BusWorks
®
900EN-S005 Ethernet Switch User’s Manual Ethernet I/O
__________________________________________________________________
_______________________________________________________________________________________
Acromag, Inc. Tel:248-624-1541 Fax:248-624-9234 Email:
http://www.acromag.com
10
9
Connect Earth Ground as shown in the connection drawings above.
Note the additional connection to earth ground at the GND terminal
(recommended).
The plastic module housing does not require earth ground.
Check your wiring and refer to this table if you have trouble using this switch.
SYMPTOM
POSSIBLE CAUSE
POSSIBLE FIX
Cannot
communicate.
Is Power ON at the
module?
Check power. Do any LED’s
light?
Module Does not
recognize new DIP
switch settings.
Have you reset the
module since
making changes?
Push Reset Button or cycle
power.
Have you enabled
the DIP switches?
DIP switch S2-1 must be
OFF to enable DIP switches.
Module Does not
recognize new
EEPROM register
Have you reset the
module since writing
registers?
Push Reset button or cycle
power.
configuration.
Have you enabled
EEPROM interface
DIP Switch S2-1 must be ON
to enable EEPROM. DIP
Switch S2-3 must be OFF.
Signature Byte
Registers Have
Wrong Value.
Registers 0,1 must be set to
5599H, respectively.
Many
Communication
Errors.
Is cable segment
longer than 100M?
Maximum distance between
two nodes is limited to 100
meters using approved
cable. Good practice further
limits segment length to 80%
or 80 meters.
Network cable may
be picking up noise.
Try using Category 5E
shielded cable and shielded
RJ45 connectors.
Communication
appears temporarily
lost after hot-
swapping port
connections.
Problem –
Sometimes if port
connections are hot-
swapped, the unit
may wait until the
aging period expires
(5 minute default)
before it recognizes
the new connection.
You may wait 5 minutes or
simply reset the module after
hot-swapping port
connections. Optionally, in
EEPROM Mode you can
enable fast aging (register 3
bit 1), or enable fast aging on
a change in link status
(recommended, reg. 2 Bit 0).
Erroneous reads In
SPI Slave Mode
Common - Poor
quality parallel port
signals.
Check cable. Reduce cable
length. Try another PC.
Earth Ground
Warning:
To comply with
safety and performance
standards, use shielded cable
and connect earth ground as
noted. Failure to use good
wiring and grounding practices
may be unsafe and hurt
performance.
TROUBLE-
SHOOTING
Diagnostics Table
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 module with a
known good unit. Acromag’s
Application Engineers can
provide further technical
assistance if required.
Complete repair services are
also available from Acromag.
Note:
The SPI Mode and
interface are reserved for
factory use only and operation
in this mode is not guaranteed
by Acromag.
