Protocols

From: "John Scott"

To TAUNO > The seismic head has three separate transducers known as geophones. These > signals are sent to three separate low frequency low noise fixed gain > amplifiers before being presented to the first. second, and third inputs > of the main board, where they are filtered before being presented to the > first,second, and third inputs of the four channel ADC sigma delta chip > the AD7716 > > Ch1 senses vertical motion. > Ch2 sense east-west motion > Ch3 senses north_south motion > > The digital outputs of these three channels are interlaced and sent via > rs232 to a pc. > > The highest frequency of interest is 512Hz. > > The equipment has not yet been designed but it is necessary to look at the > programming capabilities available to work with various possibilities in > the way of hardware. > > Essential main board hardware would include a microprocessor with an > eprom. In an old seismometer this could be a mc68hc705. > In a newer seismometer it could be a 16 bit device. > > The protocols are yet to be laid down. > > The host computer seismic program would comprise of > > Seismometer ini setup file to select the rs232 port, the gain of each > channel, the channel from which the trigger is to be taken from, and the > trigger level: and other factors to be stated later. > > The start sampling signal is from a leyboard designated key, as is also > the stop sampling signal, reset and quit signals. > > The host program contains software to display the velocity and frequency > traces of the seismic wave in terms of vertical, eastwest and northsouth > parameters. It is capable of a great deal of analysis of each of the three > displays. > > THE MICROPROCESSOR CONTROLS THE AD7716 and a suitable program would be > embedded in the eprom. > > Ideas about an appropriate microcontroller are being sought now. The > AD7716 will be used for the sampling. > > Regards John Scott > > >
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John Scott
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