Rockwell Automation 1788 NetLinx Media Checker Users Manual - Manual (Page 28)

28 Measuring Cable Length (LENGTH)
1788-UM002A-US-P – April 2000
4. Press E to check the cable selection.
The MediaChecker displays the cable selection for a
few seconds and then starts the test. If the cable
selection is not correct, refer to “Preparing the
MediaChecker for Use” on page 8 to select a new
cable setting. “CAL” appears in the second line of the
display if a cable calibration has been performed for
the selected cable type.
Important: When a length measurement flashes on the
display, the length of the cable exceeds
either the maximum allowed by the standard
(for DeviceNet, DH+/RIO, and Ethernet
cables) or the MediaChecker’s range of
measurement (for ControlNet cables).
The information displayed depends on the type of cable
selected.
For a DeviceNet cable with no failures, the display shows
the following:
aan11f.eps
The MediaChecker cannot determine the length of a
coaxial cable terminated with a resistance. Only the total
resistance of the wire and the terminator is displayed. An
unterminated coaxial cable 445 ft long gives the following
result:
aan12f.e