Escape The Past: Final Touches

This past week I have been completing the code to finalize the project The MTrim RS-422 serial interface needed to be available from within the DF1  RS-232RS-232 interface object since the bits in the PLC that are being read by the DF1 object actually trigger the sending of information across the RS-422 serial interface to the MTrim

The final code for the serial communications can be found at: https://github.com/frellwan/SciFy-Pi.git  in the serial/DF1 folder.

Code to make the MTrim Accessible from within the DF1 class:

class DF1ClientProtocol(SerialClientProtocol):

  def __init__(self, logger, ftpEndpoint, mtrimSerial):
  ''' Initializes our custom protocol

  :param logger: The local file to store results
  :param ftpEndpoint: The endpoint to send results to and read recipes from
  '''
  SerialClientProtocol.__init__(self)
  self.logger = logger
  self.ftpEndpoint = ftpEndpoint
  self.mtrimSerial = mtrimSerial
  self.logFile = logger.getFileName()
  self.ENQCount = 0
  self.lcOEE = LoopingCall(self.startOEEData)
  self.lcAlarms = LoopingCall(self.startAlarmsData)
  self.lcFTP = LoopingCall(self.startFTPTransfer)
  self._reconnecting = False
  self.config = utilities.optionReader()
  fLogFile = logfile.LogFile('df1comms.log', '/home/pi/projects/newSLC/logs', maxRotatedFiles=2)
  fLogObserver = log.FileLogObserver(fLogFile)
  log.startLogging(logfile.LogFile('df1comms.log', '/home/pi/projects/newSLC/logs', maxRotatedFiles=2))
  #log.startLogging(sys.stdout)
  self.notified = False
  self.transferred = False
  self.loaded = False

Then to change parameters when the recipe is changed:

def sendRecipe(recipe):
    PLCRecipe = self.config.getPLCRecipe()

    result = self.mtrimSerial.writeParameter(1, 1, float(recipe[-3]))
    result.addErrback(self.errorHandler, "sendRecipe")

    result = self.mtrimSerial.writeParameter(1, 20, float(recipe[-2]))
    result.addErrback(self.errorHandler, "sendRecipe")

    result = self.mtrimSerial.writeParameter(1, 21, float(recipe[-1]))
    result.addErrback(self.errorHandler, "sendRecipe")

    index = 1                               # Index 0 is recipe name
    var = []
    for address in PLCRecipe:
        request = protectedWriteRequest(1, address, [float(recipe[index])])
        result = self.sendRequest(request)
        result.addErrback(self.errorHandler, "sendRecipe")
        var.append(result)
    d = defer.gatherResults(var)
    d.addCallback(clearRecipeBit)
    d.addErrback(self.errorHandler, 'saving data in StartOEEData failed')

I also need the PiFace code and the serial code to run when the RPi is booted up.

I tried following the istructions found here, but I could not get it to work. I was able to use the basic concept outlined, but had to make changes to the rc.local file in the /etc/init.d directory. When I did that it worked fine.

So to enable the PiFace code and the serial code I created a file - launcher.sh - that looks like this:

#!/bin/sh
# launcher.sh
cd /home/pi/projects
cd /home/pi/projects/PiFace
python3 lcdSM.py &
cd /home/pi/projects/newSLC
python df1.py &

The I used the command:

sudo nano /etc/rc.local

to make the file look like this:

#!/bin/sh

### BEGIN INIT INFO
# Provides: rc.local
# Required-Start: $network $remote_fs $syslog
# Required-Stop: $network $remote_fs $syslog
# Default-Start: 2 3 4 5
# Default-Stop:
# Short-Description: Start df1comms daemon
### END INIT INFO

# Install Script Info
(sleep 10; sudo /home/pi/projects/launcher.sh)&

Everything is working very well. I will put some videos together to show here shortly.