Rockwell Automation 1784-U2DN USB-to-DeviceNet Cable - Manual (Page 8)

8 USB-to-DeviceNet Cable
Rockwell Automation Publication 1784-IN046D-EN-P - April 2011
Change the Data Rate
The 1784-U2DN cable can automatically detect the data rate being used on an
active DeviceNet network. To use this feature, set the data rate (DR) switch to
Auto. If the cable does not detect any network traffic for a period of 12 seconds
after it is plugged into the USB port, it will set itself to a fallback data rate. The
factory-default fallback data rate is 125 Kbps.
You can change the fallback data rate either manually or with RSNetWorx for
DeviceNet software.
Manually Set the Data Rate
1. Unplug the cable from the USB port.
2. Set the rotary address switches to 90 for 125 Kbps, 91 for 250 Kbps, or
92 for 500 Kbps.
3. Plug the cable into the USB port and wait for the cable to finish
powering up.
4. Unplug the cable from the USB port.
5. Set the rotary address switches to a valid address (0...63).
6. Plug the cable into the USB port.
TIP Manually selecting 125 Kbps and using the fallback data rate lets
the cable communicate with devices on a network that does not
have active traffic (for example, a network consisting of slaves
and no master) for node commissioning.