62 Rockwell Automation Publication 2080-UM002N-EN-E - November 2022
Chapter 5 Communication Connections
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 (Node) Address
Enter a value from 0…254.
Enter 1 for DF1 Full-Duplex.
1
DF1 Mode
(1)
Defines the DF1 mode – Full-Duplex, Half-Duplex master,
Half-Duplex slave, Radio Modem
(2)
.
Configured as full-
duplex by default.
Control Line
• Full-Duplex: No Handshake, Full-Duplex (RTS always ON).
• Half-Duplex slave: No Handshake, Half-Duplex without
continuous carrier (RTS/CTS).
• Half-Duplex master: No Handshake, Half-Duplex without
continuous carrier (RTS/CTS), Full Duplex (RTS always ON).
• Radio Modem: No Handshake, Half-Duplex without continuous
carrier (RTS/CTS), Half-Duplex with DCD Handshake.
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 controller 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
EOT Suppression
Enabled, Disabled
When EOT Suppression is enabled, the slave does not respond
when polled if no message is queued. This saves modem
transmission power and time when there is no message to
transmit.
Disabled
Poll Timeout (x20 ms)
0...65,535 (can be set in 20 ms increments)
Poll Timeout only applies when a slave device initiates a MSG
instruction. It is the amount of time that the slave device waits
for a poll from the master device. If the slave device does not
receive a poll within the Poll Timeout, a MSG instruction error is
generated, and the ladder program needs to re-queue the MSG
instruction. If you are using a MSG instruction, it is
recommended that a Poll Timeout value of zero not be used. Poll
Timeout is disabled when set to zero.
3000
RTS Off Delay (x20 ms)
0...65,535 (can be set in 20 ms increments)
Specifies the delay time between when the last serial character
is sent to the modem and when RTS is deactivated. Gives the
modem extra time to transmit the last character of a packet.
0
RTS Send Delay (x20 ms)
0...65,535 (can be set in 20 ms increments)
Specifies the time delay between setting RTS until checking for
the CTS response. For use with modems that are not ready to
respond with CTS immediately upon receipt of RTS.
0
Message Retries
0...255
Specifies the number of times a slave device attempts to resend
a message packet when it does not receive an ACK from the
master device. For use in noisy environments where message
packets may become corrupted in transmission.
3
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