88 Rockwell Automation Publication 1789-UM002K-EN-P - January 2015
Chapter 4 Communicate with Serial Devices
DF1 Slave Configuration
DF1 Master Configuration
Field Description
Station Address The station address for the serial port on the DF1 slave.
Enter a valid DF1 address (0…254). Address 255 is reserved for broadcast messages. The default is 0.
Transmit Retries The number of times the remote station retries a message after the first attempt before the station declares the message undeliverable.
Enter a value 0…127. The default is 3.
Slave Poll Timeout Specifies the amount of time the slave station waits to be polled by a master before indicating a fault.
Enter a value 0…32767. Limits are defined in 20 ms intervals. The default is 3000 (60,000 ms).
EOT Suppression Choose whether to suppress sending EOT packets in response to a poll. The default is not to suppress sending EOTpackets.
Error Detection Choose BCC or CRC error detection.
Configure both stations to use the same type of error checking.
BCC: the controller sends and accepts messages that end with a BCC byte for error checking. BCC is quicker and easier to implement in a
computer driver. This is the default.
CRC: the controller sends and accepts messages with a 2-byte CRC for error checking. CRC is a more complete method.
Enable Duplicate Detection Choose whether the controller should detect duplicate messages. The default is duplicate detection enabled.
Table 5 - Master Station Configuration
Field Description
Station Address The station address for the serial port on the DF1 master.
Enter a valid DF1 address (0…254). Address 255 is reserved for broadcast messages. The default is 0.
Transmit Retries Specifies the number of times a message is retried after the first attempt before being declared undeliverable.
Enter a value 0…127. The default is 3.
ACK Timeout Specifies the amount of time you want the controller to wait for an acknowledgment to its message transmission.
Enter a value 0…32767. Limits are defined in 20 ms intervals. The default is 50 (1000 ms).
Reply Message Wait Message-based Polling mode only
Specifies the amount of time the master station waits after receiving an ACK to a master-initiated message before polling the slave station
for a reply.
Enter a value 0…65535. Limits are defined in 20 ms intervals. The default is 5 (100 ms).
Polling Mode Choose one of these:
• Message -based (slave cannot initiate messages)
• Message-based (slave can initiate messages) - default
• Standard (multiple message transfer per node scan)
• Standard (single message transfer per node scan)
Master Transmit Standard Polling modes only
Choose when the master station sends messages:
• Between station polls (default)
• In polling sequence
Normal Poll Node Tag Standard Polling modes only
An integer tag array that contains the station addresses of the slave stations.
Create a single-dimension array of data type INT that is large enough to hold all the normal station addresses. The minimum size is three
elements.
This tag must be controller-scoped. The format is:
list[0] contains total number of stations to poll
list[1] contains address of station currently being polled
list[2] contains address of first slave station to poll
list[3] contains address of second slave station to poll
list[n] contains address of last slave station to poll
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