i-modul Modem 144/56k
Functions
6.1.2
Phone connection
The automatic negotiation of the baud rate and the modulation standard enables
the i-modul Modem 144/56k 3.0 basic to negotiate the largest possible connection
speed to the remote terminal while the connection is established. The speed
depends on the settings and the abilities of the modem at the remote terminal. Via
the modulation standard, the connection speed can be set through the phone line.
If nothing is defined, the i-modul Modem 144/56k 3.0 basic will automatically try to
determine the optimum connection parameters.
The function is active as default.
Configuration with AT commands
To configure the modulation standard and
thus the connection speed, use the
command:
AT+MS=<modulation>
Please find the possible parameters for this command in the Chapter "AT
Command reference".
To display the current settings:
AT+MS?
For a list of possible parameter of the
command, enter:
AT+MS=?
6.2
Data Buffer for Serial Data Transmission
The i-modul Modem 144/56k 3.0 basic provides send and receive buffers. These
buffers prevent the loss of data, in case the application or the remote terminal can
not receive data at this time. The data buffer can be deactivated together with the
error correction (bit direct mode). When the buffer is activated, the data flow
control should be active to avoid a buffer overflow in the i-modul Modem 144/56k
3.0 basic. If the buffer overflows, the data gets lost. Operation without a buffer and
error correction is only useful for special character framings
.
The function is active as default.
Configuration with AT commands
To deactivate the error correction as well as
the buffer in the i-modul Modem 144/56k
3.0 basic for applications with special data
format, use the command:
AT\N1
To deactivate only the error correction, use
the command:
AT\N0
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