參數(shù)資料
型號(hào)： SI2400-FS
廠商： Silicon Laboratories Inc
文件頁(yè)數(shù)： 30/94頁(yè)
文件大?。?/td> 0K
描述： IC ISOMODEM SYST-SIDE DAA 16SOIC
標(biāo)準(zhǔn)包裝： 48
系列： ISOmodem®
數(shù)據(jù)格式： V.21，V.22，V.23，Bell 103，Bell 212A
波特率： 2.4k
電源電壓： 3 V ~ 5.25 V
安裝類型： 表面貼裝
封裝/外殼： 16-SOIC（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 16-SOIC N
包裝： 管件
配用： 336-1166-ND - BOARD EVAL FOR SI2400 ISOMODEM
Si2400
36
Rev. 1.3
6.5.7. Intermessage Timing
Intermessage timing is accomplished in three ways,
relative to the end of the previous message (“,” result
code), relative to the Kissoff Tone (“K” result code) or
relative to the Kissoff timeout (“^” result code).
If the intermessage timing is relative to the end of the
previous message (S36[3:2] [IDKT] = 10b or 11b), the
intermessage timer begins with the “,” result code. The
Si2400 sends an “N” to mark the time in which the
intermessage timer has timed out. If another message
is received prior to the “N”, the Si2400 keeps the
message and sends it to the receiver at the time the “N”
is sent.
If a message is not received within the time frame
defined by “,” and “N”, the Si2400 sends nothing, waits
for the next message and transmits the message as
soon as the host sends the message. This message
may not be accepted by the alarm receiver.
If the intermessage timing is relative to the end of the
Kissoff Tone, the timing begins when the “K” result code
is sent. In the event a kissoff tone was not detected, the
intermessage timing begins when the “^” is sent.
6.5.8. Returning to Command Mode
To return to command mode, the host sends any
character except the “~” and “!” characters. The
example here uses a <CR> to escape.
Once in command mode, all of the AT commands are
available.
ATH<CR>
Is used to hang up the line. Note that it is
the responsibility of the host to hang up the
line.
!7xxx<CR> Sends the message xxx without dialing.
The message is sent as soon as the
Si2400 receives the <CR>. After this
message, it is again possible to send
subsequent messages using the “~” and “!”
commands shown above.
X1
Search for positive and negative acknowledge tones in
SIA half-duplex 300 bps mode. The Si2400 will respond
with “P” when a positive acknowledge is detected and
“N” when a negative acknowledge is detected.
X2
Return to online mode in SIA half-duplex mode as
transmitter.
X3
Return to online mode in SIA half-duplex mode as
receiver.
Figure 12. !7 Security Timing
S39 (CDT)
Before give up on
handshake
f = S38[1:0] (HF)
min.
2nd M essage
S36[1:0] (IT) = 0Xb
Interdigit
S36[1:0] (IT) = 1Xb
Interdigit
Handshake
Tone
Kissoff
Tone
S36[3:2] (IDKT)
Before Indicating lack
of Kissoff
1st
Digit
Last
Digit
1st
Digit
Last
Digit
S36[3:2] (IDKT) =
1Xb
Interm essage from end of previous
m essage to start of next m essage
Intradigit Tim ing
Pulse O n = S36[5:4] (PON)
Pulse O ff = S36[7:6] (POF)
Pulse freq = S38[6:5] (DCF)
S36[3:2] (IDKT) = 0Xb Interm essage
From end of Kissoff Tone
S38[7] (DBD)
S38[4:2] (HMT)
f = S38[6:5] (DCF)
S38[4:2] (HMT)
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