Editing the mrtg.cfg file for monitoring the ENVIROMUX-SEMS-16:

1. The first step is to configure your ENVIROMUX-SEMS-16. Attached there 
is an example of a configuration file for monitoring two sensors: The 
internal temperature sensor and an external temperature sensor plugged 
into connector #1

2. If you want to add more sensors to the file, you will need to know 
the MIB OID for that sensor. They can be found in the MIB file delivered 
with the ENVIROMUX-SEMS-16 unit. Change the OID on the “Target” line with 
the desired OID (please note, that it appears twice on that line and both 
occurrences need to be replaced). Also note the sensors are grouped in 
tables (in the MIB structure) and the index in the table corresponds to 
the physical connector in pairs. For example: a temperature and humidity 
sensor plugged into connector #12 will have the OID of “extSensorValue.23” 
for temperature, and “extSensorValue.24 for humidity. Single function 
sensors will use only the first number of the connector pairs, (2*n)-1 
where n is the connector number.
 
3. You can edit the file with any text editor of your choice.

4. Change all IP address entries from 192.168.1.21 to the IP address 
of your ENVIROMUX-SEMS-16

5. If you change the Community Name in the ENVIROMUX-SEMS-16 you need to 
change “public” to the same name.

6. The names in the [ ] brackets are the names for the files where the 
graphic images are saved. Ex. [rmtemp] for the room temperature sensor, 
these can be changed if desired. This will generate a rmtemp.html file as 
well as the rmtemp*.png files.

7. The temperature sensor configuration section must be set to the same range 
(Fahrenheit or Celsius) as the ENVIROMUX-SEMS-16. If Fahrenheit is selected 
the configuration file must be set to Fahrenheit ranges. If Celsius is 
selected the configuration files must be set to Celsius.      
(see the Examples in the sample mrtg.cfg file)

8. Change the WorkDir: /home/web/mrtg/ to the location where the web server 
can use the files.

9. Once you are satisfied you have the configuration file set up the way you 
want it, you can save the file and then try running the MRTG command.