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IPN 178800 Rev. B

TM-350/400 Operating Manual

7. Automatic Data Logging of Binary Values (Code #6)

This instruction allows the computer to setup the TM-350/400 to automatically

output selected binary values to the communication port every 100 milliseconds.

The only benefit in this command over command #5 is that the binary values are at

the maximum resolution of the instrument where the string values are not.

The values sent are determined by the bit value of the message byte in the data

logging instruction message. See Table 10-8.

All values are sent in Binary format with the most significant byte first. To convert

this to decimal, use the following formula:

Decimal Value = Sum of Byte[n]*256^(Y-1) where n goes from 1 to Y and Y is the

total number of bytes that make up the value.

For example, say you receive the four following bytes representing the mass per

unit area: 0,10,250,76

This equals (0*256^3 + 10*256^2 + 250*256 + 76)*0.137 ng/cm^2 = 98,562.7

ng/cm^2

The rate and thickness values are in the normal units of Ang and Ang/sec. Sensor

period however, is in special units. Use the following formula to convert period to

frequency.

Frequency (Hz) = (3.221E15)/Period

Table 10-8 Automatic Data Logging of Binary Values

Byte # Bit # Description Length

(bytes)

Format Units

1 0 Active Sensor Rate 3 Binary Å/sec

1 Active Sensor Thickness 3 Binary Å

2 Active Sensor Period 4 Binary ***

3 Sensor #1 Rate 3 Binary Å/sec

4 Sensor #1 Thickness 3 Binary Å

5 Sensor #1 Period 4 Binary ***

6 Sensor #2 Rate 3 Binary Å/sec

7 Sensor #2 Thickness 3 Binary Å

2 0 Sensor #2 Period 4 Binary ***

1 Active Sensor # 1 String None

2 Sensor #1 Mass per unit area 4 Binary 0.137 ng/cm^2

3 Sensor #2 Mass per unit area 4 Binary 0.137 ng/cm^2

1 2 ... 70 71 72 73 74 75 76 77 78 79 80 81 82

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Inficon TM-400 Thin Film Deposition Monitor Bedienungsanleitung Seite 75