Omron Modem LCM100 User Manual

USER GUIDE  
LCM100  
Line Carrier Modem  
It is essential that all instructions contained in the User Guide are followed precisely to ensure proper operation of equipment.  
 
DATA-LINC GROUPp  
LCM100 User’s Guide  
LCM100  
Line Carrier Modem  
Introduction  
In the line carrier system, the hot line supplies current to connected loads and is also used as a  
carrier for data communication between modules. The Data-Linc LCM100 can communicate over  
the same line in a 240 volt single phase system or on any individual phase of a three-phase  
system.  
Note: It will be necessary to have a signal coupler installed to ensure communications over  
different lines of the 240 volt, single phases system.  
In the three-phase power environment, communication will occur freely if both devices are  
connected on the same phase, but cross-phase communication will require line conditioning by  
installation of a signal coupler between phases. As shown in Figure 1 below, two signal couplers  
are sufficient for all cross-plane combinations in a three-phase system. Installation of a signal  
coupler at the power distribution panel is fully described under the line conditioning section of  
this manual.  
Hot  
120V  
signal coupler  
Load  
meter &  
circuit  
neutral  
220V  
breaker  
120V  
Hot  
Load  
Figure 1: Connecting a Signal Coupler, Single Phase System  
The green wire is reference (earth) ground. It serves also as chassis ground and reduces  
equipment susceptibility to RF current, static discharge and interference from fluorescent lamps.  
The LCM100 system is designed to operate with a reference ground located at the power  
distribution panel. Reference ground is usually connected to the copy ground bus or to the  
distribution panel frame.  
When the power cord is connected to a three-wire AC power outlet, the bottom round connector  
serves to ground the chassis, protecting against shock hazard, susceptibility to electro-magnetic  
interference and possible spurious emissions.  
PN 161-09998-001A  
2
 
DATA-LINC GROUPp  
LCM100 User’s Guide  
Note: If a three-to-two-wire adapter is used to connect to a two-wire AC outlet, the ground lead  
of the adapter must be connected to earth ground to complete the ground system. An open  
ground connection may cause a communications defect and/or shock hazard.  
Line conditioners in the form of isolators, regulators and surge protectors may be present in the  
computer system in order to provide clean power, especially on non-dedicated lines. The  
LCM100 has integral surge protection.  
Note: The LCM100 should not be plugged into isolator or surge protector devices as this may  
cause signal degradation. If Detect indicators do not illuminate with both units connected to line  
power, a coupling capacitor may be required for cross-phase communication (see appendix B).  
Initial Operation  
The LCM100 is completely transparent. This means that once the system is correctly installed, it  
will not be apparent to the system. Like a cable, it requires no attention other than a reliable  
connection.  
With the modules connected to their respective equipment as previously described, ensure that  
both module’s, Detect and Power indicators are illuminated. Data transfer will occur in both  
directions as commanded by the interconnected equipment.  
Sometimes a random glitch on power lines will cause erroneous data characters to appear at  
either end of the communications line. This is to be expected, especially during periods when the  
equipment is idle. Error correction procedures appropriate to your computer operating system  
can be taken to remove the spuratic characters.  
Troubleshooting  
The following are methods of eliminating the cause of communication difficulties, which may  
occur with the LCM100.  
Fuses  
Each module has a fuse located internally. Replace only with a fuse of similar rating of ½ amp 3  
AG.  
Troubleshooting Technique  
If communication difficulties are encountered, first check for proper cable connections at the  
power receptacles, and at both RS-232C interface cables. An indication of faulty FSK  
communication between modules is a missing Detect indicator at either module. An indication of  
faulty power line connection is the missing power indicator at either module.  
To isolate a communications problem from the RS-232C interface, simply connect the equipment  
directly, without going through the LCM100 modules. If the problem persists, then the defect  
probably lies within the equipment and not the LCM100.  
To isolate line carrier problems from the power distribution circuits, connect each module’s  
power receptacle into a common power distribution circuit—for example, at the same outlet or  
through an extension cord. If communications occur at one outlet, but not at another, then the  
problem is probably due to lack of coupling between phases.  
Note: The LCM100 does not use the handshake lines; therefore, communication protocol codes  
will possibly need to be implemented in order for the LCM100 to operate effectively.  
PN 161-09998-001A  
3
 
DATA-LINC GROUPp  
LCM100 User’s Guide  
Communication Failure  
Carrier Detect  
Off  
RS-232C Input  
Failure  
Modulator/Oscillator  
Failure  
Power  
Indicator Off Receiver  
Circuitry  
Signal  
Coupler Oscillator  
Failure Failure  
Modulator  
Cable/CNX  
Failure  
Failure  
Circuit Breaker  
Open  
Fuse  
Power Breaker  
Blows Fails  
Open  
Fault Tree Legend  
Rectangle denotes an event which  
results from compensation of fault  
events through the input of an OR gate  
Basic fault event  
OR gate denotes that an output event  
occurs if any one or more of the input  
events occur.  
Figure 2: Fault Tree  
PN 161-09998-001A  
4
 
DATA-LINC GROUPp  
LCM100 User’s Guide  
LCM100 Technical Specifications  
Power requirements  
120 volts at +/- 10%, 50-60 Hz, 4.5 watts. Power is on when  
module(s) are connected  
Data Rate  
Up to 9600 baud  
Data Formats  
Operation  
Any serial asynchronous format up to 9600 baud  
Full Duplex  
Receive Sensitivity  
Transmit Level  
Interface  
20 millivolts  
250mW into 3 ohms  
EIA RS-232C Interface Standard  
Female, DB-25P  
Mating Connectors  
FSK Carrier  
Highband: Space 150 kHz, Mark, 156.5 kHz  
Lowband: Space 100 kHz, Mark, 106.5 kHz  
Bandwidth: 10 kHz  
Indicators  
Power: Red LED indicates power on  
Carrier Detect: Green LED indicates carrier signal is being  
received over power line from other module  
Operating Temperature: 32o to 158 o F (0 to 70 o C)  
Storage: -40to 185 F (-40o to 85 C)  
Environment  
Humidity: Up to 90% (non-condensing)  
7.25” x 4.85” x 2.55” (184mm x 123mm x 64mm)  
Dimensions  
Technical Support  
Data-Linc Group maintains a fully trained staff of service personnel who are capable of providing  
complete product assistance. They can provide you with technical, application and  
troubleshooting, spare parts and warranty assistance. Our technical staff are based in Redmond,  
Washington USA and may be reached at 425.882.2206 or email [email protected]  
Product Warranty  
Data-Linc Group warrants equipment of its own manufacture to be free from defects in material  
and workmanship for one year from date of shipment to original user. Data-Linc Group will  
replace or repair, at our option, any part found to be defective. Buyer must return any part  
claimed defective to Data-Linc Group, transportation prepaid.  
Return Material Authorization  
If a part needs to be sent to the factory for repair, contact Data-Linc Group’s corporate office and  
request a Return Material Authorization (RMA) number. The RMA number identifies the part and  
the owner and must be included with the part when shipped to the factory.  
Contact Information  
Corporate Office  
Data-Linc Group  
3535 Factoria Blvd. SE  
Suite 100  
Bellevue, WA 98006  
Telephone: 425.882.2206  
Fax: 425.867.0865  
PN 161-09998-001A  
5
 
DATA-LINC GROUPp  
LCM100 User’s Guide  
Appendix A  
RS-232 Connector Pin Assignments  
Both modules of the LCM100 have female DB-25 connectors which can be directly connected to  
DTE and DCE equipment. All output levels are a minimum of +6 volts when active and a  
maximum of –6 volts when inactive, measured in a 3k ohm load. Inputs will sink 10Ma and have  
a typical turn-on threshold of +1.25 volts and a turn-off threshold of +0.8 volts.  
J2  
Pin Description  
1
Ground  
In the RS-232C environment, this line provides a safety frame ground for  
RS-232 equipment.  
2
3
4
Transmit Data (Output)  
This line transfers data to the RS-232C device.  
Receive Data (Input)  
This line accepts data input from the RS-232C device.  
Request to Send  
Request to send output; indicates that the terminal is ready to transmit data.  
This line is enabled, pulled up to +12 volts through a 4.7K ohm resistor.  
Clear to Send  
Clear to Send input; acknowledges that the terminal may begin  
transmission. This line is enabled, pulled up to +12 volts through a 4.7K ohm  
resistor.  
5
6
Data Set Ready  
Data Set Ready input; acknowledges that the remote device is on and  
operational. This line is enabled, pulled up to +12 volts through a 4.7K ohm  
resistor.  
7
8
Signal Ground  
This line provides a common signal connection.  
Carrier2 Detect (Output)  
This line is a high level (+12 VDC) when carrier is detected, and a low level  
(-12 VDC) when carrier is not detected.  
PN 161-09998-001A  
6
 
DATA-LINC GROUPp  
LCM100 User’s Guide  
Connector J2 (Female)  
Please note that male pin numbering is a mirror image of the female connector depicted below:  
13 12 11 10  
9
8
7
6
5
4
3
2
1
25 24 23 22 21 20 19 18 17 16 15 14  
Figure 3: DB-25P J2 Connector Pins  
J2  
Pin Description  
9-19 Pins 9-19 are unused, open.  
20  
Data Terminal Ready  
Data Terminal Ready output; indicates that the terminal is on and  
operational. This line is enabled, pulled up to +12 volts through a 4.7K ohm  
resistor.  
Notes  
1. On the LCM100-1 module pin 8 is not carried at the connector through P3 because most  
computers provide this signal. Pin 8 may be carried to the connector, if desired.  
2. On the LM100-2 module, the carrier detect signal is available at the connector because the  
interconnected equipment is receiving a signal. Pin 8 may be disconnected at P3, if desired.  
PN 161-09998-001A  
7
 
DATA-LINC GROUPp  
LCM100 User’s Guide  
Appendix B  
Line Conditioning  
In some industrial installations, power lines must be conditioned to prevent the FSK signal from  
being shunted by distributed capacitance possibly associated with other loads connected to the  
line. Motors and transformers, for example, may have very high distributed capacitance.  
Adequate communication in such circumstances may require: 1) installation of signal couplers at  
the power distribution panel to provide a low impedance path between different hot lines; 2)  
isolation of noisy equipment or equipment that presents a low impedance to high frequency  
signals, such as some power line filters commonly used with computer equipment.  
Signal Couplers  
One signal coupler is sufficient for all cross-phase communications in a signal phase system.  
See Figure 4 below:  
DTE  
DCE  
FSK  
A Phase  
B Phase  
Signal  
Coupler  
LCM100-1  
RS-232C  
Signal  
Coupler  
C Phase  
Neutral  
FSK  
LCM100-2  
RS-232C  
Figure 4: Signal Coupler in Three Phase Systems  
PN 161-09998-001A  
8
 
DATA-LINC GROUPp  
LCM100 User’s Guide  
Appendix C  
System Block Diagram  
Data Communications  
Data Terminal  
Equipment  
Equipment  
RS-232C  
Interface  
RS-232C  
Interface  
LCM100-1  
LCM100-2  
DB-25P  
Connectors  
w/Cable  
DB-25P  
Connectors  
w/Cable  
Frequency  
Modulator  
Lowband  
Receiver/  
Demodulator  
Data  
Out  
Data  
In  
Data  
In  
Data  
Out  
Pin 2  
Pin 2  
Carrier  
Detect  
Circuit  
Lowband  
Oscillator  
AC Power  
Lines  
Highband  
Oscillator  
Highband  
Receiver/  
Data  
In  
Data  
Pin 3  
Pin 8  
Out  
Demodulator  
Data  
Out  
Frequency  
Modulator  
Pin 3  
Pin 7  
Carrier  
Carrier  
Detect  
Circuit  
Signal Ground  
Detect  
Output  
Pin 7  
Signal Ground  
PN 161-09998-001A  
9
 

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