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Parameter | Report Frequency | Purpose | Notes | |
|---|---|---|---|---|
| 1 | Pressure measurement | Once per minute every 5 sec [TBC] | Environmental monitoring | Managed through configuration file |
| 2 | Temperature measurement | Once per minute every 5 sec [TBC] | Environmental monitoring | |
| 3 | Relative humidity measurement | Once per minute every 5 sec [TBC] | Environmental monitoring |
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Required Alarms
Parameter | Threshold | Notes | |
|---|---|---|---|
| 1 | Time of last connection | More than 10 seconds | |
| 2 |
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Relevant Datasheets & Manuals
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Description | Files | |||||
|---|---|---|---|---|---|---|
| 1 | Python 2 software written by a student some years back. These lines of code were used to read values from the Vaisala while it was installed at Keck. That installation was using a USB interface on a Windows machine. Not sure if the current serial interface will change anything here. |
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| 2 | As part of the KROOT distribution, there is a SerialStream interface which manages connections to and from serial hosts. This includes managing Lantronix connections. |
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Dispatcher Implementation
Keyword | Value | Type |
|---|---|---|
VAISALA_CONN | On or Off - controls whether or not the connection to the Lantronix is on or off. Can be used if the Vaisala needs to be unplugged and moved, for example. | Boolean which is writable. |
VAISALA_IP | IP address of the Lantronix box. | String set in the configuration file, only readable. |
VAISALA_PORT | Port for the Lantronix box that talks to the correct serial device. | String set in configuration file, only readable. |
VAISALA_RETVAL | Value returned by Vaisala. | String. The format is set in the configuration file. Only readable. |
VAISALA_TIME | Time stamp of when the last RETVAL was received. | Unix timestamp (binary) or time stamp (ascii). Only readable. |
VAISALA_PRES | Pressure value in units of hPa. | Double value from RETVAL, read only. |
VAISALA_RH | Relative humidity in %. | Double value from RETVAL, read only. |
VAISALA_TEMP | Temperature in deg C. | Double value from RETVAL, read only. |
Configuration | Value | Explanation |
|---|---|---|
prefix | Vaisala | Prefix of the keyword names. If this is going to be changed, needs to be changed in XML directory as well. |
ip | 192.168.23.102 | IP address of the Lantronix box. |
port | 10001 | Port that is used for Vaisala, this is port 1. |
format_str | form 9.4 "P=" P " " U6 6.4 "T=" T " " U3 6.4 "RH=" RH " " U4 \r \n | Format statement of the output from the Vaisala. At dispatcher start up and at every new connection, this value is sent to the Vaisala. The #.# sets the number of characters (first # ) and the second # sets the number of characters after the decimal point. There must be a space between the characters that notes what the value is (such as P=) and the actual value (the P). The code uses the characters (P=, RH= or T=) to determine what the next value is. |
poll_time | 5 | Time between reads of the Vaisala in seconds. |