Rockwell Automation Publication 2080-UM002N-EN-E - November 2022
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Appendix G Connect to Networks using DF1
DF1 Radio Modem Communication Diagnostics
Communication diagnostics is available while connected to the controller by clicking the
Diagnose communication status button.
explains information regarding the
diagnostic counter data displayed.
Control Line
No Handshake
This parameter defines the mode in which the driver operates. Choose a method appropriate for your
system’s configuration:
• If you are not using a modem, choose NO HANDSHAKE.
• Half-Duplex without Continuous Carrier (RTS/CTS)
• Half-Duplex with DCD Handshaking
See
Modem Control Line Operation on page 338
for descriptions of the control line operation settings.
Error Detection
CRC
With this selection, you choose the how the controller checks the accuracy of each DF1 packet transmission.
BCC:
This algorithm provides a medium level of data security. It cannot detect:
– transposition of bytes during transmission of a packet
– the insertion or deletion of data values of zero within a packet
CRC:
This algorithm provides a higher level of data security.
Select an error detection method that all devices in your configuration can use.
When possible, choose CRC.
RTS Off Delay
0
Defines the amount of time, in 20 millisecond increments, that elapses between the end of the message
transmission and the de-assertion of the RTS signal. This time delay is a buffer to make sure that the modem
has transmitted the message, but should normally be left at zero. See
RTS Send Delay and RTS Off Delay on
for further guidelines for setting this parameter.
RTS On Delay
0
Defines the amount of time, in 20 millisecond increments, that elapses between the assertion of the RTS
signal and the beginning of the message transmission. This time allows the modem to prepare to transmit
the message. The Clear-to-Send (CTS) signal must be high for transmission to occur. See
for further guidelines for setting this parameter.
Pre-Transmit Delay
0
Defines the amount of time, in 1 millisecond increments, that elapses between when the controller has a
message to send and when it asserts the RTS signal (if handshaking is selected) or begins transmitting (if no
handshaking is selected).
Table 98 - Configure a Micro800 controller for DF1 Radio Modem communication (Continued)
Parameter
Default
Selections
Table 99 - DF1 Radio Modem Communication Diagnostics Parameters
Status Field
Definition
Packets Sent
The total number of DF1 messages sent by the controller.
Packets Received
The number of messages received with no errors.
No Memory for Receiving
The number of times the controller could not receive a message because it did not
have available memory.
Undelivered Packets
The number of messages that were sent by the controller but not acknowledged by
the destination device.
Duplicate Received
The number of times the controller received a message packet identical to the
previous message packet.
Bad Characters Received
The number of data characters received with transmission errors by the controller.
1. Click Diagnose communication status to bring
up the DF1 Radio Modem diagnostics.
2. See
for details concerning the DF1
Radio Modem Communication Diagnostics
screen.