SI3015-FS Silicon Laboratories Inc, SI3015-FS Datasheet - Page 30

• Manufacturer Part Number: SI3015-FS
• Description: SI2400 ISOMODEM LINE-SIDE
• Manufacturer: Silicon Laboratories Inc

Specifications of SI3015-FS

• Data Format: V.90
• Interface: Serial
• Voltage - Supply: 3.3 V ~ 5 V
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Baud Rates: -

Si2400
AT Command Set Description
A
The “A” command makes the modem go off hook and
respond to an incoming call. This command is to be
executed after the Si2400 has indicated a ring has
occurred. (The Si2400 will indicate an incoming ring by
echoing an “R”.)
This command is aborted if any other character is
transmitted to the Si2400 before the answer process is
completed.
Auto answer mode is entered by setting S00 (NR) to a
non-zero value. NR indicates the number of rings before
answering the line.
Upon
whatever protocol has been determined via the modem
control registers in S07 (MF1).
If no transmit carrier signal is received from the calling
modem within the time specified in S39 (CDT), the
modem hangs up and enters the idle state.
D
The D commands make the modem dial a telephone
call according to the digits and dial modifiers in the dial
string following the command. A maximum of 64 digits is
allowed. A DT command performs tone dialing, and a
DP command performs pulse dialing.
The “ATS07=40DT;” command can be used to go off
hook without detecting dial tone or dialing.
The dial string must contain only the digits “0–9”, “*”, “#”,
“A”, “B”, “C”, “D”, or the modifiers “ ; ”, “ / ”, or “ , ”. Other
characters will be interpreted incorrectly. The modifier
“ , ” causes a two second delay (added to the spacing
value in S04) in dialing. The modifier “ / ” causes a
125 ms delay (added to the spacing value in S04) in
dialing. The modifier “ ; ” returns the device to command
mode after dialing and must be the last character.
If any character is received by the Si2400 between the
ATDT#<CR> (or ATDP#<CR>) command and when the
connection is made (“c” or “d” is echoed), the extra
character is interpreted as an abort, and the Si2400
returns to command mode, ready to accept AT
commands. A line feed character immediately following
the <CR> will be treated as an “extra character” and will
abort the call.
If the modem does not have to dial (i.e., “ATDT<CR>” or
“ATDP<CR>” with no dial string), the Si2400 assumes
the call was manually established and attempts to make
a connection.
30
DT#
DP#
answering, the modem communicates by
Answer
Dial
Tone Dial Number.
Pulse Dial Number.
Rev. 1.1
Automatic Tone/Pulse Dialing
The Si2400 can be set up to try DTMF dialing and
automatically revert to pulse dialing if it determines that
the line is not DTMF-capable. This feature is best
explained by the following example:
If it is desired that the telephone number 12345 be
dialed, it is normally accomplished through either the
ATDT12345 or the ATDP12345 command. In the force
pulse dialing mode of operation, the following string
should be issued instead:
If the result code returned is “t,”, it indicates that the
dialing was accomplished using DTMF dialing. If the
result code returned is “tt,”, it indicates that the dialing
was accomplished using pulse dialing.
In the above example, the Si2400 dials the first digit “1”
using DTMF dialing. The “,” is used to pause in order to
ensure that the central office has had time to accept the
DTMF digit “1”. When the Si2400 processes the “p”
command, it attempts to detect a dial tone. If a dial tone
is detected, the DTMF digit “1” was not effective, hence
the line does not support DTMF dialing. Conversely, if
the dial tone is not detected, the DTMF digit “1” was
effective, and the line does support DTMF dialing. The
character after the “p” may or may not be dialed,
depending on whether the DTMF digit “1” was effective
or not. If the “1” was effective (DTMF mode), the
character after the “p” is skipped. The next DTMF digit
to be dialed is “2”. Subsequent digits are all DTMF. If the
“1” was not effective, the first character after the “p” (the
“1”) is pulse dialed, and subsequent digits are all pulse
dialed.
E
Tells the Si2400 whether or not to echo characters sent
from the terminal.
Does not echo characters sent from the terminal.
Echo characters sent from the terminal.
H
Hang up and go into command mode (go offline).
I
This command causes the modem to echo the chip
revision for the Si2400 device.
0 = Revision A
1 = Revision B
2 = Revision C, etc.
M
These options are used to control AOUT for use with a
EO
E1
Command Mode Echo
Hangup
Chip Identification
Speaker On/Off Options
ATDT1,p12345