Rockwell Automation AADvance Controller Demo Unit - Manual (Page 45)

Document: 553850 Issue 1.2: March 2011 4-11

The default setting for the Port field suits most systems; occasionally, you will
have to adjust it. Make sure the Port field matches the port expected by the
Modbus master.
If the Port field is set to 502, Modbus TCP protocol is enabled. All other settings of the
Port field will enable Modbus RTU protocol packaged as a serial stream over Ethernet. This
can be converted back to a serial connection using a standard terminal server.
Note: The range of values accepted for the Id field, and the default value for the
Port field, vary according to the protocol selected.
1) Click Apply.
Modbus Slave Communication Parameters
Each Modbus slave has a series of communication parameters as detailed in the tables.
Table 7: Modbus RTU Slave Parameters
Description Value(s) Default Remarks
Connection Not Configured, Sn-1, Sn-2,
Ethernet (†) Not
Configured
Id 1 to 247
(serial);
1 to 255
(Ethernet)
1
(serial);
255
(Ethernet)
Represents the Slave ID
for a serial connection
Represents the Unit ID for
an Ethernet connection
Port 0 to 65,535 2000 Only used with Ethernet
connections
Note: (†) The letter 'n' identifies the processor module:
1 = processor A, 2 = processor B, 3 = processor C.
Table 8: Modbus TCP Slave Parameters
Description Value(s) Default Remarks
Connection Not Configured, Ethernet Not
Configured
Id 1 to 255 1
Port 0 to 65,535 502