216, Astronomical Data Analysis Software and Systems IX, eds. This data is obtained from a shared memory board that the MCP updates at rates up to 200Hz. In the original version of the TPM, the only function was to write the an interface to the primary and secondary mirror support systems into a series of files on a NFS-mounted workstation disk. There were no graphical tools to examine either real-time or archived TPM information.
Channel access maintains a global name space of process variables within the local Internet sub-net.
These process variables can be connected to a variety of data sources including a real-time database running on the vxWorks operating system. Two separate and independent extensions have been created to access SDSS TPM data. The second solution involved the construction of a data source module for the XARR data archive viewer so it can read the TPM log files that are written on the workstation disk. These are used with symbolic device support to make the vxWorks global symbols visible via channel access. The TPM status records can be enhanced by defining upper and lower operating ranges and alarm limits and by creating a special device support layer instead of reliance on global vxWorks symbols.