Perhaps I know why the QNX can not drive a WINMODEM.
A QNX application ( or process) which will use the modem just controls the
modem by the group of AT commands,no matter what the modem looks like and
who made it.the application pass the AT commands (or messages) to the
process of devc-8250.The process of devc-8250 is just a process whose duty
is to communicate with a serial port,and it does not care the content will
be transfered.Fortunately,all the real modems have the capability of AT
commands,so it works,that’s why you can not find any driver for any modem in
QNX.But not for a WINMODEM which can not understand the AT Commands,the
driver of it have a translation for it.Without a driver ,you can not use a
winmodem in QNX.
I am a newbie ,that’s just guessing,so,is what I said right?
ChaoLi <qnx_basic@sohu.com> wrote:
QNX.But not for a WINMODEM which can not understand the AT Commands,the
driver of it have a translation for it.Without a driver ,you can not use a
winmodem in QNX.
I am a newbie ,that’s just guessing,so,is what I said right?
Not quite, the problem with WinModem’s or Softmodems is that they require
a host computer to do the DSP (Digital Signal Processing) instead of
the modem itself. There are different types of software controlled
modems, some just lack some DSP ability in hardware, others are
completely controllerless and are braindead without an almost complete
software emulation of all the missing hardware.
The fact the a Winmodem doesn’t respond to Hayes type AT commands
without a driver isn’t really the problem - it’s the lack of driver.
-Adam
“Operating System for Tech Supp” <os@qnx.com> wrote in message
news:9o7qct$fnv$4@nntp.qnx.com…
ChaoLi <> qnx_basic@sohu.com> > wrote:
QNX.But not for a WINMODEM which can not understand the AT Commands,the
driver of it have a translation for it.Without a driver ,you can not use
a
winmodem in QNX.
I am a newbie ,that’s just guessing,so,is what I said right?Not quite, the problem with WinModem’s or Softmodems is that they require
a host computer to do the DSP (Digital Signal Processing) instead of
the modem itself. There are different types of software controlled
modems, some just lack some DSP ability in hardware, others are
completely controllerless and are braindead without an almost complete
software emulation of all the missing hardware.The fact the a Winmodem doesn’t respond to Hayes type AT commands
without a driver isn’t really the problem - it’s the lack of driver.-Adam
Yes,you are right,the softmodems(the more exact name for it^-^)only have
the modulating hardware which is needed to interface the telphone
line,isn’t it?you shall have a hardware DSP or software one in a modem.
“Operating System for Tech Supp” <os@qnx.com> wrote in message
news:9o7qct$fnv$4@nntp.qnx.com…
ChaoLi <> qnx_basic@sohu.com> > wrote:
QNX.But not for a WINMODEM which can not understand the AT Commands,the
driver of it have a translation for it.Without a driver ,you can not use
a
winmodem in QNX.
I am a newbie ,that’s just guessing,so,is what I said right?Not quite, the problem with WinModem’s or Softmodems is that they require
a host computer to do the DSP (Digital Signal Processing) instead of
the modem itself. There are different types of software controlled
modems, some just lack some DSP ability in hardware, others are
completely controllerless and are braindead without an almost complete
software emulation of all the missing hardware.The fact the a Winmodem doesn’t respond to Hayes type AT commands
without a driver isn’t really the problem - it’s the lack of driver.
In a Winmodem it’s not the modem that responds to the AT
command set it’s the driver that comes with it that does.
-Adam