User`s guide

Modbus Registers
Eaton Power Xpert Gateway PXGX UPS Card User’s Guide 164202123—Rev 1 59
UPS Unit ID Numbers
The Unit IDs associated with the Modbus registers apply to specific load groups or segments (see Table 9).
The UPS has a Unit ID of 0, 1, or 255, while load groups or segments within the UPS have Unit IDs that range
from 2 to 65 (for load groups or segments 1 to 64).
If there is an optional Environmental Monitoring Probe (EMP) installed, use Unit ID 254 to obtain EMP data. See
“EMP (FC 04)” on page 61 for more information.
UPS Registers and Alarms
This section contains information for the UPS Registers (FC 04) and UPS Alarms (FC 02).
UPS Registers (FC 04)
Table 10 provides a partial list of data registers that are available from a UPS. Not all registers may be available
in your UPS or in selected load groups.
To read the vendor name in the UPS, set the Modbus program to Unit ID 1 and register 1032:
IP: <IP address of UPS>
Unit ID: 1
Starting Register: 1032
Number of registers: 32
Function Code: 04
The UPS returns 32 registers containing up to 64 characters. There are two ASCII characters per register, so
the vendor name could be displayed as EATON.
To read the UPS output voltage from Phase C to Neutral, set the Modbus program to Unit ID 1 and register
4050:
IP: <IP address of UPS>
Unit ID: 1
Starting Register: 4050
Number of Registers: 2
Function Code: 04
The UPS returns a floating point value of the output voltage from Phase C to Neutral (such as 120.7 volts) of
the UPS at the specified IP address.
Table 9. UPS Unit ID Numbers
Unit ID Description
0, 1, 255 UPS Summary Data
2–65 Load Groups or Segments Data
254 Environmental Monitoring Probe