DataClient - Terminal software for CHM 15k
Revision R09, November 2016
83
In the above example we don’t see recognized cloud layer, hence the field for
cloud layer is marked with NODET or NODT, short form for "not detected". The
vertical visibility is also not detectable and the detection range is very high. Two
aesorol layers are identified. In sum we can assume clear sky condition.
11.7
Service Code
Each telegram message contains a service code field of 32 bit. The service code
tab lists clearly the Bits by their meaning, see also chapter 8.5 for service code
details. A signal light indicates an alert of the suitable function.
During the start phase of CHM 15k some of these signals may light up. How-
ever, after some minutes the CHM 15k should enter normal operation mode
with all lights switched off. Lights are hints for trouble-shooting.
Every received message from CHM 15k (telegrams & set/get command answers)
contains a checksum in terms of two’s complement. Transmission is checked by
this gibberish total, proper transmission is indicated by value zero in the field
"check sum RS485". Non-zero values indicates transmission problems, cables
and transformers must be checked carefully (proper grounding, termination and
pull up/pull down resistors etc.) and/or the transmission speed should be low-
ered.
Fig. 35: Service Codes in DataClient
Содержание CHM 15k Nimbus
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Страница 14: ......
Страница 20: ......
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