527 lines
17 KiB
PostScript
527 lines
17 KiB
PostScript
>
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</tr>
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<tr>
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<td align="center">MCP2</th>
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<td align="center">mscb008:(1,43)</th>
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<td align="center">NHQ 204M</th>
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</tr>
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<tr>
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<td align="center">PHVR400_1</th>
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<td align="center">mscb008:(400,1)</th>
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<td align="center">pos. NHV400</th>
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</tr>
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<tr>
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<td align="center">PHVR400_2</th>
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<td align="center">mscb008:(400,5)</th>
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<td align="center"> </th>
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</tr>
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<tr>
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<td align="center">PHVR400_3</th>
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<td align="center">mscb008:(400,9)</th>
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<td align="center"> </th>
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</tr>
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<tr>
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<td align="center">PHVR400_4</th>
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<td align="center">mscb008:(400,13)</th>
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<td align="center"> </th>
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</tr>
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<tr>
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<td align="center">PHVR400_5</th>
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<td align="center">mscb008:(400,17)</th>
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<td align="center"> </th>
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</tr>
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<tr>
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<td align="center">NHVR400_1</th>
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<td align="center">mscb008:(400,21)</th>
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<td align="center">neg. NHV400</th>
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</tr>
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<tr>
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<td align="center">NHVR400_2</th>
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<td align="center">mscb008:(400,25)</th>
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<td align="center"> </th>
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</tr>
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<tr>
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<td align="center">NHVR400_3</th>
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<td align="center">mscb008:(400,29)</th>
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<td align="center"> </th>
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</tr>
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<tr>
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<td align="center">NHVR400_4</th>
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<td align="center">mscb008:(400,33)</th>
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<td align="center"> </th>
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</tr>
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<tr>
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<td align="center">NHVR400_5</th>
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<td align="center">mscb008:(400,37)</th>
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<td align="center"> </th>
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</tr>
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</table>
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\section mscb MIDAS Slowcontrol Bus (MSCB)
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<p>The MSCB is development at PSI (http://www.psi.ch/) driven by Stefan Ritt (stefan.ritt@psi.ch) and Reinhard Schmidt
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(reinhard.schmidt@psi.ch). Their <em>very</em> sparse documentation page is found under http://midas.psi.ch.
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<p>This bus is a kind of "poor man's" version of a field bus with less flexibility, but on the other hand it is optimized
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for experiment environments and much cheaper (typical 20US$ per node). Although this bus is integrated into the MIDAS
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data acquisition system, it can be used independently from Midas.
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<p>The MSCB bus uses the RS-485 standard for commication. This standard is similar to the well-known RS-232, but uses
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differential signals for superior noise immunity. The bus is controlled from a PC using an parallel port to RS-485
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converter. On each bus segment, up to 256 nodes can be connected in parallel. Using one layer of repeaters, 65536
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nodes can be operated on a single bus, which makes the MSCB bus suitable for large experiments typically found in
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high energy physics. The bus protocol uses an addressing scheme to talk to individual nodes. Multi-master operation
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is possible using a token-ring scheme.
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\subsection mscb_device_list MSCB Devices used in the Nemu Experiment
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<p>Here comes the list of the MSCB modules/devices used in the Nemu experiment:
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- \ref scs250
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- \ref scs210
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- \ref scs400
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- \ref scs900
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\subsubsection scs250 MSCB USB submaster
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<p>The scs250 is a USB computer interface to the MSCB bus. The detailed description how to
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get it running under linux is found here http://pc3159:8000/Computing/63. There are two
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versions of the scs250 available:
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- USB powered, i.e. the scs250 <b>and</b> the MSCB bus are than powered via the USB port.
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This is quite limited but nice for testing.
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- MSCB powered. There must be somewhere in the MSCB network a power supply feeding the MSCB bus.
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<b>Do not try to mix them!</b> If there is a power supply feeding the MSCB network (e.g. SCS crate),
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the USB powered scs250 unit needs to be reconfigured (jumper inside the box ... detials to come ...)
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in order to be fed by the bus and <b>NOT</b> by the USB port.
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\subsubsection scs210 MSCB RS232 interface module
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<p>The scs210 is a RS232 interface to the MSCB bus.
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\subsubsection scs400 MSCB Thermo Coupler Card
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<p>8 channel thermo coupler card with digital output to control a power thyristor box.
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\subsubsection scs900 MSCB ADC/DAC card
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<p>8 cannel ADC/DAC card. ADC channels -10 to |