Black Box 3600 User Manual page 111

Note
The Modem 3600 will transmit the XON/XOFF characters to
start/stop data transmission from the remote modem. The
Modem 3600 will not respond to the XON/XOFF characters.
This activity ensures that a false XON/XOFF is not detected
resulting in data loss.
Break Control \Kn
Use \Kn (n = 0-5) to indicate the action taken by the modem when a
break is encountered.
Command Operation
\K Break option 0
\K1 Break option 1
\K2 Break option 2
\K3 Break option 3
\K4 Break option 4
\K5 Break option 5
Conditions under which breaks may occur are explained below with
descriptions of the modem's response under the different \K command
break options.
A break is sent to the serial port while the modem is in connect state
during a reliable or normal connection (no protocol, data buffered).
Command Operation
\K, \K2, \K4 Enter command mode but do not send break to the
remote modem
\K1 Empty the data buffers and send break to the remote
modem
\K3 Immediately send break to the remote modem
\K5 Send break to the remote modem in sequence with any
data received from the serial port
Modem 3600
Protocols
6-9