, Instruction Manual

Page: 34 / 55

DUMB MODEM MODE
30
Dumb Modem Mode
KPC-1 , KPC-2 and KPC-2400 Only
The TNC can also be used as a straight-through or dumb modem. In this mode the TNC does not
use any of the protocols or special characteristics of Packet-Radio. Instead, the TNC simply outputs
any information sent through the RS-232/TTL port, at up to 1200 baud.
To utilize the dumb feature, you must PERM the MODEMENA parameter ON. Hold the RTS line of
the RS-232 connector at a negative voltage when the TNC is powered on. If the connector is set to
the TTL level position, the RTS line must be held at a positive 5 volts when the TNC is powered on.
To operate in the dumb modem mode you must utilize the RTS and CTS lines. The TNC will func-
tion as a true RS-232 device, using these lines to control transmit and receive operation. The
transmit and receive LED on the front panel will be operational. This mode uses the PERMed pa-
rameters as specified by the HF, HFT and CCITT command and checks the status of the EQUALIZE
parameter.
To exit this mode, you must turn the TNC off and power up with RTS free.