參數(shù)資料
型號(hào)： SI2400URT-EVB
廠商： Silicon Laboratories Inc
文件頁數(shù)： 22/94頁
文件大小： 0K
描述： BOARD EVAL FOR SI2400 ISOMODEM
標(biāo)準(zhǔn)包裝： 1
系列： ISOmodem®
主要目的： 電信，調(diào)制解調(diào)器
嵌入式： 否
已用 IC / 零件： SI2400
主要屬性： 雙路 RJ-11 連接至電話線路，音頻連接器
次要屬性： RS-232，TTL 串行和 USB 接口
已供物品： 板，調(diào)制解調(diào)器，電源
相關(guān)產(chǎn)品： SI2400-BS-ND - IC ISOMODEM SYSTEM-SIDE 16SOIC
SI2400-FS-ND - IC ISOMODEM SYST-SIDE DAA 16SOIC
336-1093-ND - IC ISOMODEM SYSTEM-SIDE 16SOIC
其它名稱： 336-1166
Si2400
Rev. 1.3
29
6. AT Command Set
The controller provides several vital functions including
AT command parsing, DAA control, connect sequence
control, DCE protocol control, intrusion detection,
parallel phone off-hook detection, escape control, caller
ID control and formatting, PCM mode control, ring
detect, DTMF control, call progress monitoring, and
HDLC framing. The controller also writes to the control
registers
that
configure the modem. Virtually all
interaction between the host and the modem is done via
the controller. The controller uses AT (ATtention)
commands and S-Registers to configure and control the
modem.
The modem has two basic modes of operation, the
Command mode and the Data mode. The Si2400 is
asynchronous in both the Command mode and the Data
mode. The modem is in the Command mode at power-
up, after a reset, before a connection is made, after a
connection is dropped, and during a connection after
successfully “Escaping” from the data mode back to the
command mode using one of the methods previously
described. The following section describes the AT
command set available in the Command mode.
The Si2400 supports a subset of the typical modem AT
command set since it is intended for use with a
dedicated microcontroller instead of general terminal
applications. AT commands begin with the letters AT
and are followed directly (no space) by the command.
(These commands are also case-sensitive.) All AT
commands must be entered in upper case including AT
except w##, r#, m#, q#, and z (wakeup-on-ring).
AT commands can be divided into two groups, control
commands
and
configuration
commands.
Control
commands, such as ATD, cause the modem to perform
an action (going off-hook and dialing). The value of this
type of command is changed at a particular time to
perform a particular action. For example, the command
“ATDT1234<CR>” will cause the modem to go off-hook
and dial the number 1234 via DTMF. This action will
exist only during a connection attempt. No enduring
change in the modem configuration will exist after the
connection or connection attempt has ended.
Configuration
commands
change
modem
characteristics until they are modified or reversed by a
subsequent configuration command or the modem is
reset. Modem configuration status can be determined
with the use of “ATSR?<CR>” Where R is the two
character hexadecimal address of an S-register.
A command line is defined as a string of characters
starting with AT and ending with an end-of-line
character, <CR> (13 decimal). Command lines may
contain several commands, one after the other. If there
are no characters between AT and <CR>, the modem
responds with “O” after the carriage return.
6.1. Command Line Execution
The characters in a command line are executed one at
a time. Unexpected command characters will be
ignored, but unexpected data characters may be
interpreted incorrectly.
After the modem has executed a command line, the
result
code
corresponding
to
the
last
command
executed is returned to the terminal or host. In addition
to the “ATH” and “ATZ” commands, the commands
which warrant a response (e.g., “ATSR?” or “ATI”) must
be the last in the string and followed by a <CR>. All
other commands may be concatenated on a single line.
To echo command line characters, set the Si2400 to
echo mode using the E1 command.
All numeric arguments, including S-register address and
value, are in hexidecimal format and two digits must
always be entered.
6.2. < CR > End Of Line Character
This character is typed to end a command line. The
value of the <CR> character is 13 decimal, the ASCII
carriage return character. When the <CR> character is
entered, the modem executes the commands in the
command line. Commands which do not require a
response are executed immediately and do not
need a <CR>.
Table 17. AT Command Set Summary
Command
Function
A
Answer line immediately with modem.
DT#
Tone dial number.
DP#
Pulse dial number.
E
Local echo on/off.
H
Hangup/go on line.
I
Chip revision.
M
Speaker control options.
O
Return online.
RO
V.23 reverse.
S
Read/write S-Registers.
w##
Write S-Register in binary.
r#
Read S-Register in binary.
m#
Monitor S-Register in binary.
q#
Read S-Register in binary.
Z
Software reset.
z
Wakeup on ring.
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