import serial
[docs]
class EdwardsAGC:
"""Primitive driver for Edwards Active Gauge Controller.
Complete manual can be found at:
http://www.idealvac.com/files/brochures/Edwards_AGC_D386-52-880_IssueM.pdf
"""
def __init__(self, port='COM1'):
self.serial = serial.Serial(port, baudrate=9600, timeout=0.5)
[docs]
def comm(self, command):
"""Implements basic communication."""
comm = command + "\r\n"
self.serial.write(comm.encode())
complete_string = self.serial.readline().decode().strip()
return complete_string
[docs]
def gauge_type(self, gauge_number):
"""Return the type of gauge."""
types = {
0: 'Not Fitted',
1: '590 CM capacitance manometer',
15: 'Active strain gauge',
5: 'Pirani L low pressure',
20: 'Wide range gauge',
}
type_number = int(self.comm('?GV ' + str(gauge_number)))
gauge_type = types.get(type_number, 'Unknown Type')
return gauge_type
[docs]
def read_pressure(self, gauge_number):
"""Read the pressure of a gauge."""
pressure_string = self.comm('?V ' + str(gauge_number))
pressure_value = float(pressure_string)
return pressure_value
[docs]
def pressure_unit(self, gauge_number):
"""Read the unit of a gauge."""
units = {0: 'mbar', 1: 'torr'}
unit_string = self.comm('?NU ' + str(gauge_number))
unit_number = int(unit_string)
unit = units.get(unit_number, 'Unknown Unit')
return unit
[docs]
def current_error(self):
"""Read the current error code."""
error_code = self.comm('?SY')
return error_code
[docs]
def my_commands(self):
"""Return the software version of the controller."""
return self.comm('?V940')
# Other commands can be added here
if __name__ == '__main__':
E_AGC = EdwardsAGC('COM6')
# Example usage of the methods
print(E_AGC.my_commands())
# print(E_AGC.gauge_type(4))
# print(E_AGC.my_commands())
# print(E_AGC.read_pressure(1))
# print(E_AGC.read_pressure(2))
# print(E_AGC.read_pressure(3))
# print(E_AGC.read_pressure(4))
# print(E_AGC.pressure_unit(1))
# print(E_AGC.current_error())