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參數(shù)資料
| 型號： | CH1794ET |
| 英文描述： | MODEM |
| 中文描述： | 調(diào)制解調(diào)器 |
| 文件頁數(shù)： | 4/16頁 |
| 文件大?。?/td> | 1942K |
| 代理商： | CH1794ET |
2000 Cermetek Microelectronics, Inc.
Page 4
Document No. 607-0003 Revision G (05/00)
To maintain FCC compliance, frequencies transmitted while
in voice mode should be between 300Hz and 3000Hz.
When voice and data are both being used, and the RXA and
TXA pins are active, it is typical for voice communication to
precede data communication. In this case, the following
commands should be used to configure the HS Modem to
allow for full utilization of the Voice/Tone injection feature.
These commands disable auto-answer and eliminate hang-
up due to lack of carrier signal.
1.
2.
3.
Enter:
ATS0=0 [CR]
Enter:
ATS7=255 [CR]
Enter:
ATS10=255 [CR]
The following command sequences illustrate implementation
of common voice/tone port applications.
1. To answer a voice call:
(a) Enter:
ATH1 [CR]
(b) Switch local voice source into RXA and TXA
(c) Begin voice conversation.
2.
To switch to data mode, switch local voice source from
RXA and TXA:
(a) At the Originate Modem, enter:
ATX1 [CR]
(b) At the Answer modem, enter:
ATA [CR]
3.
To disconnect (hang-up) a voice call or data call:
(a) Return to control mode by Entering:
+++
(b) Enter:
ATH [CR]
4.
To place a voice call using the HS Modem DTMF
facilities:
(a) Enter:
ATDT(Tele)#;[CR]
(b) Then switch to local voice source
MODEM CONTROL
The HS Modem may be controlled by sending serial ASCII
command sequences. The commands are sent to the modem
serially on the TXD pin. After execution of a received
command, the modem returns a serial status message that
can be read on pin RXD. This message indicates
command completion status. Refer to Tables 5A, 5B and
5C for a complete list of status messages.
MODEM STATES
The HS Modem can be in either command mode or data
mode. When the modem is idle, it is in command mode by
default and will recognize commands. When data
transmission is in progress, the HS Modem is in the data
mode state and will not recognize commands. To force the
HS Modem to recognize commands, the host must send an
“escape sequence” to the HS Modem forcing it out of data
mode and into command mode.
The escape sequence consists of a “guard time” (a period
where no characters are sent to the modem), followed by 3
escape characters, followed by another guard time. At
power-up, the guard time is set to 1 second minimum, and
the escape character is set as “+.” These two parameters
can be modified via registers S2 and S12, respectively.
The HS Modem will stay off-hook with its carrier on after the
escape sequence is received and it returns an OK status
message when it is ready to accept commands. The HS
Modem can be put into data mode by issuing the command
ATO [CR].
THE COMMAND FORMAT
Typical commands consist of three elements:
1.
The attention sequence,
2.
The commands themselves and
3.
A terminating carriage return.
WARNING: The HS Modem family of products has been
FCC Part 68 approved as data/FAX modems. Utilization
of the Voice/Tone Port requires further registration. The
FCC requires that the entire system, including the HS
Modem and the handset or DTMF transceiver, adhere to
Part 68 rules.
Figure 4. HS Modem Family Application Diagram.
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