INFICON Guardian EIES Controller User Manual

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Guardian Co-Deposition Controller Operating Manual

7.3.4.4 C

Description: Sets the bias current into the PMT module A to D converter. This
command is used to calibrate the PMT module. To calibrate, set a 100nA bias
current and take readings from the PMT module (G command). Next set a 2000nA
bias current and take readings. For normal operation, be sure to leave the current
at 2000nA. Calculate the slope and intercept of the y=mx + b transfer function,
where y is counts and x is current, as shown below. These values will be used to
convert counts to current in the G command (below).

Slope(PMT1) = (2000nA - 100nA) / ((Reading(2000nA) - Reading(100nA))

Intercept(PMT1) = 2000nA - (Slope(PMT1) * Reading(2000nA))

Parameters: PMT#, Current in nA

Example: C2,100 sets the second PMT module bias current to 100nA

Returns: C

7.3.4.5 D

Description: Get sensor readings. Readings are returned as a comma delimited
string of all measurements for all sensors, in A/D counts. The final value is a sensor
status, which is no longer used (always zero). The format of the returned string is:

EimissionCurrent1,LeakageCurrent1,Power1,FilamentCurrent1,BiasVoltage1,
EimissionCurrent2,LeakageCurrent2,Power2,FilamentCurrent2,BiasVoltage2,
EimissionGas1,LeakageGas1,PowerGas1,FilCurrentGas1,BiasVoltageGas1,
EimissionGas2,LeakageGas2,PowerGas2,FilCurrentGas2,BiasVoltageGas2,

SensorStatus

Parameters: None

Example: D

Returns:D;78568,4932,85744,640773,4575,96472,2075,699535,638957,4637,0,
0,92533,641379,4588,0,0,699515,639978,4645,0

7.3.4.6 F

Description: Queries the controller if any PMT module has a new reading available.
A response of 1 indicates a new reading is available, zero indicates no new reading
available? When a new reading is ready, send a G command (see below) to get
the reading(s).

Parameters: None

Example: F

Returns: F1 or F0