Rockwell Automation Publication 2080-UM002L-EN-E - November 2021 65
Chapter 5 Communication Connections
5. Click Advanced Settings and set Advanced parameters.
See Table 5 for a description of the CIP Serial parameters.
Configure Modbus RTU
1. Open your Connected Components Workbench project. On the device
configuration tree, go to the Controller properties. Click Serial Port.
Table 5 - CIP Serial Driver Parameters
Parameter Options Default
Baud rate
Toggles between the communication rate of 1200, 2400, 4800,
9600, 19200, and 38400.
38400
Parity
Specifies the parity setting for the serial port. Parity provides
additional message-packet error detection. Select Even, Odd, or
None.
None
Station Address
The station address for the serial port on the DF1 master. The only
valid address is 1.
1
DF1 Mode DF1 Full Duplex (read only)
Configured as full-
duplex by default.
Control Line No Handshake (read only)
Configured as no
handshake by default.
Duplicate Packet
Detection
Detects and eliminates duplicate responses to a message.
Duplicate packets may be sent under noisy communication
conditions when the sender’s retries are not set to 0. Toggles
between Enabled and Disabled.
Enabled
Error Detection Toggles between CRC and BCC. CRC
Embedded Responses
To use embedded responses, choose Enabled Unconditionally. If
you want the controller to use embedded responses only when it
detects embedded responses from another device, choose After
One Received.
If you are communicating with another Allen-Bradley device,
choose Enabled Unconditionally. Embedded responses increase
network traffic efficiency.
After One Received
NAK Retries
The number of times the controller will resend a message packet
because the processor received a NAK response to the previous
message packet transmission.
3
ENQ Retries
The number of enquiries (ENQs) that you want the controller to send
after an ACK timeout occurs.
3
Transmit Retries
Specifies the number of times a message is retried after the first
attempt before being declared undeliverable. Enter a value from
0…127.
3
ACK Timeout (x20 ms)
Specifies the amount of time after a packet is transmitted that an
ACK is expected.
50
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