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All information contained within this publication is, to the best of our knowledge, complete and
accurate at the time of publication. Rice Lake Weighing Systems reserves the right to make
changes to the technology, features, specifications and design of the equipment without notice.
The most current version of this publication, software, firmware and all other product
updates can be found on our website:
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Contents
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Course descriptions and dates can be viewed at www.ricelake.com/training
or obtained by calling 715-234-9171 and asking for the training department.
Rice Lake continually offers web-based video training on a growing selection
of product-related topics at no cost. Visit www.ricelake.com/webinars
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1.0Introduction
DANGER
WARNING
CAUTION
IMPORTANT
WARNING
This manual is intended for use by service technicians responsible for installing the SCT-1000 Ethernet and the
SCT-2200 Wi-Fi as network communications for SCT-2200 indicators.
Manuals and additional resources are available from the Rice Lake Weighing Systems website at
Warranty information can be found on the website at www.ricelake.com/warranties
1.1Safety
Safety Signal Definitions:
Indicates an imminently hazardous situation that, if not avoided, will result in death or serious injury. Includes
hazards that are exposed when guards are removed.
Indicates a potentially hazardous situation that, if not avoided, could result in serious injury or death. Includes
hazards that are exposed when guards are removed.
Indicates a potentially hazardous situation that, if not avoided, could result in minor or moderate injury.
Indicates information about procedures that, if not observed, could result in damage to equipment or corruption
to and loss of data.
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Introduction
General Safety
Do not operate or work on this equipment unless this manual has been read and all instructions are understood.
Failure to follow the instructions or heed the warnings could result in injury or death. Contact any Rice Lake
Weighing Systems dealer for replacement manuals.
Failure to heed could result in serious injury or death.
Electric shock hazard!
The units have no power switch, to completely remove power from the units, disconnect the power source.
Always disconnect from main power before performing any work on the device.
Do not allow minors (children) or inexperienced persons to operate this unit.
Do not operate without all shields and guards in place.
Do not use for purposes other then weighing applications.
Do not place fingers into slots or possible pinch points.
Do not use this product if any of the components are cracked.
Do not make alterations or modifications to the unit.
Do not remove or obscure warning labels.
Do not use near water, avoid contact with excessive moisture.
The SCT-1000 Ethernet module and SCT-2200 Wi-Fi module add the following communication functions to the SCT-2200
indicator, See Section 5.1 on page 20 for full specifications:
Device NameFunctions
SCT-1000 Ethernet1 RS-485 bidirectional port for connection to SCT-2200
1 RS-232 bidirectional port for connection to SCT-2200
1 Ethernet port for connection to PC/PLC
Allows the following conversions:
• RS-232 ↔ Ethernet
• RS-485 ↔ Ethernet
• RS-232 ↔ RS-485
• MODBUS TCP ↔ Ethernet
SCT-2200 Wi-Fi2 RS-485 bidirectional ports for connection to SCT-2200
1 RS-232 bidirectional port for connection to SCT-2200
1 LAN port
1 WAN port
1 SMA port for Wi-Fi
Allows the following conversions:
• RS-485 ↔ Wi-Fi
• RS-485 ↔ Ethernet
Table 1-1. Device Functions
LED Definitions
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Figure 1-1. Module LEDs
GreenYellow
SET NUMBER OF BLINKSAt startup: indicates the module is ON
When module is on: indicates the presence of serial activities
OFFNetwork cable not connected
FIXEDDevice connected to network N/A
CONTINUOUS BLINKINGN/APresence of network activity
Table 1-2. LED Definitions
2.0Setup
Note
2.1Module Connection to SCT-2200 Transmitters
2.1.1RS-485 Connection
It is possible to connect up to 32 devices on the same RS-485 line.
TransmitterSCT-2200-1SCT-2200-2......SCT-2200-n
Figure 2-1. Electrical Diagram of RS-485 Connection
Setup
• Use an STP (Shield Twisted Pair) cable to make the connection. STP Cable - 2x24 AWG twisted and shielded pair(s).
Single shielding for each pair is provided through foil wrap and total shielding through conduit.
• Using the appropriate cable for RS-485 connections, the maximum line length is about 1200 meters.
• As cable length increases, the cable capacity ( near 50pF/m) becomes a major factor in power consumption and
increases as speed increases.
• This means that the maximum distance cannot be covered with the maximum possible speed. For approximate values,
consult the table below:
Baud RateTotal Capacity of Cable (pF)
1200400000
2400200000
4800100000
960050000
1920025000
3840012000
576008000
1152004000
Table 2-1. Baud Rate and Cable Capacity
When the SCT-1000 Ethernet is set up to use Modbus TCP, it is only capable of communicating with one SCT2200.
Making an RS-485 Connection
1.Verify that the grounding satisfies the SCT-2200 requirements. See the SCT-2200 Operating Manual (PN 183522).
Connect all of the digital and analog masses and power circuits to the grounding bar, and connect the grounding bar to
the earth ground.
2.The shielding can be connected to a single point in the network (as shown in Figure 2-1) or at both ends, however, it is
important that all the devices have the same potential in order to avoid forming ground rings.
3.Connect two termination resistances equal to the characteristic impedance of the cable (typically 120 Ω, see
Figure 2-1 on page 3). Only connect the two devices at the two ends of the ring connection (Example: indicator and
last device). The terminal resistance is not supplied with the ports of the indicator.
4.The difference of potential between the A(+) and B(-) terminals in rest conditions (Example: in set-up phase) must be
at least 0.2 V.
5.To create a resistive divider which maintains this difference of potential when all the transmitters are disabled, insert in
the RS-485 port where the termination resistances are located the polarization or fail-safe resistances (R
FS
in
Figure 2-1 on page 3). The value of these resistances is between 390 Ω and 2.2 kΩ.
The value of these resistances must be greater than the value calculable through the formula below:
R
R
FS
= The power supply voltage of the line
V
dc
R
= The overall resistance to the A(+) and B(-) between the lines, supplied by the parallel of the two termination
eq
-------2
eq
=
V
dc
---------
0.2
1–
resistances and all the input resistances of the devices connected to the bus.
Example:
Assume that a connection has 120 Ω as termination resistance and 32 connected devices, each with an input
impedance of 12 kΩ. The V
numbers into the equation, R
power supply is 5 V, and calculate Req to be about 52 Ω. After plugging these
dc
must be at least equal to 624 Ω.
FS
If connecting with non-RLWS devices:
• Be aware that lines may be marked differently. Generally the A/B markings correspond to the +/- and HI/LO markings,
but this is not always the case. Therefore if the device does not function properly, try inverting the connections.
2.2Electrical Diagrams
2.2.1SCT-1000 Ethernet Module
Once the SCT-1000 Ethernet module is integrated into the SCT-2200 indicators, it can be connected to an external Ethernet
cabling using an external RJ-45 connector. We recommend using a network surge suppressor (PN 72682) wired through a cord
grip with the RJ-45 socket left outside of the enclosure.
The SCT-2200 Wi-Fi can be configured through a web browser using eitherWi-Fi capability or the external Ethernet cabling with
an external RJ-45 connector. We recommend using a network surge suppressor (PN 72682) wired through a cord grip with the
RJ-45 socket left outside of the enclosure.
Figure 2-3. SCT-2200 Wi-Fi Electrical Diagram
2.3Configuring PC to communicate with Module
2.3.1Setting the IP address for Ethernet connections
Both the SCT-2200 Wi-Fi and the SCT-1000 Ethernet module have Ethernet capability and will be automatically recognized
when hardwired into a network.
• The default IP address of the SCT-2200 Wi-Fi is 192.168.16.254.
• The default IP address of the SCT-1000 Ethernet is 192.168.16.205.
The computer Ethernet port must belong to the same class of network for the module to be recognized on the network (in this
case, the network must have an IP address of the type 192.168.16.xxx). To modify the IP address in Windows 10 follow these
steps:
1.From the Start menu, select Settings. See step 1 in Figure 2-4.
2.In Windows Settings, select Network and Internet. See step 2 in Figure 2-4.
3.In Network and Internet, select Ethernet, then select Change Adapter Options. See step 3 in Figure 2-4..
1.
4.In the Network Connections window, double click Ethernet. See Figure 2-5.