Lufft CHM 15k Nimbus, Manual

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Communication RS485 & Ethernet
40 Revision R09, November 2016
8.3.3 Standard Data Telegram
The standard data telegram consists of 96 Bytes. Data are separated with spaces
(20 HEX). Table 8 shows the exact structure of the message format.
Byte
Value
1
Description
0 <STX> 02 HEX
1 X
2 1
3, 4 TA
5 <SPACE> 20 HEX
6 8
7 <SPACE> 20 HEX
8-10 *** Output interval [s]
11 <SPACE> 20 HEX
12-19 **.**.** Date (dd.mm.yy)
20 <SPACE> 20 HEX
21-25 **.** Time (hh:mm)
26 <SPACE> 20 HEX
27-31 ***** 1
st
cloud layer
32 <SPACE> 20 HEX
33-37 ***** 2
nd
cloud layer
38 <SPACE> 20 HEX
39-43 ***** 3
rd
cloud layer
44 <SPACE> 20 HEX
45-48 **** Laser beam penetration depth into 1
st
cloud layer
49 <SPACE> 20 HEX
50-53 **** Laser beam penetration depth into 2
nd
cloud layer
54 <SPACE> 20 HEX
55-58 **** Laser beam penetration depth into 3
rd
cloud layer
59 <SPACE> 20 HEX
60-64 ***** Vertical visibility
65 <SPACE> 20 HEX
66-70 ***** Maximum detection range
71 <SPACE> 20 HEX
72-75 **** Cloud height offset/ parameter altitude(m)
76 <SPACE> 20 HEX
77, 78 Ft/m<SPACE> Unit of measure (ft/m)
79 <SPACE> 20 HEX
80, 81 ** Precipitation index
82 <SPACE> 20 HEX
83-90 ********
System status and messages (flags may take on “0” or “1”
state)
91 <SPACE> 20 HEX
Table 8: Standard data telegram format,
1
(*) = any character