BusWorks® Model 989EN U
ser’s Manual Modbus TCP/IP Digital I/O & Counters
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Acromag, Inc. Tel:248-295-0880 Fax:248-624-9234 Email:
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Refer to Acromag Application Note 8500-734 for help in setting up network
communication with your unit (see CDROM shipped with unit or down-load it
from
). This document gives details for changing your
PC’s TCP/IP configuration in order to communicate with hardware similar to
your unit (see TCP/IP Properties of Network Configuration in Windows).
If you have carefully followed this procedure and you still cannot browse your
unit, you may have the web browser of your laptop or PC setup to use a
proxy server when browsing the web. If you are using Internet Explorer,
refer to the “Tools” pull-down menu, select “Internet options…”, click the
“Connections” tab, then click the “LAN Settings” button. Locate the Proxy
server information and uncheck the box next to the statement “Use a proxy
server for your LAN”. Then click [OK] to return to the “Connections” screen,
and click [OK] again to save your settings. You should now be able to use
Internet Explorer to browse the unit as required. However, to later restore
your PC’s connection to your company network, you may have to re-enable
the use of a proxy server for your LAN.
There is limited built-in error checking to prevent you from writing invalid
values to a configuration register. If you inadvertently write an invalid value
to an internal register, operation may become unpredictable under certain
conditions. If resetting the unit fails to restore order, then to regain control of
the unit, the unit can either be re-downloaded at the factory, or you can try
restoring its initial configuration by following this procedure:
Procedure For Restoring any 989EN Unit to its Initial Configuration
IMPORTANT:
Before reading on, please follow the default mode activation
procedure located on page 3. If you are still unable to communicate to the
module, please continue reading.
WARNING:
Use this only as a last resort, as this procedure will reset
everything to its default state--all holding registers, and network settings (the
permanently coded MAC ID does not change).
1. With unit power OFF, press and hold the front-panel DEFAULT push-
button.
2. While still pressing the push-button switch in, apply power.
3. Note that the green RUN LED will turn ON. Continue to press the push-
button for about 5 seconds until the green RUN LED turns OFF.
Release the DFT push-button at this point and the RUN LED will blink
for 1-10 seconds as the unit acquires its address, then remains ON for
normal operation (normal boot). At this point, the unit is not in the
default communication mode, but all registers are reset back to their
default factory state.
4. If the green RUN LED never turned OFF while you held the DFT push-
button during power-up, then reinitializing the unit has failed and you
should try it again. This time, make sure that the DFT push-button
switch is completely depressed and held until RUN turns OFF while
powering the unit.
TROUBLE-
SHOOTING
Diagnostics Table
…continued
If your problem still exists after
checking your wiring and
reviewing this information, or if
other evidence points to
another problem with the unit,
an effective and convenient
fault diagnosis method is to
exchange the unit with a
known good u
nit. Acromag’s
Application Engineers can
provide further technical
assistance if required.
Complete repair services are
also available from Acromag.
Getting Out Of Trouble
Trouble Browsing Your
Unit?
So, your 989EN has
apparently “gone wild”, and
power cycling the unit did not
correct your problem, then
follow this procedure to restore
it to its initial configuration and
regain control.
