Add CSHELL Devices: Scientific Instruments 9620-1, Lake Shore 331, and Varian AGC-100 about mrfreeze HOT 8 OPEN

Also need to teach Mr. Freeze about the Lake Shore 331.

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The Varian is a little tricky because it requires a handshake;

Client: PR1 <CR> [<LF>]
Controller Response: <ACK> <CR> <LF>
Client: <ENQ>
Controller Response:: 0,8.3400E-03 <CR> <LF>
Client: <ENQ>
Controller Response:: 1,8.0000E-04 <CR> <LF>

where the response is of the form

x,sy.yyyyEsyy <CR><LF>

where x == Status, defined as

 0 –> Measurement data okay
 1 –> Underrange
 2 –> Overrange
 3 –> Sensor error
 4 –> Sensor off
 5 –> No sensor
 6 –> Identification error
 7 –> Error FRG-720, FRG-730

and the rest is the actual pressure reading, in exponential notation.

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It's also a little tricky because by default, it'll just start spewing values at you once per second; from the datasheet

When the AGC-100 is put into operation, it starts
transmitting measured values in intervals of 1 s. As soon
as the first character is transferred to the AGC-100, the
automatic transmission of measured values stops. After
the necessary inquiries or parameter modifications have
been made, the transmission of measured values can be
started again with the COM command 

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Seems like the best path forward is to do something like this:

S<CR><LF>
<ETX><CR><LF>
PR1<CR><LF>
[check for an ACK]
<ENQ><CR><LF>
[check the status and parse the actual measurement]

That sends an initial character to stop the COM spew, clear the input buffer with the ETX command, then actually get the measurement with the PR1 command.

from mrfreeze.

LS331 was simple enough, but I've currently got it running on the side for CSHELL. The Varian is still TBD, I've been using the world's shittiest serial <-> USB converters and I can't get one to actually transmit. But I don't think it'll be any more complicated than what I suspected above.

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Fun fact from the future - the cable I was trying to use for the Varian was really an unmarked null modem cable (or it could have been one of the 'custom pinout' APC ones), so it would have never worked. Buzzed the cables and tried to label them appropriately, and picked up a couple of "known good" regular ones so hopefully I won't make that same bonehead mistake in the future.

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Also need to add in the Scientific Instruments 9620-1 that I got going during the last cool down/warm up.

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e.g.

    # Lake Shore 331
    lsport = 4001
    lsterm = "\r\n"
    lsdict = {"TempA": "KRDG? A",
              "TempB": "KRDG? B",
              "Setp1": "SETP? 1",
              "HtrL1": "HTR?",
              "Setp2": "SETP? 2",
              "HtrL2": "AOUT?"}

    # Varian AGC-100 Controller
    vport = 4002
    vterm = "\r\n"
    enq = "\x05"
    vdict = {"Pressure": ["\x03", "PR1", enq]}

    # Scientific Instruments 9620-1
    siport = 4003
    siterm = "\r"
    sidict = {"Temp1": "T",
              "Temp2": "t",
              "Setp": "S",
              "Htr": "H"}

It'd be nice to leave the port settings somewhere easy to find too since they're abstracted away by the MOXA box.

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