1-Wire Network Diagnostic

When performing this procedure, the contents of the GOC will be exposed. Power must be retained during these steps. Extreme caution must be taken.

warning ELECTROCUTION HAZARD! HIGH VOLTAGE PRESENT. USE care when securing component connections.

1. Use a Phillips screwdriver to open the right side cover of the GOC.

This step confirms that the communication connections are made securely and properly to the appropriate ports.

1. Verify that the USB to 1-Wire Adapter is properly connected. See Figure 2.

   Figure 2. USB to 1-Wire Adapter

   

2. Verify that connections in Run 1383 are secure from USB to 1-Wire Adapter output port to the iButton Sensor 5141857-5 on the back of the GOC. (See Figure 1 and Figure 3).

   Figure 3. Operator Console

   

3. Verify that connections in Run 1384 are secure from iButton Sensor 5141857-5 on the back of the GOC to iButton Sensor 5141857-4 on System Cabinet. (See Figure 1, Figure 3, and Figure 4).

   Figure 4. System Cabinet

   

4. Verify that both iButton disks are fully seated in the iButton holder receptacles. (See #id_SL2164992-1268349/SL2165122-1268349).
5. Verify that the sensor on the back of the GOC is labeled “Operator Console.” (See Figure 3).
6. Verify that the sensor on the System Cabinet (in the equipment room) is labeled “System Cabinet.” (See Figure 4).

1. Run the 1-Wire Network Diagnostic Tool by selecting: Diagnostics >> Peripherals >> 1-Wire Network Diagnostic.

   Figure 5. 1-Wire Network Diagnostic

   

2. The 1-Wire Diagnostic checks to see if all of the 1-Wire devices in the network are connected (GOC and EQUIP). The diagnostic also outputs temperature and humidity values for the GOC and Equipment Room Sensor. All 1-Wire devices detected by the 1-Wire Network Diagnostic display in blue text in the Test Output area (see Figure 6). 1-Wire devices which are not detected display in red text (see Figure 7).

   • If desired, enter or select alternate test parameters as described below.

   • To run the diagnostic more than once, enter a different value in the Iterations field.

   • To force the 1-Wire network to be remapped, select Force 1-Wire Reset. This is useful when hardware has been replaced to identify 1-Wire devices in the new hardware.

     note:

     A TPS Reset also accomplishes a 1-Wire Reset, but any new hardware installed during troubleshooting can be identified using this option prior to doing a TPS Reset.

   Figure 6. 1-Wire Devices Detected by the 1-Wire Network Diagnostic

   

   Figure 7. 1-Wire Devices Not Detected by the 1-Wire Network Diagnostic

   

1. Verify iButton is seated correctly. An example of the iButton not seated is shown in Figure 8.

   Figure 8. iButton Not Seated

   

2. Verify that there is a good connection between iButton and holder (no intermittent or shorted connections). Examples of intermittent and shorted connections are shown in Figure 9 and Figure 10.

   Figure 9. Intermittent Connection

   

   Figure 10. iButton and Holder

   

   note:

   If disconnecting the iButton cable from the 1-Wire Hub results in detection of the opposite iButton, this suggests that the disconnected iButton or holder was shorting out the hub bus. Removing the failing iButton from its holder and slightly bending the holder contacts away from the traces underneath may restore functionality. Applying insulating tape as shown in Figure 10 may also help. Otherwise, replace the holder.

1. System needs a TPS reset or "Force Reset" in the 1-Wire Diags if an iButton is replaced.
2. The estimated life of an iButton, assuming a 30-minute sample rate, is from 5 to 7 years; an increase in sample rate decreases the iButton life span.
3. Sensors must be located on the outside of cabinets in the locations shown in the installation manual. Locating sensors on the inside of cabinets obscures the ability to sense the actual room temperature and humidity.
4. Convert degrees Fahrenheit to degrees Celsius using this formula:

   C = (F - 32) / 1.8

5. Convert degrees Celsius to degrees Fahrenheit using this formula:

   F = (C x 1.8) + 32

1. Install Service Key.
2. Open the Common Service Desktop and select Utilites -> Toolbox -> Environmental Monitoring. See Figure 11.
3. Select "click here to start this tool".

   Figure 11. Environmental Monitoring

   
   
   

4. View the output similar to the one shown in Figure 12. From the dropdown under "Choose data to view" you can select GOC temperature, GOC humidity, Equipment Room Temperature, or Equipment Room Humidity. Date and time are also displayed.

   Figure 12. Output

   
   
   

   If none of these steps lead to successfully restoring communication between the sensors and the GOC, the sensors may need to replaced. These sensors are simple devices rated to last for 150,000 iterations (or approximately seven years) on the HDx Series system. They should not need replacing unless they have approached that level of usage.