Rockwell Automation 2080-LC20-20QBBR Micro820 20-point Programmable Controllers User Manual - Manual (Page 53)

Rockwell Automation Publication 2080-UM005A-EN-E - December 2013 45
Communication Connections Chapter 5
Configure Modbus RTU
1. Open your Connected Components Workbench project. On the device
configuration tree, go to the Controller properties. Click Serial Port.
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
CIP Serial Driver Parameters