Ticket1509: First Linkam command must be "T"

[AdrianPotter]

Description of work

The Linkam95 device expects the T command to always come first. Previously a Pa0 was sent initially that would subsequently be ignored. The Linkam95 DB file has been updated to ensure that the T command comes first with 1 subsequent Pa0 afterwards.

Note that I've created a simple device emulator for the Linkam that will help with this ticket:

ISISComputingGroup/EPICS-DeviceEmulator#3

To test

ISISComputingGroup/IBEX#1509

Acceptance criteria

• T command sent first when IOC started
• Pa0 is sent after the first T command
• Subsequent T commands are not followed by a Pa0

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Code Review

• Is the code of an acceptable quality?
• Are the PVs named according to the naming standards.
• Have suitable disable records been added?
• Have suitable simulation records been added?
• Have the finishing touches been applied?
• Is there an emulator for the device?
• Have the changes been documented in the release notes. If so, do they describe the changes appropriately?

Functional Tests

• Do changes function as described? Add comments below that describe the tests performed.
• Does the IOC respond correctly both in full and simulation mode, where it's possible to test both?
• If there are multiple _0n IOCs, do they run correctly?

Final steps

• Reviewer has updated the submodule in the main EPICS repo? See Reviewing work for the subModules of EPICS in the Git workflow page for details.
• Reviewer has moved the release notes entry for this ticket in the "Changes merged into master" section