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Communications,
Network Devices and GPS
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Modems
Configuration
For ISS Seismometers the modem is a single plug-in
card.
For Seismic Controller or Multiplexer a modem rack/RS232 patch panel
is used with one receive modem per channel and one common transmit/time-update
modem per rack.
Description
The Seismic Controller is linked to the ISS Seismometers
via asynchronous serial communication lines. The ISS modem and patch
panel racks are adapted to the special needs of time synchronization
and command broadcasting from the Seismic Controller.
- FSK using 4-wire copper lines at 9600, 19200
or 38400 bps
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Technical Specification
(PDF
document)
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- RS232 with optical fibre, leaky feeder or digital
radios can be used with standard equipment supporting RS232
- RS485 with support for multiple ISS Seismometers
on a single pair of copper
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Technical Specification
(PDF
document)
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- Dialup via fixed or mobile telephone (SAQS)
- See also Intelligent Multiplexer datasheets.
Intelligent Multiplexer
Description
The Intelligent Multiplexer (IM) provides a means
for condensing the data from a number of stations in an ISS network
onto one single communication link. This is useful when the number
of communication lines are limited. The unit is equipped with a
modem rack and modems to communicate with the ISS stations.
Characteristics
- Number of ports 8 or 15
- Max data rate/port 38400
- Connection to central computer (115 kb/s max)
- Power supply 110-220 V
Environment
The unit is designed to function in the
harsh environment of underground mining.
Ordering Information
IM/8 Standard version 8 ports
IM/15 Standard version 15 ports
Seismic Controller
The ISS Seismic Controller is a network
device that loads operating code and parameters from a Microsoft
Windows or Linux computer on the Local Area Network (LAN). It continually
acquires, processes, analyses seismic and non-seismic data, storing
the data onto a designated computer on the LAN.
click on image to view enlargement
Technical Specification (PDF
document)
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GPS Timing Unit
Time may be synchronised to Universal Time Coordinance
(UTC) by means of an ISS GPS Timing Unit. This enables recorded
seismic and non-seismic data to be compared with other geotechnical
data that is GPS time-stamped.
click on image to view enlargement
Technical Specification (PDF
document)
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This page last updated: January
2007
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