POLARIS: IOC and OPI for Mk2 Chopper

[kjwoodsISIS]

As a scientist, I need an IOC and OPI for the Mk2 Chopper, so that I can control the chopper on POLARIS

Acceptance Criteria

1. I can adjust the settings of the POLARIS chopper via a GUI.
2. I can adjust the settings of the POLARIS chopper via a geneie_python script

Notes

1. The Mk2 chopper communicates via a serial port (c.f. the Mk3 chopper which uses an Ethernet port).
2. GEM also uses Mk2 choppers.

[kjwoodsISIS]

@davidkeymer believes it is simply a stream device. It returns a status byte which will need interpretation.

[FreddieAkeroyd]

@GDH-ISIS I think this would be a good ticket for you to do, I will arrange any necessary CSS and Stream device training

[davidkeymer]

ISIS_MK2_Chopper_Computer_Interface.pdf

All commands in manual used in VI, except RA ("Read All") which occasionally causes the communications to hang. Solution is to read the individual values separately. See the VI code for more information.