Eaton Power Xpert Gateway UPS User's Guide download pdf (Page 61)

Eaton Power Xpert Gateway PXGX UPS Card User’s Guide 164202123—Rev 1 57

Chapter 7 Modbus Registers

This chapter describes the UPS data that is available through the Modbus TCP/IP protocol. The UPS monitors

several parameters, such as voltage, current, power, and alarms. The value of each parameter is stored in a

corresponding Modbus data register.

The values of the parameters can be read over an Ethernet network by using Modbus TCP/IP building

management programs or Modbus TCP/IP analyzer programs.

Note: If your Modbus program requires one-based addressing, add a one to the register addresses listed in

Table 10 on page 60. For example, one-based addressing for the vendor name would be 1033

(1032 + 1).

Obtaining the Modbus Register Map

To view a list of the Modbus registers in your UPS:

1. Select Modbus TCP Register Maps from the Documentation menu.

2. Select the hardware type from the Select a map to generate pull-down menu.

3. Most Modbus-TCP clients automatically decrement addresses by one before using them. If your client

does not alter addresses in this way, clear the Use 1-based addressing check box.

4. Click View Register Map. A dialog box opens.

5. Click Open to view or Save to save the file.

Note: The Modbus file is a comma-separated values (*.csv) file that can be opened in Microsoft Excel

software. Some computer configurations automatically open the files in the Microsoft Excel software

instead of prompting you to save the file.

6. If you select Save, select a location for the pxgx-modbus-uid-XXX.csv file, where XXX is the UnitID of the

requested map.

Note: Some browsers leave a blank window open after you save or view the file. Close the window.

Returning Error Codes

By default, the PXGX UPS Card returns a Modbus error code when it receives an incoming register/discrete/

coil READ request for an address that is not currently valid. To improve performance in some situations, you

can configure the card to disable this error response and instead return zero-filled data in all of the invalid

address ranges.

To change how error codes are returned:

1. Select Modbus TCP from the configuration menu.

2. Clear the Return (vs. zeros) error on unsupported read request check box to disable the error code or

select the check box to enable the error code.

3. Click Apply and then OK to save the setting.

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Eaton Power Xpert Gateway UPS User's Guide Page 61