Lufft CHM 15k Nimbus, Руководство пользователя

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Communication RS485 & Ethernet
Revision R09, November 2016 41
A maximum of three cloud heights can be indicated. If less than three could
heights were detected, a “
NODET ” message will appear in the remaining
field(s). Missing cloud penetration depths will be reported through a “ NODT ” in
the standard telegram message caused by the limited field size.
The fields:
l
Cloud height
l
Cloud penetration depth/Cloud thickness
l
Visibility
l
Maximum detection range
will show a “ NODET ” value too, whenever the algorithm is not able to calculate
these values. The same fields will carry a “ - ” minus sign if their values cannot be
established because of a device error. For detailed information on device error
types, you should refer to the service codes table (refer to chapter 8.5).
In general, the cloud height shall be measured from the unit base. If the param-
eter “altitude(m)” is set to a nonzero value and “usealtitude” is set to 1 the cloud
height is corrected by this factor. In NetCDf files the variable
CHO indicates
whether usealtitude is set or not.
92, 93 **
Checksum (two's complement of the sum of bytes 0 to 96,
excluding bytes 92 and 93,expressed in hex code)
94 <CR> 0D HEX
95 <LF> 0A HEX
96 <EOT> 04 HEX
Byte
Value
1
Description
Table 8: Standard data telegram format,
1
(*) = any character