SCU-1600 Control Unit for Turbomolecular Pump
March 10 80 Issue 1-a
5
SERIAL COMMUNICATION PROTOCOL
5.4.2 ReadMeas
Function: Reads the measured rotational speed.
Transmission frame:
PC->SIM Stx 0 0 1 ? D Etx LRC
SIM->PC Ack
PC->SIM Ack
SIM->PC Stx 0 0 1 Bsp D Parameter 1 to 2 Etx LRC
Parameter Item Data format Remarks
1
[System reservation] 56-bits hexadecimal
coded ASCII
2
Measured rotational speed
(Unit: Hz)
16-bits hexadecimal
coded ASCII
Example:
Measured rotational speed: 02DC
hex
= 732 Hz = 43,920 rpm
Parameter 1 2
ASCII
*1 *1 *1 *1 *1 *1 *1 *1 *1 *1 *1 *1 *1 *1
0 2 D C
HEX 30 32 44 43
*1
System reservation
5.4.3 Command
Function: Sends the pump operation commands START, STOP and RESET. These commands
function in the same way as when each switch of the SCU-1600 is pressed. They are valid when
MANUAL/REMOTE changeover switch on the SCU-1600 is "ON" and when being sent to the serial
port which is set as the input operation port in the remote operation mode setting. Refer to Section
3.11, "Parameter set mode".
Transmission frame:
PC->SIM Stx 0 0 1 Bsp E
Parameter 1 Etx LRC
SIM->PC Ack
PC->SIM Ack
SIM->PC Stx 0 0 1 # Etx LRC
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