SMSAWS data message format

The SMSAWS data message is a Vaisala standard ASCII‑based observation data message. It is updated once a minute.

The format of the SMSAWS data message is:

<SOH>SMS<SP><station ID><STX(S:<station name>;D:<YYMMDD>;T:<HHMMSS>;
STNID:<station ID>;MSGID:<message ID>;<tag 1>:<value 1>;...<tag N>:<value N>)
<CRC><CR><LF><ETX>

SMSAWS message data fields
Name	Description
<SOH>	Start of header character, ASCII code 1 ¹
SMS	Fixed message identifier
<SP>	Space character, ASCII code 32 ¹
`<station ID>`	Station identifier ¹
<STX>	Start of text, ASCII code 2
(	Start character, ASCII code 40 ¹
:	Tag and value delimiter
;	Element delimiter
S:`<station name>`	Station name
D:`<YYMMDD`>	Date of data message generation (UTC), according to ISO 8601 standard
T:`<HHMMSS>`	Time of data message generation (UTC), according to ISO 8601 standard
STNID:`<station ID>`	Station identifier
MSGID:`<message ID>`	Message identifier, running number, not unique
`<tag>`	Observation tag. See the following table.
`<value>`	Observation value
)	End character, ASCII code 41
`<CRC>`	32-bit CRC checksum, which is calculated over all characters between the `(` and `)` characters, including `(` and `)`. The checksum has fixed length of 8 characters, and it is presented in ASCII HEX format. The properties of the checksum are: Polynomial: 0x04C11DB7 Initial value: 0xFFFFFFFF Reverse data bytes: True Reverse CRC result: True Invert result bits: True With these properties, the result of the commonly used test vector `123456789` is `0xCBF43926`.
<CR>	Carriage return character, ASCII code 13
<LF>	Line feed character, ASCII code 10
<ETX>	End of text character, ASCII code 3 ¹

Observation tags in SMSAWS data message

Observation tags consist of the following fields, separated by the pipe character (|):

<observation>|<statistics>|<period>|<height>|<sequence number>|<unit>|

GHI|AVG|PT1M||1|W/M2|

SMSAWS observation tag fields
Name	Description
`<observation>`	Observation code
`<statistics>`	Method used for calculating the observation. Possible values: `VALUE`: A single measurement or datum. `MIN`: The smallest value in the sample. `MAX`: The largest value in the sample. `AVG`: The sum of the values divided by the sample size (mean). `SUM`: The sum of all values in the sample.
`<period>`	The period related to the statistics name. The period field consists of the following: Duration designator `P` Time designator `T` Time value, for example, `1` Time element designator: `H` for hours `M` for minutes `S` for seconds For example, `PT1M` for 1 minute.
`<height>`	The height (in meters) in which the observation was created. Empty if not set.
`<sequence number>`	The index for identifying the observation when the weather station contains multiple sensors that provide the observation in question. Empty if not set.
`<unit>`	Unit of the observation. Empty if the observation does not have a unit.

Example of SMSAWS report without header

The actual message does not contain line feeds.

(S:Station 1;D:230524;T:113700;MSGID:2;
LAT:60.28;LON:24.88;ALT:0;
POAI|AVG|PT1M||1|Wpm2|:2.0;RPOAI|AVG|PT1M||1|Wpm2|:1.0;
GHI|AVG|PT1M||1|Wpm2|:2.0;PVT|AVG|PT1M||1|degC|:23.3;
WS|AVG|PT1M||1|mps|:0.0;WD|AVG|PT1M||1|deg|:0;
PA|AVG|PT1M||1|hPa|:1014.0;RH|AVG|PT1M||1|%|:31;
TA|AVG|PT1M||1|degC|:22.8;TD|AVG|PT1M||1|degC|:4.6;
PR|SUM|PT24H||1|mm|:0.0;PRF|VALUE|PT1M||1|mmph|:0.0)2ADF6272

SMSAWS data message format - AWS810-SOLAR

AWS810 Solar Edition System Description

Observation tags in SMSAWS data message

Example of SMSAWS report without header