Lufft CHM 8k, Руководство пользователя, Страница: 33 / 72

Operating Manual CHM 8k
R1.7 / 01-2020
Communication via RS485 & Ethernet 33
the standard data telegram (S), extended data telegram (L) or raw data telegram (A) are called up once
only. For the format of the respective data telegram, see section 8.3.3 to 8.3.5
(Table 8 , Table 9 , Table
12).
Further telegrams
The hardware of the
CHM 8k supports further user telegrams.
In addition to the characters {S, L, A}, numbers are also supported. With S = 1, L
= 2, A = 3, the first three numbers are predefined.
8.3.2 Automatic output mode
With the command
set<SPACE><RS485Number>:TransferMode=1<CR><LF>
the automatic mode is set with a standard telegram output. Its repetition rate depends on variable dt(s)
that is set to 15 seconds by default.
Table 8 contains the format of the standard data telegram.
The output of the extended data telegram is set with the command
set<SPACE><RS485Number>:TransferMode=2<CR><LF>
Table 9 contains the format of the extended data telegram.
The raw data telegram is output via the following command:
set<SPACE><RS485Number>:TransferMode=3<CR><LF>
Table 12 contains the format of the raw data telegram.
Transfer modes 4 … 9
The transfer modes 4 ... 9 are additional predefined data telegrams.
8.3.3 Standard data telegram
The standard data telegram consists of 96 bytes. The data is separated by spaces (20 HEX). Table 8
shows details of the format structure.
Byte Value Description
0 <STX> 20 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 **** Cloud layer 1
32 <SPACE> 20 HEX