Rockwell Automation AADvance Controller Demo Unit User 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

1 to 247

(serial);

1 to 255

(Ethernet)

(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