INDUSTRIAL DATA COMMUNICATIONS 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.
Product User Guide FCC Information Appropriate FCC info DATA-LINC GROUP PN 161-xxxxx-001A
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.
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.
DATA-LINC GROUPp LCM100 User’s Guide Communication Failure Carrier Detect Off RS-232C Input Failure Power Indicator Off Modulator/Oscillator Failure Receiver Circuitry Failure Signal Modulator Coupler Oscillator Failure Failure Cable/CNX Failure Circuit Breaker Open Fuse Blows Power Breaker 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 o
DATA-LINC GROUPp LCM100 User’s Guide LCM100 Technical Specifications Power requirements Data Rate 120 volts at +/- 10%, 50-60 Hz, 4.5 watts. Power is on when module(s) are connected Up to 9600 baud Data Formats Any serial asynchronous format up to 9600 baud Operation Full Duplex Receive Sensitivity 20 millivolts Transmit Level 250mW into 3 ohms Interface EIA RS-232C Interface Standard Mating Connectors FSK Carrier Female, DB-25P Highband: Space 150 kHz, Mark, 156.
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.
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 9-19 20 Description Pins 9-19 are unused, open. 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.
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.
DATA-LINC GROUPp LCM100 User’s Guide Appendix C System Block Diagram Data Communications Equipment Data Terminal Equipment RS-232C Interface RS-232C Interface LCM100-1 LCM100-2 DB-25P Connectors w/Cable Data Out Pin 2 DB-25P Connectors w/Cable Data In Frequency Modulator Lowband Oscillator Lowband Receiver/ Demodulator AC Power Lines Data Out Pin 2 Data In Carrier Detect Circuit Highband Oscillator Data In Pin 3 Pin 8 Pin 7 Data Out Carrier Detect Output Highband Receiver/ Demodulator
