Kendro HERAcell 150, Operating Instructions Manual

Page: 37 / 251

CO
2
Incubator HERAcell ® 150 Operating Instructions
37
5. Start-up
Command list - Requesting failure codes
Command:
1001 0000 (90
H
)
Data:
none
Response - Reading failure codes
The microprocessor returns a total of 10 bytes (5 integer values). Each integer
value represents a current failure code in the assigned control loop (incubati-
on temperature, CO
2
content, decontamination temperature, general, O
2
con-
tent).
The failure code "General failure" belongs to a superior failure that is shown
simultaneously in all displays (e.g. failure code 99).
The failure codes for incubation temperature and decontamination temperature
are shown in the temperature display, the codes for CO
2
are shown in the CO
2
display, the codes for O
2
are shown in the O
2
display. Value "---" shows that there
is no current failure.
Faulty response from control unit:
If a returned response is incomplete or faulty, the CPU responds with an NAK
(15
H
, only 1 byte, without frame). Otherwise, the command code (with pertai-
ning length information) is regarded as a response and the data that may be
required is transmitted.
Particularities during data communication:
For the data communication between PC and microcontroller, the following par-
ticularities must be observed:
The microprocessor stores an
int or unsigned int value with the sequence
<Highbyte>, <Lowbyte> in the memory. For the PC, this sequence is reversed.
The microcontroller transmits these values in its format, i.e. the PC must reverse
the sequence of the bytes. For floats, there is no difference.
Example: Temperature data request and response
Request
O2
H
61
H
10
H
8E
H
03
H
Response:
O2
H
6D
H
01
H
72
H
38
H
91
H
C7
H
41
H
F5
H
6B
H
F4
H
43
H
9E
H
00
H
32
H
4B
H
03
H
integer float intern
(37.0) (24.946)