Multitech MT9234ZBAUSBCDC Guía de usuario descargar pdf (Pagina 18)

Chapter 1 – AT Commands, S-Registers, and Result Codes

Multi-Tech Systems, Inc. AT Commands for the MultiModem & SocketModem MT9234 Series (S000434H) 18

\B Transmit Break

Description: Use this command in non-error-controlled mode. The command causes the modem

to transmit a break signal to the remote modem. The minimum break length is 100

ms and the maximum break length is 900 ms. The <break_time> parameter has

values between one and nine with each increment representing 100 ms. The default

of <value> = 3 corresponds to a length of 300 ms.

The command works in conjunction with the \K command.

Syntax: AT\B<value>

Values: <break_time> = 0–9 in 100 ms units

Default: 3 (300 ms)

Result Codes: OK if <value> = 0, 1.

ERROR if <value> ≠ 0, 1.

\K Break Control

Description: Use this command to control the response of the modem to a break received from

the DTE, remote modem, or the \B<value> command. The command values are

different in three situations:

Syntax: AT\K<value>

Values: \K<value> – Modem Is Operating in Data Transfer Mode

The modem receives a break from the DTE when it is operating in data transfer

mode.

Values Function

0, 2, 4 Enter online command mode, no break sent to remote modem.

1 Clear data buffers and send a break to remote modem.

3 Send a break to the remote modem immediately.

5 Send a nondestructive, nonexpedited break to remote modem.

5 is the default.

\K<value> – Modem Is in Online Command Mode During Data Connection

The modem is in the online command state (waiting for AT commands) during a data

connection, and the \B<value> command is received in order to send a break to the

remote modem.

Values Function

0, 1 Clear data buffers and send break to the remote modem.

2, 3 Send a break to the remote modem immediately.

4, 5 Send a break to the remote modem in sequence with data.

4, 5 are the defaults.

\K<value> – Break Is Received During Connection

The modem receives a break from the remote modem during a connection.

Values Function

0, 1 Clear data buffers and send break to the DTE.

2, 3 Send a break to the DTE immediately.

4, 5 Send a break to the DTE in sequence with the received data.

4, 5 are the defaults.

Result Codes: OK if <value> = 0 to 5.

ERROR if <value> ≠ 0 to 5.

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