G
AMATRONIC
E
LECTRONIC
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NDUSTRIES
L
TD
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CENTRIC 3x480, User Guide, rel. 1.7
The Centric’s Modbus interface is compatible with most Building Management Systems (BMSs), using the
register numbers shown in Table 6.
Note:
The registers in Table 6 can be addressed either as holding registers (for example, 4x0001) or as
input registers (for example, 3x0001).
7.2.7.4.1
D
EFINING A
TCP
M
ODBUS LINK
Enter a unit ID (the Centric’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.
7.2.7.4.2
D
EFINING A SERIAL
M
ODBUS LINK
Choose a protocol (RTU or ASCII) and a baud rate, as recommended by your Modbus network
administrator, and select the “Allow serial Modbus” checkbox.
The Centric’s physical connection for serial Modbus is a D9 connector located in “connector group 2” and
labeled RS485. (See the
Centric 3x480 Installation Guide
for more information about this connector.
Figure 38: Defining Modbus communication parameters
