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Chapter 5 – AT Commands, S-Registers, and Result Codes
Multi-Tech Systems, Inc. SocketModem MT5600SMI Developer’s Guide 58
Command: \B Transmit Break to Remote
Description: In non-error correction mode, the modem will transmit a break signal to the
remote modem with a length in multiples of 100 ms according to parameter
specified. If a number in excess of 9 is entered, 9 is used. The command
works in conjunction with the \K command.
In error correction mode, the modem will signal a break through the active
error correction protocol, giving no indication of the length.
Defined Values: 1-9 Break length in 100 ms units. (Default = 3.)
(Non-error corrected mode only.)
Result Codes: OK if connected in data modem mode.
NO CARRIER if not connected or connected in fax modem mode.
Note: When the modem receives a break from the remote modem, break is
passed to the DTE as follows: In non-error correction mode direct, the
break length is passed; in non-error correction mode normal and in error
correction mode, a 300 ms break is passed.
Command: \K Break Control
Description: Controls the response of the modem to a break received from the DTE or
the remote modem or the \B command. The parameter value, if valid, is
written to S40 bits 3, 4, and 5.
Defined Values: The response is different in three separate states.
The first state is where the modem receives a break from the DTE
when the modem is operating in data transfer mode:
0 Enter on-line command mode, no break sent to the remote modem.
1 Clear data buffers and send break to remote modem.
2 Same as 0.
3 Send break to remote modem immediately.
4 Same as 0.
5 Send break to remote modem in sequence with transmitted data.
(Default.)
The second case is where the modem is in the online Command State
(waiting for AT commands) during a data connection, and the \B is
received in order to send a break to the remote modem:
0 Clear data buffers and send break to remote modem.
1 Clear data buffers and send break to remote modem. (Same as 0.)
2 Send break to remote modem immediately.
3 Send break to remote modem immediately. (Same as 2.)
4 Send break to remote modem in sequence with data.
5 Send break to remote modem in sequence with data. (Same as 4.)
(Default.)
The third case is where a break is received from a remote modem
during a non-error-corrected connection:
0 Clears data buffers and sends break to the DTE.
1 Clears data buffers and sends break to the DTE. (Same as 0.)
2 Send a break immediately to DTE.
3 Send a break immediately to DTE. (Same as 2.)
4 Send a break in sequence with received data to DTE.
5 Send a break in sequence with received data to DTE. (Same as 4.)
(Default.)
Result Codes: OK
Otherwise ERROR