In these notes replace [MIDASBASE] with the base of your software installation (default is /MIDAS)

• Server
  The file [MIDASBASE]/TclHttpd/Linux/TclHttpd-server is a shell script which starts tclsh with the script [MIDASBASE]/TclHttpd/bin/httpd-Server.tcl.
  During startup the file [MIDASBASE]/config/TclHttpd/[SystemName]/startup.tcl is searched for where [SystemName] can be the result of the command uname -n; localhost or omitted. This startup script loads the system specific services required.
  The following would load the implementation of the VME Service.
  The VME service consists of two parts. The first part is the hardware access layer. This provides the basic VMEbus read/write functions and is therefore hardware dependent.
  The following would load support for the CAEN USB/PCI VME Bridge (V1718 and V2718). You MUST previously have installed the CAEN provided software support for the bridge (CAENVMELib) which is obtained from CAEN. This is the only supported option if you wish to connect a VME crate directly to a standard Linux/Windows PC or laptop.

  #    Install CAEN USB/PCI VME Bridge plugin
  
      package require CAENVx718
  

  For VME processors (such as the MVME5500) direct access is possible between the processor and the VME backplane.

  #    Install direct VME access plugin
  
      package require VMEAccess
  

  One of these two options is required.
  
  The second part is the generic Service access layer and is independent of the method used to access the VMEbus hardware.

  #    Install VME access service
  
      package require VMEAccessServer
  

  There are a number of configuration options. The following shows examples of these. Replace MYEXPERIMENT by something of your choice.

  #    Install VME access service
  
  namespace eval VMEConfig {
     variable ConfigBase
     set ConfigBase [file join $env(MIDASBASE) config TclHttpd MYEXPERIMENT]
     
     variable ModuleMenu
     set ModuleMenu {CAEN_V1724 CAEN_V785 CAEN_V560 SAC}
  
     variable NumModules
     set NumModules 0
  }
      package require VMEAccessServer
  

• Modules supported
  PatternGen S9418 SAC CAEN_V1720 CAEN_V1724 CAEN_V1740 CAEN_V1742 CAEN_V560 CAEN_V775 CAEN_V785 CAEN_V792 CAEN_V830 CAEN_V1495

• Other Requirements
  The VME service requires the DataBase service for the module settings save/restore facility.
  See here for further information. The following configures the DataBase service for use by the VME service.

  
      upvar #0 VMEAccessServer_DBRootName RootName
      upvar #0 VMEAccessServer_DBNodeBase NodeBase
  
      set RootName EXPERIMENTS/MYEXPERIMENT
      set NodeBase 2011
  
      Setting DataBaseRoot [file join $env(MIDASBASE) DB]
  
      package require DataBaseAccessServer
  
  

• Httpd
  From a Web Browser contact the URL http://[SystemName]:8015. This returns a page containing the WSDL file descriptions of the services available and a menu of available services.
  The URL http://[SystemName]:8015/VME will directly enter the service.
  

V Pucknell; STFC; Daresbury Lab   updated 28 Nov 2011