Temperature Interface (TI) Set-Up and Installation

Set-Up

By default the TI is configured with an IP address of 192.168.0.77 and will be monitoring port 80 for a standard HTTP connection.  You will most likely want to change at least the IP of the unit.  The guide below will show how to modify the IP address, in this example we will change the IP address to 192.168.100.50 and the port to 88.

1. If your Local Area Network is on the subnet where the IP address starts with 192.168.0.x, you can plug the TI CAT5 straight into your LAN (on the assumption you don't already have a device with an IP address of the default 192.168.0.77).  Otherwise plug the TI CAT5 connector straight into the Ethernet port on a PC. If you plug straight into the PC you will probably have to set a static IP on your PC to something like 192.168.0.70 - see [this guide] if you are unsure how to do that.
    
2. Open a web browser and connect to http://192.168.0.77, you should see something like:
   
   This is the data returned by the TI (in this case for two sensors), what it means will be covered later, but for now it proves we have a connection.
    
3. To change the IP address to 192.168.100.50 we send the command in the URL:
   
       http://192.168.0.77?ip=192.168.100.50
   
   This will cause an immediate reboot and your browser will fail to load the page because the IP address has now changed.  You may need to change the IP address of your PC again at this stage to make sure you are on the same LAN  as the TI.  Follow the guide mentioned above to set your PC IP address to 192.168.0.49.
   
   Now try connecting to:
   
       http://192.168.100.50
   
   and you should once again see the returned data from the TI.
    
4. To change the port used by the TI to 88, send the command in the URL:
   
       http://192.168.100.50?port=88
   
   This will cause an immediate change of the port monitored by the TI so once again your browser will fail to connect.  This time you need to include the port after the IP address:
   
       http://192.168.100.50:88
   
   This should again show us the data returned by the TI.

At this stage the TI is ready to install. 

 

Installing

1. Decide on your prefered location for the TI, make sure you can get power and the CAT5 cable to it.
2. Drill holes in the case for cable entry and sensor exit - this is best when the entry point won't be seen once the unit is mounted.
3. Mount the sensor(s) so as not to touch a wall as this may cause a low reading.
4. Attach the CAT5 cable then the power cable.
5. Power on.
6. Using a web browser, connect to the TI to check it is sending data as expected.

 

Further Configuration

In order to restrict who can change the IP & port on the TI, a PIN can be set up.  This is a simple 2-byte integer (a number between 1-32000^*) and once set it must be used to make any changes (including the PIN) so don't forget it!  However, if you do forget it, you can do a factory reset (see below).

To set a PIN of 12345 we would need to send a command in the URL (replace the default IP with what ever IP you have configured the TI with):

    http://192.168.0.77?sec=12345

The TI is now configured with a PIN and all commands will be ignored unless this PIN is sent first. 

If you decide you don't like this PIN you can change it, but must enter it before the command to change it, let's say to 112233:

    http://192.168.0.77?pin=12345&sec=112233

This will immediately change the PIN.

^*Yes, we know a 2-byte integer is slightly higher, so help yourself.

 

Sending Commands to the TI

Commands are sent as part of the URL and are sent as a name/value pair.  As with typical GET variables, multiple variables can be sent at once, separated by &.

As the TI is a device to read data, the command set is very limited and is only required for configuration.

The command set is described below:

NAME	VALUES	ACTION
sec	1-32000	Set a PIN for the HI (set to 0 to turn off PIN access)
pin	What ever PIN has been set	PIN used to allow control of the HI
port	A valid TCP/IP port	Used to set which port the HI monitors
ip	A valid TCP/IP address	The address the HI will be located at on the network

 

 

URL Command Examples

COMMAND	ACTION
http://192.168.0.77?ip=192.168.10.1	Change the IP addressNOTE1
http://192.168.0.77?port=88	Change the server port to 88NOTE2
http://192.168.0.77?sec=4321	Set PIN to 4321NOTE3
http://192.168.0.77?pin=4321&port=99	Send a command with PIN enabled, change the port to 99NOTE4

NOTES:

^NOTE1  Changing the IP address will cause an immediate reboot and a new connection will have to be made to the new IP address.
^NOTE2  Changing the server port will cause an immediate reboot and a new connection will have to be made to the new server port at the same IP address.
^NOTE3  Set a security PIN (from 1 to 32000) - once set any command will be ignored unless the PIN has been sent before the command.
^NOTE4  If a PIN has been set, it must be sent first.
It should be noted that the IP address and port can not be changed on one line as each change will cause an immediate reboot.

 

Reading Data From the TI

A full set of data is returned by the TI upon any request, a PIN (if set up) is not necessary to read the data.  The data will be returned as a set of lines similar to:

• The only data returned is the temperature of each attached sensor, one sensor per line - in this example two sensors are attached

 

Factory Reset

 

Should you forget the PIN or IP address, you can force a factory reset.

1. Power off the TI.
2. Insert a link as shown in the diagram.
3. Power on the TI.
4. Wait 20 seconds then power off the TI.
5. Remove the link.
6. Power on the TI.

After a factory reset, the default settings are restored, this includes the IP address and port.  You will have to connect to http://192.168.0.77 to make any changes.