Edwards SCU-800

SCU-800 Control Unit for Turbomolecular Pump
MT-49E-101-G
Page 84
5
SERIAL COMMUNICATION
PROTOCOL
Parameter
Item
Data format
Remarks
1
The number of error
8-bits hexadecimal coded
ASCII
Up to 77 errors
*1
2 to 78
*1
Error 1
8-bits hexadecimal coded
ASCII
*2
…
…
Error 77
*1
8-bits hexadecimal coded
ASCII
*1
The maximum number of errors may differ depending upon the software version of SCU-800. It is recommended that an
application be designed as variable-length data.
*2
Value corresponding to the error message is transmitted, (refer to Table 22 and Table 23). 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.
Example:
The number of error
: 02
hex
= 2 errors
Error 1
: 0D
hex
= 13 = Disturbance Xh
Error 2
: 0F
hex
= 15 = Disturbance Xb
Error 3 to 77
: 00
hex
= No error detected
Parameter
1
2
3
4
5
6
7
8
9
10
ASCII
0
2
0
D
0
F
0
0
0
0
0
0
0
0
0
0
0
0
0
0
HEX
30
32
30
44
30
46
30
30
30
30
30
30
30
30
30
30
30
30
30
30
Parameter
11
12
13
[Omitted]
68
69
70
71
72
73
ASCII
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
HEX
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
Parameter
74
75
76
77
78
ASCII
0
0
0
0
0
0
0
0
0
0
HEX
30
30
30
30
30
30
30
30
30
30