Tadpole SPARCbook 3 series, Reference Manual

Page: 123 / 216

MODEM
9-5
AT Command Set
9.3.3 Line Status Register
The Line Status register contains information which allows the condition of
the transmit and receive buffers to be monitored.
Bit 7 Reserved
Bit 6 Transmitter Empty
This bit when set indicates that both the transmit buffer
and the transmit shift register are empty
Bit 5 Transmitter Buffer Empty
This bit when set indicates that the transmit holding
register is empty. It is cleared automatically when the
host writes data into the transmit holding register
Bit 4 Break Interrupt Flag
Bit 3 Framing Error Flag
Bit 2 Parity Error
Bit 1 Overrun Error
Bit 0 Receiver Data Ready
9.4 AT Command Set
Normally, a user interacts with the modem through Mail Tool or FAXtool
in the OpenWindows environment, or with Unix commands from the
Solaris command line. It is also possible to interact with the modem directly
using the Hayes compatible AT command set. This section describes some
of the more commonly used commands in AT command set supported by
SPARCbook modem, as summarized in Table 9-2.
To respond to AT commands, the modem must be placed in Command
Mode. This can be done from the Solaris command line using the
cu
command:
%
cu modem
When in Command Mode, the modem accepts instructions in the form of
command lines and in many instances returns responses. The modem can
be instructed to perform functions such as originating or answering calls, or
can be configured to change its mode of operation. The SPARCbook
modem is provided with an EEPROM which allows two configuration
profiles and four telephone numbers to be retained.
S3GX_TRMBook Page 5 Friday, September 19, 1997 11:39 am