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| 型號： | 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)： | 6/7頁 |
| 文件大?。?/td> | 74K |
| 代理商： | HSCANDXTCSSCODING |
CMX866 Operation with Low-Level Commands
Page 6 of 7
(NOTE: details concerning register writes for programmable tone detection are not
provided due to the large number of writes (27) required for proper register
configuration. The information provided in the
“
PROGRAMMABLE TONE
GENERATION
”
section of this application note, coupled with the information in the
CMX866 & CMX868 data sheets, should be sufficient to allow successful completion
of this operation.)
2.5 Use Of Hook Switch
“
AT
”
Command and the Effect On
Impedance Presented To Telephone Line
The use of the
“
ATHx
”
hook switch command, when used on its own, does not allow
the correct impedance to be presented to the telephone line because the CMX866
transmit amplifiers are not powered up with this command. Therefore, the following
AT command should be used for going off-hook without automatically establishing a
data connection with another modem:
AT@RE0=4864<CR>
“
E0
”
is the hexadecimal address for the CMX866 General Control register, and
4864d ($1300) represents the contents to be loaded into this register. This
command will establish:
b15-13 reserved and set to 0
11.0592MHz crystal operation (b12=1)
No loopback operation (b11=0)
Equalizers enabled (b10=0)
Relay drive pin pulled down to V
ss
(b9=1, this causes the off-hook condition)
Device powered up normally (b8=1)
Normal power operation (b7=0)
IRQ pin disabled (b6=0)
IRQ mask bits are all masked (b5-0=0)
In normal operation where higher level commands are used (e.g. ATDTxyz
…
), the
correct impedance is presented to the telephone line.
3 Conclusion
The CMX866 is an AT-command-driven modem that was designed to easily connect
to off-the-shelf V.22bis-capable modems. Special AT commands are required to
enable the CMX866 to perform functions outside of those associated with normal
modem call establishment. This document presented several examples that
illustrate how the CMX866 can be made to perform these types of functions.
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