Modes of Operation
This chapter covers the major ways in which you may use your Kantronics TNC.
For details on particular commands, see the “Command Reference” chapter.
Most Kantronics TNCs are designed with one or two radio ports. The KPC-9612
Plus is unique in that two sets of “railroad” header pins are included on its main
printed circuit board to allow for an optional third device, such as an additional
modem. This open-ended design allows one to add new modems without affect-
ing the operation of port 1 (a low speed port @ 1200 baud) or port 2 (a high speed
port, supporting from 4,800 to 38,400 baud). The KPC-9612 Plus supports the
modes outlines in this chapter. If new modes are added with a third device, new
firmware and a manual addendum covering those modes will be shipped with the
add-on device.
Packet Mode of Operation
This section adds to the information presented in the introductory chapter on how
packet radio uses digital information for communication. By familiarizing your-
self with the concepts presented here, you’ll be aware of and, if you wish, able to
change the default value(s) of the command parameters in your TNC to optimize
your packet activities.
Introduction
Information is Organized into “Packets”
A packet is a group of characters with a flag and header at the beginning and a
checksum and flag at the end. A flag is a specific character used to signify the be-
ginning and ending of a packet. The header is information indicating who the
packet is from, who it is to, any relay stations needed to get to the destination and
some control information. A checksum is a complicated mathematical formula
that produces a number based on the combination of characters that are in the
packet. This number is recalculated by every station that receives the packet and
if it does not match the number that is in the packet, the packet is thrown away,
thus near error-free communications. A packet is also called a frame.
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