MES 7 is a Vaisala proprietary message format.
In FD70, MES 7 can be used without framing or, for backwards compatibility, with FD12 framing, PWD framing, and FS11 framing. This means that MES 7 contains optionally a FD12, PWD, or FS11 header and footer, and a message body. If you want a checksum, FS11 is the only option.
MES 7 message body contains 3 or 4 lines:
-
The first line is of fixed length. It contains overall status information, and visibility, precipitation, present weather, temperature, and background luminance information.
-
The second line contains present weather and the third line contains recent weather according to the WMO code table 4678 (METAR) format. The lines are not of fixed length because METAR codes can be combined in many ways. It is normal for these lines to be empty.
-
The optional fourth line contains detailed status and alert data on the device and its components. The line is a fixed length ASCII string with more than 120 characters. Each character position values follow the principle; 0 = OK, I = Indication, W = Warning, A = Alarm. The line ends with CRLF like lines 1-3. Depending on the need, the user can either enable or disable the line over user interface.
MES 7 message data fields
ah visii visia pty wi wa wh iii.ii aaa.aa ssss ttt.t bbbbbCRLF
<present METAR>CRLF
<recent METAR>CRLF| Position | Name | Description | Value/Range |
|---|---|---|---|
| Line 1 | |||
| 1 | a | Reserved | Fixed 0 (zero) |
| 2 | h |
Overall alert |
0 = OK 1 = Alarm 2 = Warning |
| 4 - 8 | visii | MOR, 1-minute average in meters | 0 … 99999 |
| 10 - 14 | visia | MOR, 10-minute average in meters | 0 … 99999 |
| 16 - 18 | pty | Precipitation type (NWS code), consists of precipitation type and intensity identifier | |
| 16 | p |
First letter of 2-digit precipitation type Otherwise SPACE |
A … Z, (Space) |
| 17 | t | Second letter of 2-digit precipitation type or 1-digit precipitation type | A … Z |
| 18 | y | Intensity identifier |
+ (plus) = Heavy − (minus) = Slight (Space) = Moderate |
| 20 - 21 | wi | Present weather instant (1 min) (SYNOP: WMO table 4680) | 0 … 99 |
| 23 - 24 | wa | Present weather 15 min (SYNOP: WMO table 4680) | 0 … 99 |
| 26 - 27 | wh | Present weather 1 h (SYNOP: WMO table 4680) | 0 … 99 |
| 29 - 34 | iii.ii | Precipitation intensity (mm/h) | 0.00 … 999.99 |
| 36 - 41 | aaa.aa | Precipitation accumulation (mm) | 0.00 … 999.99 |
| 43 - 46 | ssss | Snow accumulation (mm) | 0 … 9999 |
| 48 - 52 | ttt.t | Ambient temperature (°C) | −99.9 … 99.9 |
| 54 - 58 | bbbbb | Background luminance (cd/m2) 1 | 0 … 99999 |
| 59 | CR | Carriage return | 0x0D |
| 60 | LF | Line feed | 0x0A |
| Line 2 | |||
| − | present METAR |
Present METAR according to METAR WMO table 4678 Variable length, 0-12 characters |
See FD70 weather codes (SYNOP/METAR/NWS). |
| − | CR | Carriage return | 0x0D |
| − | LF | Line feed | 0x0A |
| Line 3 | |||
| − | recent METAR |
Recent METAR according to WMO table 4678 The prefix RE stands for "recent" Variable length, 0-8 characters |
See FD70 weather codes (SYNOP/METAR/NWS). |
| − | CR | Carriage return | 0x0D |
| − | LF | Line feed | 0x0A |
MES 7 alerts
MES 7 shows only warnings and alarms. MES 7 does not show the lowest severity status, information (I).
The first alert character (in position 1) is a MOR alarm. It is not used and the value is always 0.
- 2 for warning, if the overall status is W.
- 1 for alarm, if the overall status is A.
- 0 in other cases.
Example of MES 7 without framing
00 15256 10394 RS- 67 67 72 0.16 46.82 443 0.3 12345CRLF
-RASNCRLF
RESNCRLF
Example of MES 7 with framing
SHFD ASX00 15256 10394 RS- 67 67 72 0.16 46.82 443 0.3 12345CRLF
-RASNCRLF
RESNCRLF
EXCRLF
| Missing or invalid values are indicated with slashes (/////). |
| Value | Explanation |
|---|---|
| 0 | − (not used) |
| 0 | Overall alert status normal |
| 15256 | MOR, 1-minute average in meters |
| 10394 | MOR, 10-minute average in meters |
| RS− |
Precipitation type (NWS code), consists of precipitation type and intensity identifier RS = Rain (or drizzle) and snow − = Slight |
| 67 | Present weather instant (1 min) (SYNOP): rain (or drizzle) and snow, slight |
| 67 | Present weather 15 min (SYNOP): rain (or drizzle) and snow, slight |
| 72 | Present weather 1 hour (SYNOP): snow, moderate |
| 0.16 | Precipitation intensity (mm/h) |
| 46.82 | Precipitation accumulation (mm) |
| 443 | Snow accumulation (mm) |
| 0.3 | Ambient temperature (°C) |
| 12345 | Background luminance (cd/m2) |
| -RASN | Present METAR according to METAR WMO table 4678: Rain (or drizzle) and snow, slight |
| RESN | Recent METAR according to METAR WMO table 4678: snow |