Ornl Serial Software: A User

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Ornl Serial SoftwareA Users View

• Ray Juras, ornl
• November 14, 2000

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Topics

• Motivation
• What was done
• Details of device-specific module creation
• Summary

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Motivation

• The HRIBF control system is being moved from
  Vsystem to EPICS. All serial device interfaces
  must be migrated.
• We chose to use VxWorks/x86 with SBS serial
  IndustryPacks (existing system used VME, but PCs
  are less expensive allowing deployment nearer
  controlled equipment). Appropriate VxWorks
  driver was needed.
• One serial device (Omega cn76000) requires
  checksum generation. We did not see how to
  implement this using devAscii. New serial device
  support, ornlSerial, was created.
• Other serial devices also require special
  treatment. Some require inter-character and
  inter-command delays.

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Support Software

• John Sinclair developed the following
• VxWorks driver for x86/PCI SBS IndustryPack.
• Serial driver support.
• Device-independent serial device support.
• Device manager to configure devices (baud, etc.)
  at start time.
• Each serial device requires a device-dependent
  module

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Database Fields

• The database fields related to ornlSerial are as
  shown below

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Associated Device Manager Unit Number Definitions
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Module Functions

• Each device-specific module must provide the
  following functions
• init Called once per manf/model
• create Called once per pv
• encodeVal Called before a write operation
• decodeRsp Called after a write operation
• encodeCmd Called before a read operation
• decodeVal Called after a read operation

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Module Functions

• For a particular pv, code only needs to be added
  to a subset of functions. Often, only create
  definitions are needed.
• For example, a pv to turn a power supply on may
  only need code in create to define the ascii
  send string (including termination).
• A pv to read current from a power supply may only
  require code in create to define the command
  and code in decodeVal to decode the returned
  value.

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Aids Make Debugging Serial Modules Easy
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Serial Devices Interfaced

• Omega CN76000 temperature controller.
• Varian Multigauge vacuum controller.
• Granville-Phillips GP307 vacuum controller
• Danfysik models 8000 and 8800 power supplies.
• Group3 Digital Teslameters (Hall Probes).
• Metrolab PT2025 NMR.

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Summary

• VxWorks/x86/PCI driver developed for IndustryPack
  I/O.
• Ornl serial device support developed
• Useful for cases when devAscii is not flexible
  enough (for example, checksums required).
• But, requires (simple) programming of
  device-specific modules.
• Device Manager for configuration (Baud, parity,
  etc).