Rockwell Automation 2708-DH5B2L_DH5B4L Attended Workstation - Manual (Page 61)

Chapter 5
Configuration Menus
5–20
The following is a cable verification procedure:
Place the workstation at the Master’s location into RS485 Block Transmit
test mode (Diagnostic Test C).
As you install each workstation, place it into RS485 Block Receive mode
(diagnostic test B). If the receiving workstation does not show the test block,
it is indicative of a cable fault. Correct any cable faults before proceeding.
Always work your way out from the Master workstation, installing
workstations further and further away as you progress.
After all workstations on the network are in place, verify that every one is
receiving the test message.
Place the Master workstation into RS485 Block Receive test mode
(diagnostic test B), and place the workstation at the most remote position in
the network into RS485 Block Transmit mode (diagnostic test C). Once
again, verify that all workstations are receiving the test block. Remember
that only one workstation on the network can ever be in Block Transmit
mode.
Pressing <EXIT> will exit the Block Transmit mode.
Note: This test must never be performed on a network operating in an actual
application. All other network activity must cease while this test is being run.
D–RS232 Block Receive
This test, and its counterpart, the RS232 Block Transmit must be used only
with asynchronous modem lines. It is used for testing the Concentrator to
Submaster connection ONLY.
When this test is enabled, the following appears on the display:
Rx=nnnnn ERRS=nnnnn –––contents of a block–––––
The Rx indicates the number of blocks received by this workstation, the
ERRS indicates the number of errors encountered.
If the Rx count does not change on the display, then the cable is probably not
connected, is shorted, wired incorrectly or has a break. If the Rx Error count
is more than 1% of the received blocks (Rx count), then there are cabling
problems present which must be corrected for proper operation of the
Concentrator to Submaster link. See Chapter 2.
This test is terminated by pressing <EXIT>.
Menu 6: Diagnostics
Menu Parameters (cont’d)