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參數(shù)資料
| 型號(hào)： | HSCANDXTCSSCODING |
| 英文描述： | CMX866 Operation with Low Level Commands |
| 中文描述： | CMX866操作水平低命令 |
| 文件頁數(shù)： | 2/7頁 |
| 文件大?。?/td> | 74K |
| 代理商： | HSCANDXTCSSCODING |
CMX866 Operation with Low-Level Commands
Page 2 of 7
The following examples are intended to demonstrate how the CMX866 can be made
to perform actions not associated with normal modem call establishment. Please
consult the CMX866 and CMX868 data sheets while reviewing these examples.
2.1 DTMF Generation
After the CMX866 has been successfully powered up, the CMX866 Transmit Mode
register (address $E1) must be written to in order to generate a DTMF tone. This
register is fully described in Section 1.5.10.3 of the CMX868 data sheet.
The AT command
“
AT@Rxx=yy<CR>
”
should be used to write a value to a CMX866
register. The format for this command is:
“
xx
”
is the hexadecimal address of the desired register
“
yy
”
is the decimal equivalent of the desired register contents
“
<CR>
”
is a carriage return
The following AT command demonstrates how the CMX866 can be configured to
transmit a DTMF
“
2
”
character:
AT@RE1=4114<CR>
“
E1
”
is the hexadecimal address for the CMX866 Transmit Mode register, and 4114
d
($1012) represents the contents to be loaded into this register. Mapping the 4114
d
value to the description of the CMX868 Transmit Mode register indicates that the
following actions will occur:
DTMF/Tones generation mode selected (b15-12=0001)
Tx gain of
–
10.5dB (b11-9=000)
DTMF mode selected (b8-5=0000, b4=1)
DTMF character
“
2
”
selected (b3-0=0010)
The DTMF tone can then be observed on either the TXA or the TXAN pins of the
CMX866.
2.2 DTMF Detection
After the CMX866 has been successfully powered up, the CMX866 Receive Mode
register (address $E2) must be written to in order to detect DTMF tones. This
register is fully described in Section 1.5.10.4 of the CMX868 data sheet.
The following AT command demonstrates how the CMX866 can be configured to
detect DTMF tones:
AT@RE2=8185<CR>
“
E2
”
is the hexadecimal address for the CMX866 Receive Mode register, and 8185
d
($1FF9) represents the contents to be loaded into this register. Mapping the 8185
d
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