Edwards SCU-1600

SCU-1600 Control Unit for Turbomolecular Pump
March 10 84 Issue 1-a
5
SERIAL COMMUNICATION PROTOCOL
Error message Value Error message Value
Tuning Error 14 66 Aberrant Brake 72
Tuning Error 15 67 Aberrant Accel 73
Tuning Error 16 68 TMS Voltage Mismatch 74
Tuning Error 17 69 Insufficient Supply 75
Tuning Error 18 70 Inordinate Current 76
Tuning Error 19 71
Table 25 - Error message values (continued)
*1
CAUTION or WARNING message. It is not a state of failure. Refer to Section 7 for details. The STP pump will continue to
operate after one of these messages is displayed. It is recommended that an application be designed with this in
consideration.
5.4.5 ReadModFonct
Function: Reads the pump operation mode and the errors being detected. The data of errors being
detected reads the same data as that of "ReadFailMess".
Transmission frame:
PC->SIM Stx 0 0 1 ? M Etx LRC
SIM->PC Ack
PC->SIM Ack
SIM->PC Stx 0 0 1 Bsp M Parameter 1 to 34
*1
Etx LRC
Parameter Item Data format Remarks
1 Pump operation mode 8-bits hexadecimal coded
ASCII
Refer to Table 26
2 The number of error 8-bits hexadecimal coded
ASCII
Up to 32 errors
*1
Error 1 8-bits hexadecimal coded
ASCII
… …
3 to 34
*1
Error 32
*1
8-bits hexadecimal coded
ASCII
*2
*1
The maximum number of errors may differ depending upon the software version of SCU-1600. It is recommended that an
application be designed as variable-length data.
*2
Value corresponding to the error message is transmitted (refer to Table 24 and Table 25). The most recent error has the
largest parameter number. When the number of errors being detected is under the maximum number, the value of
parameter that is larger than the number of errors being detected is set to 0.