Starrett SR200 Surface Roughness Tester - Manual (Page 25)

SR200 Specifications subject to change 5.5
Specification for Data Dump
The following format is used for data dump from SR200 to a PC.
Transmission set up is as follows:
Baud rate: 9600 Baud
Number of data bits 8
Start bit: 1
Stop bit: 1
Parity: None
Resolution Horizontal Vertical
0.5µm for Evaluation 10nm
Length 8mm
1.0µm for Evaluation
Length >8mm
Evaluation length selectable
0.25mm, 0.8mm, 1.25mm,
2.5mm, 4.00mm, 8.0mm,
12.5mm. 25.0mm
Range selectable 10µm, 100µm, 300µm
Transmission RS232
Transmitted data is unfiltered No parameters are calculated
Transmission data
Data type Function Comments
2 bytes Number of data values
Total number of
transmitted data values
1 byte Ordinate spacing
Number of data values
per mm
1 byte First data value Resolution 10nm
1 byte Diff data value
Difference between this
and the previous data
value
#80 Stop byte 2 stop bytes are sent
#80 Stop byte
Making it possible to test
for all data values received
The total number of transmitted data bytes are, number of data values +5
The data value can be calculated from, data value (n) = date value (n-1) + diff data value
(n), n1.