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| 型號： | SI2401FS10-EVB |
| 廠商： | Silicon Laboratories Inc |
| 文件頁數(shù)： | 21/76頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL SI2401 UART INTERFACE |
| 標準包裝： | 1 |
| 系列： | ISOmodem® |
| 主要目的： | 電信，調制解調器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | SI2401 |
| 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，調制解調器，電源 |
| 相關產品： | 336-1095-ND - IC ISOMODEM SYSTEM-SIDE 16SOIC |
| 其它名稱： | 336-1167 |
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Si2401
28
Rev. 1.0
send the first SIA block after the “c” is received. Once
the block is transmitted, the modem can monitor for the
acknowledge
tone
by
completing
the
following
sequence:
1. Place the Si2401 in command mode by pulsing the
ESCAPE pin (Si2401 pin 14). The “+++” and “ninth-
bit” escape modes operate in the “!2” mode but are
not recommended because they can send unwanted
characters to the remote modem.
2. Issue the “ATX1” command to turn the modem
transmitter off and begin monitoring for the
acknowledgment tones.
3. Monitor for a positive (negative) acknowledgment “P”
(“N”) after the tone has been detected for at least
400 ms.
4. The modem, still in command mode, can be placed
online as a transmitter by issuing the “ATX2”
command or a receiver by issuing the “ATX3”
command. If tonal acknowledgement is not used, the
host can toggle the ESCAPE pin to place the Si2401
in the command mode and issue an “ATX2” or an
“ATX3” command to reverse data direction.
This sequence can be repeated for long messages.
5.5. Modem Result Codes and Call
Progress
Table 14 shows the modem result codes that can be
used in call progress monitoring. All result codes are a
single character to speed up communication and ease
host processing.
Table 14. Modem Result Codes
Command
Function
a
British Telecom Caller ID Idle Tone
Alert Detected
b
Busy Tone Detected
c
Connect
d
Connect 1200 bps (when pro-
grammed as V.22bis modem)
f
Hookswitch Flash or Battery Reversal
Detected
H
Modem Automatically Hanging Up in
!2, !1
I
Intrusion Completed (parallel phone
back on-hook)
i
Intrusion Detected (parallel phone off-
hook on the line)
K
Kissoff Tone Detected
k
Contact ID Kissoff Tone too long (!1)
L
Phone Line Detected
l
No Phone Line Detected
m
Caller ID Mark Signal Detected
NNo Carrier Detected
n
No Dial tone (time-out set by CW
[S02])
O
Modem OK Response
R
Incoming Ring Signal Detected
r
Ringback Tone Detected
t
Dial Tone
v
Connect 75 bps TX (V.23 originate
only)
x
Overcurrent State Detected After an
Off-Hook Event
^
Kissoff tone detection required
,
Dialing Complete
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