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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,183 @@ | ||
| import random | ||
| import socket | ||
| import struct | ||
|
|
||
| STX = '\x02' | ||
| ADDR = '\x10' | ||
| CMD = '\x80' | ||
| CR = '\x0D' | ||
| DATA_WRITE = '\x61' | ||
| DATA_READ = '\x63' | ||
| ESC = '\x07' | ||
| ESC_STX = '\x30' | ||
| ESC_CR = '\x31' | ||
| ESC_ESC = '\x32' | ||
|
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||
|
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| class PTC: | ||
| def __init__(self, ip_address, port=502, timeout=10, fake_errors=False): | ||
| self.ip_address = ip_address | ||
| self.port = int(port) | ||
| self.fake_errors = fake_errors | ||
|
|
||
| self.model = None | ||
| self.serial = None | ||
| self.software_revision = None | ||
|
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||
| self.comm = socket.socket(socket.AF_INET, socket.SOCK_STREAM) | ||
| self.comm.connect((self.ip_address, self.port)) # connects to the PTC | ||
| self.comm.settimeout(timeout) | ||
|
|
||
| def get_data(self): | ||
| """ | ||
| Gets the raw data from the ptc and returns it in a usable format. | ||
| """ | ||
| self.comm.sendall(self.buildRegistersQuery()) | ||
| data = self.comm.recv(1024) | ||
| data_flag, brd = self.breakdownReplyData(data) | ||
|
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| return data_flag, brd | ||
|
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| @staticmethod | ||
| def buildRegistersQuery(): | ||
| query = bytes([0x09, 0x99, # Message ID | ||
| 0x00, 0x00, # Unused | ||
| 0x00, 0x06, # Message size in bytes | ||
| 0x01, # Slave Address | ||
| 0x04, # Function Code | ||
| 0x00, 0x01, # The starting Register Number | ||
| 0x00, 0x35]) # How many to read | ||
| return query | ||
|
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||
| def power(self, state): | ||
| """Turn the PTC on or off. | ||
| Parameters | ||
| ---------- | ||
| state : str | ||
| Desired power state of the PTC, either 'on', or 'off'. | ||
| """ | ||
| command = [0x09, 0x99, # Message ID | ||
| 0x00, 0x00, # Unused | ||
| 0x00, 0x06, # Message size in bytes | ||
| 0x01, # Slave Address | ||
| 0x06, # Function Code | ||
| 0x00, 0x01] # Register Number | ||
|
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||
| if state.lower() == 'on': | ||
| command.extend([0x00, 0x01]) | ||
| elif state.lower() == 'off': | ||
| command.extend([0x00, 0xff]) | ||
| else: | ||
| raise ValueError(f"Invalid state: {state}") | ||
|
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||
| self.comm.sendall(bytes(command)) | ||
| self.comm.recv(1024) # Discard the echoed command | ||
|
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||
| def breakdownReplyData(self, rawdata): | ||
| """Take in raw ptc data, and return a dictionary. | ||
| The dictionary keys are the data labels, the dictionary values are the | ||
| data in floats or ints. | ||
| Returns | ||
| ------- | ||
| data_flag : bool | ||
| False if data is valid, True if output could not be interpretted. | ||
| data : dict | ||
| Data dictionary already formatted for passing to OCS Feed. | ||
| """ | ||
|
|
||
| # Associations between keys and their location in rawData | ||
| keyloc = {"Operating_State": [9, 10], | ||
| "Compressor_State": [11, 12], | ||
| "Warning_State": [15, 16, 13, 14], | ||
| "Alarm_State": [19, 20, 17, 18], | ||
| "Coolant_In_Temp": [23, 24, 21, 22], | ||
| "Coolant_Out_Temp": [27, 28, 25, 26], | ||
| "Oil_Temp": [31, 32, 29, 30], | ||
| "Helium_Temp": [35, 36, 33, 34], | ||
| "Low_Pressure": [39, 40, 37, 38], | ||
| "Low_Pressure_Average": [43, 44, 41, 42], | ||
| "High_Pressure": [47, 48, 45, 46], | ||
| "High_Pressure_Average": [51, 52, 49, 50], | ||
| "Delta_Pressure_Average": [55, 56, 53, 54], | ||
| "Motor_Current": [59, 60, 57, 58], | ||
| "Hours_of_Operation": [63, 64, 61, 62], | ||
| "Pressure_Unit": [65, 66], | ||
| "Temperature_Unit": [67, 68], | ||
| "Serial_Number": [69, 70], | ||
| "Model": [71, 72], | ||
| "Software_Revision": [73, 74]} | ||
|
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||
| # Iterate through all keys and return the data in a usable format. | ||
| # If there is an error in the string format, print the | ||
| # error to logs, return an empty dictionary, and flag the data as bad | ||
| data = {} | ||
|
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||
| # If fake_errors=True, then randomly output the string 'FAKE ERROR' | ||
| # instead of the actual data 50% of the time | ||
| if self.fake_errors: | ||
| if random.random() < 0.5: | ||
| rawdata = "FAKE ERROR" | ||
|
|
||
| try: | ||
| for key in keyloc.keys(): | ||
| locs = keyloc[key] | ||
| wkrBytes = bytes([rawdata[loc] for loc in locs]) | ||
|
|
||
| # four different data formats to unpack | ||
| # Big endian unsigned integer 16 bits | ||
| if key in [ | ||
| "Operating_State", | ||
| "Compressor_State", | ||
| "Pressure_Unit", | ||
| "Temperature_Unit", | ||
| "Serial_Number", | ||
| ]: | ||
| state = struct.unpack(">H", wkrBytes)[0] | ||
| # Serial number is an attribute, not publishable data | ||
| if key == "Serial_Number": | ||
| self.serial = state | ||
| else: | ||
| data[key] = state | ||
| # 32bit signed integer which is actually stored as a | ||
| # 32bit IEEE float (silly) | ||
| elif key in ["Warning_State", "Alarm_State"]: | ||
| state = int(struct.unpack(">f", wkrBytes)[0]) | ||
| data[key] = state | ||
| # 2 x 8-bit lookup tables. | ||
| elif key in ["Model"]: | ||
| model_major = struct.unpack( | ||
| ">B", bytes([rawdata[locs[0]]]))[0] | ||
| model_minor = struct.unpack( | ||
| ">B", bytes([rawdata[locs[1]]]))[0] | ||
| # Model is an attribute, not publishable data | ||
| self.model = str(model_major) + "_" + str(model_minor) | ||
| elif key in ["Software_Revision"]: | ||
| version_major = struct.unpack( | ||
| ">B", bytes([rawdata[locs[0]]]))[0] | ||
| version_minor = struct.unpack( | ||
| ">B", bytes([rawdata[locs[1]]]))[0] | ||
| self.software_revision = str(version_major) + "." + str(version_minor) | ||
| # 32 bit Big endian IEEE floating point | ||
| else: | ||
| data[key] = struct.unpack(">f", wkrBytes)[0] | ||
|
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| data_flag = False | ||
|
|
||
| except BaseException: | ||
| data_flag = True | ||
| print("Compressor output could not be converted to numbers." | ||
| f"Skipping this data block. Bad output string is {rawdata}") | ||
|
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| return data_flag, data | ||
|
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||
| def __del__(self): | ||
| """ | ||
| If the PTC class instance is destroyed, close the connection to the | ||
| ptc. | ||
| """ | ||
| self.comm.close() |