Which way you implement this depends on the capabilities of your computer
communications program and personal preference. The cable between your com-
puter and TNC must also be wired appropriately.
Software Flow Control
Software flow control sends special characters on the TXD and RXD lines of the
RS-232 cable. These are the same lines used for sending regular data between the
TNC and computer. Software flow control normally sends a <Ctrl+S> to stop
data and a <Ctrl+Q> to restart data. When a buffer gets close to full, the device
will send a <Ctrl+S> and expect the other device to stop. When the buffer gets
nearly empty, it will send a <Ctrl+Q> to tell the other device to send more data.
How full or empty a buffer is when the special characters are sent is determined
by the program. But, since the regular data lines are being used, a <Ctrl+S> sent
as data from the keyboard will also stop data from the TNC. And likewise, if
there is a <Ctrl+S> in a file being sent, data flow from the TNC will stop until a
<Ctrl+Q> is received.
XFLOW needs to be turned ON for the TNC to use software flow control. XOFF
determines the character sent by the TNC to stop the flow of data from the com-
puter, and the XON character restarts the flow. The TNC expects the computer to
send the STOP character to stop data to the computer and the START character to
restart data. To use software flow control these commands would be set as fol-
lows: XFLOW ON, XOFF $13, XON $11, STOP $13, START $11. (Default set-
tings.)
Two commands are provided to make it possible to send and/or receive these spe-
cial characters in Transparent Mode and still use software flow control.
TXFLOW enables flow control sent by the TNC to the computer and TRFLOW
enables the TNC to recognize flow control sent by the computer. If both these
commands are ON (and the above commands are set as stated) then software
flow control will take place in both directions, to and from the TNC and com-
puter.
Modes of Operation
Packet Mode of Operation
User’s Guide
118
KPC-9612 Plus v 8.2
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