Rockwell Automation Publication 5069-UM003B-EN-P - January 2020
61
Compact 5000 I/O Serial Module Features
Chapter 3
Serial Port Protocol parameters and defaults can be found in the following table.
Use the following table to understand the communication parameters you need
to specify on the Channel Configuration screen.
DF1 Radio Modem Protocol
The DF1 Radio Modem protocol is used when connecting from the controller to
multiple devices over Radio Modems. (This Radio Modem should not analyze/
translate protocol by itself )
Figure 18 - DF1 Radio Modem Protocol
Field
Description
Default
Station Address
The station address for the serial port on the DF1 slave. Enter a valid DF1 address (0…254).
0
Transmit Retries
The number of times the slave station retries a message after the first attempt before the station declares the message undeliverable.
Enter a value 0…127.
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. See ‘Configuring Slave Poll Timeout’ for further details.
3000 (60,000 ms)
EOT Suppression
Select whether to suppress sending EOT packets in response to a poll. The default is not to suppress sending EOT packets.
Do not suppress
Error Detection
Select BCC or CRC error detection.
Configure all stations to use the same type of error checking.
BCC—The serial module sends and accepts messages that end with a BCC byte for error checking. BCC is quicker and easier to
implement, but does not detect as many errors as CRC
CRC—the serial module sends and accepts messages with a 2-byte CRC for error checking. CRC is a more effective error
detection algorithm.
BCC
Enable Duplicate
Detection
Select whether the serial module should detect and ignore duplicate messages.
Enabled
Studio 5000
CompactLogix 5380
MLX, PLC5, SLC, and so on.
DF1 Controller (or device)
Radio
Modem
Radio
Modem
Radio
Modem
MLX, PLC5, SLC, and so on.
IMPORTANT
DF1 and DH-485 protocols use channel 1 only and must be local.
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