Fire Protection | Data sheet No. 43104 | Version 02-2016 |
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Control unit STG 1.2
Response from the STG 1.2
The response from the STG 1.2 appears as follows:
Byte 0 Byte 1
Byte 2
Byte 3 Byte 4 Byte 5 Byte 6 Byte 7 Byte 8 Byte
Byte Byte n Byte
n + 1
Byte
n + 2
Byte
n + 3
MSB
LSB
MSB
LSB
MSB
LSB
MSB
LSB
MSB
LSB
LSB
MSB
STG
address
Func-
tion
Number
of
databytes
Register x
Register x+1
Re2
……..
Register y
CRC
At the outset the address of the STG 1.2 and the query function are always returned. Then the designation follows regarding the
number of databytes (2 bytes of data are incurred per register). Thereafter the data (register) follows. The register set is dependent
on the query, and can vary between 1 and 125.
Register description:
Each register consists of 2 bytes. With Modbus RTU, it is possible to send 250 bytes of data (MSB is sent first). In this way a total of 125
registers can be read at once with one query.
Register address
Description
0
STG general status
1
Number of connected detectors
2
Status of the detector at Address 1
3
Measured value of the detector at Address 1
4
Contamination in the detector at Address 1
5
Status of the detector at Address 2
6
Measured value of the detector at Address 2
7
Contamination in the detector at Address 2
8
…
9
...
296
Status of the detector at Address 99
297
Measured value of the detector at Address 99
298
Contamination in the detector at Address 99
