Edwards SCU-801

SCU-801 Control Unit for Turbomolecular Pump
MT-95E-001-A
Page 98
5
SERIAL COMMUNICATION PROTOCOL
Parameter
Items
Data format
Remark
1
Speed Set Point
(Unit: Hz)
16-bits hexadecimal coded
ASCII
*1
*1 When the parameter value is larger than the rated rotational speed, it is automatically set to the rated rotational speed. When
the parameter value is smaller than half of rated rotational speed, it is automatically set to half of rated rotational speed. The
value of "Speed Set Point" displayed in LCD of SCU-801 is in increments of 500 rpm.
Example:
Speed Set Point
: 01F4
hex
= 500 Hz = 30,000 rpm
Parameter
1
ASCII
0
1
F
4
HEX
30
31
46
34
5.4.13 ReadSpeedSetPoint
Function: Reads the "Speed Set Point" value. This value is the same as "ReadSetPoint" parameter 1
(Speed Set Point).
Transmission frame:
PC->SIM
Stx
0
0
1
?
h
Etx
LRC
SIM->PC
Ack
PC->SIM
Ack
SIM->PC
Stx
0
0
1
Sp
h
Parameter 1
Etx
LRC
Parameter
Item
Data format
Remark
1
Speed Set Point
(Unit: Hz)
16-bits hexadecimal coded
ASCII
Example:
Speed Set Point
: 0320
hex
= 800 Hz = 48,000 rpm
Parameter
1
ASCII
0
3
2
0
HEX
30
33
32
30