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Disclaimer Of Liability
We have checked the contents of this manual against the hardware and software described. However, deviations from the description cannot
be completely ruled out.
RuggedCom shall not be liable for any errors or omissions contained herein or for consequential damages in connection with the furnishing,
performance, or use of this material.
The information given in this document is reviewed regularly and any necessary corrections will be included in subsequent editions. We appreciate
any suggested improvements. We reserve the right to make technical improvements without notice.
Registered Trademarks
ROX™, RuggedBackbone™, RuggedRated™ and eRSTP™ are trademarks of RuggedCom Inc. ROS®, RuggedRouter® and RuggedSwitch®
are registered trademarks of RuggedCom Inc. Other designations in this manual might be trademarks whose use by third parties for their own
purposes would infringe the rights of the owner.
Linux® is the registered trademark of Linus Torvalds in the U.S. and other countries.
The registered trademark Linux® is used pursuant to a sublicense from LMI, the exclusive licensee of Linus Torvalds, owner of the mark on
a world-wide basis.
Third Party Copyrights
RuggedCom recognizes the following third party copyrights:
Five (5) years from date of purchase, return to factory. For warranty details, visit www.RuggedCom.com or contact your customer service
representative.
Contacting RuggedCom
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Federal Communications Commission Radio Frequency Interference
Statement
This equipment has been tested and found to comply with the limits for a Class A digital device
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference when the equipment is operated in a commercial environment. This
equipment generates, uses and can radiate radio frequency energy and, if not installed and used in
accordance with the instruction manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause harmful interference in which
case the user will be required to correct the interference at his own expense.
Caution: Service
This product contains no user-serviceable parts. Attempted service by unauthorized
personnel shall render all warranties null and void.
Changes or modifications not expressly approved by RuggedCom Inc. could invalidate
specifications, test results, and agency approvals, and void the user’s authority to
operate the equipment.
Should this device require service, refer to Appendix A, Warranty in this guide.
Caution: Physical Access
This product should be installed in a restricted access location where access can only
be gained by service personnel or users who have been instructed about the reasons
for the restrictions applied to the location and about any precautions that shall be taken;
and access is through the use of a tool or lock and key, or other means of security,
and is controlled by the authority responsible for the location.
The RuggedSwitch™ RS900G is an industrially hardened, fully managed Ethernet switch
providing dual fiber optical Gigabit Ethernet ports and eight Fast Ethernet copper ports. Designed
to operate reliably in harsh industrial environments, the RS900G provides a high level of immunity
to electromagnetic interference and heavy electrical surges typical of environments found in
electric utility substations, factory floors or in curb side traffic control cabinets. An operating
temperature range of -40°C to +85°C coupled with hazardous location certification, a powder
coated aluminum enclosure and optional conformal coating allows the RS900G to be placed in
almost any location.
The embedded Rugged Operating System (ROS™) provides advanced networking features such
as Enhanced Rapid Spanning Tree (eRSTP™), Port Rate Limiting and a full array of intelligent
functionality for high network availability and manageability.
The RS900G HI power supply inputs are connected as follows:
1.+/L should be connected to AC (Hot)
2.-/N should be connected to AC (Neutral)
3.Surge Ground is connected to the Chassis Ground via a braided cable or other appropriate
grounding wire. Surge Ground is used as the ground conductor for all surge and transient
suppression circuitry internal to the RS900G unit.
4.Chassis Ground should be connected to the AC Ground terminal
1.Equipment must be installed according to the applicable country wiring codes.
2.Surge Ground MUST be disconnected from the Chassis Ground during HIPOT
(dielectric strength) testing.
3.All line-to-ground transient energy is shunted to the Surge Ground terminal. In
cases where users require the inputs to be isolated from ground, remove the
ground braid between Surge and Chassis Ground. Note that all line-to-ground
transient protection circuitry will be disabled.
The RS900G low voltage DC power supply features reverse polarity protection and dual
independent inputs. This feature allows the connection of two DC sources with the same nominal
voltage to provide redundant power supply inputs. The DC source must be connected to the DC
inputs according to the polarity markings on the unit.
1.Equipment must be installed according to the applicable country wiring codes.
2.Surge Ground should be connected to Chassis Ground via a braided cable or
other appropriate ground wire.
3.Chassis Ground must be connected to the protective earth.
4.All line-to-ground transient energy is shunted to the Surge Ground terminal. In
cases where users require the DC inputs to be isolated from ground, remove the
ground braid between Surge and Chassis Ground. Note that all line-to-ground
transient protection circuitry will be disabled.
Units which are to be “HIPOT” tested in the field must have the braided ground cable disconnected
(see Figure 2.4, “HIPOT (Dielectric Strength) Testing”) during the HIPOT test. This is required in
order to prevent the transient/surge suppression circuitry, which is connected to Surge Ground,
from being activated during the HIPOT test.
Figure 2.4. HIPOT (Dielectric Strength) Testing
2.4. Failsafe Output Wiring and Specifications
The “Failsafe” output relay is provided to signal critical error conditions that may occur on the
RS900G. The contacts are energized upon power up of the unit and remain energized until an
alarm condition or power loss occurs.
Figure 2.5. Failsafe Output Relay
2.5. RS232 Port Wiring
The RS232 port is used for configuring the unit. A straight-through serial cable with a DB-9
connector is required. There is no need to crossover the Transmit and Receive signals from the
PC side since this has been done internally as shown in the figure below.
The RS900G has several 10/100BaseTX ports that allow connection to standard CAT-5 UTP cable
with RJ45 male connectors. The RJ45 receptacles are directly connected to the chassis ground
on the unit and can accept shielded CAT-5 cables. If shielded cables are used, care must be
taken to ensure the shielded cables do not form a ground loop via the shield wire and the RJ45
receptacles at either end.
Figure 2.7. RJ45 Port Connector
RJ45 Pin10/100Base-Tx10/100/1000Base-Tx
1RX+A+
2RX-A3TX+B+
4NCC+
5NCC6TX-B7NCD+
8NCD-
Table 2.2. RJ45 Ethernet Pin Assignment
RuggedCom does not recommend the use of CAT-5 cabling of any length for critical
real-time substation automation applications. However, transient suppression circuitry
is present on all copper ports to protect against damage from electrical transients and
to ensure IEC 61850-3 and IEEE 1613 Class 1 conformance. This means that during
the transient event communications errors or interruptions may occur but recovery is
automatic.
RuggedCom also does not recommended to use these ports to interface to field
devices across distances which could produce high levels of ground potential rise, (i.e.
greater than 2500V) during line to ground fault conditions.
For maximum flexibility, RuggedCom Inc. offers a number of different transceiver choices for
Gigabit fiber optic communications. The following table details fiber optic specifications based on
the order code/transceiver selected at time of ordering.
RuggedCom warrants this product for a period of five (5) years from the date of purchase. This
product contains no user-serviceable parts. Attempted service by unauthorized personnel shall
render all warranties null and void. For warranty details, visit www.RuggedCom.com or contact
your customer service representative.
Should this product require service, contact the factory at: