Edwards SCU-1600

SCU-1600 Control Unit for Turbomolecular Pump
March 10 99 Issue 1-a
5
SERIAL COMMUNICATION PROTOCOL
*1
This value can be changed in the range from half of the rated rotational speed to the rated rotational speed. 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-1600 is in increments of 500 rpm.
Example:
Second speed setting
: 00E1hex = 225 Hz = 13500 rpm
Second speed option setting : 0000hex = DISABLE
Parameter 1 2 3
ASCII
0 0 1 4 0 0 E 1 0 0 0 0
HEX
30 30 31 34 30 30 45 31 30 30 30 30
5.4.16.2 Second speed selection
The normal rating speed setting or second rating speed setting can be selected in the normal state.
When using this function, set the second speed option to the "ENABLE" (serial port operation). (see
Section 3.11, "Parameter set mode")
Parameter Item Data format Remark
1 Optional function
number
16-bits hexadecimal
coded ASCII
0015 hex
2 Second speed
selection
16-bits hexadecimal
coded ASCII
0000 hex: Normal rating speed setting
0001 hex: Second rating speed setting
0002 hex: [System reservation]
0003 hex: [System reservation]
Others are refused
Example:
Second speed selection : 0000
hex
= Normal rating speed setting
Parameter 1 2
ASCII
0 0 1 5 0 0 0 0
HEX
30 30 31 35 30 30 30 30