UPS for 400 Vac Grid, User Guide, doc. rev. 4
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Two types of Modbus links can be defined between the UPS and another device on the network:
a serial link or a TCP/IP link. The two types of links are not mutually exclusive. In either case, with
regards to Modbus, the UPS is a slave device to the Modbus master located elsewhere on the
Modbus communication network. The UPS will respond to queries from the Modbus master.
The UPS’s Modbus interface is compatible with most Building Management Systems (BMSs),
using the register numbers shown in Table 7.
The registers in Table 7 can be addressed either as holding registers (for example,
4x0001) or as input registers (for example, 3x0001).
8.2.6.5.1.
Defining a TCP Modbus link
Enter a unit ID (the UPS’s ID on the Modbus network) and a TCP port number, as supplied by your
Modbus network administrator, and select the “Allow TCP Modbus” checkbox.
8.2.6.5.2.
Defining a serial Modbus link
Select a protocol (RTU or ASCII) and a baud rate, as recommended by your Modbus network
administrator, and select the “Allow serial Modbus” checkbox.
Figure 71: Defining Modbus communication parameters
The UPS's physical connection for serial Modbus is a 4-pin connector (P5) located in “connector
group 2” and labeled RS485.
