Edwards SCU-1600

SCU-1600 Control Unit for Turbomolecular Pump
March 10 92 Issue 1-a
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-1600 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 Bsp 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