Plcc Modem

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Power Line Carrier Communication Embedded Module User Guide Version 0.1

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Prodigy Labs Pvt Ltd

Table of Contents1 Introduction............................................................................................................................................ 3 1-1 Kit Components.............................................................................................................................. 4 1-2 Minimum Requirements ................................................................................................................ 4 2 PLCC Board Overview.......................................................................................................................... 4 2-1 PLCC Board Key Features..............................................................................................................5 2-2 PLCC Board Components...............................................................................................................6 2-4 PLCC Board Dimensions................................................................................................................7 2-5 Block Diagram................................................................................................................................ 7 3 PLCC Board Module............................................................................................................................. 8 3-1 Communication Interface................................................................................................................8 3-2 Automatic Meter Reading (AMR) Demo Interface........................................................................ 8 3-3 Street Light Application Demo Interface (Optional).................................................................... 10 4 About PLCC Transceivers................................................................................................................... 11 4-2 Reliable Data Communication...................................................................................................... 12 4-4 Summary....................................................................................................................................... 12 5 Automatic Meter Reading (AMR) Demo............................................................................................ 13 5-1 Determining the Concentrator-Node devices................................................................................13 5-2 Setting Up the User Interface........................................................................................................13 5-3 Running the AMR Demo.............................................................................................................. 14 6 Street Light Application Demo............................................................................................................ 15 6-1 Determining the Master-Slave devices......................................................................................... 15 6-2 Setting Up the Demo Interface......................................................................................................15 6-3 Running the Street Light Application Demo................................................................................ 17 7 Revision History.................................................................................................................................. 18 8 About Prodigy Labs Pvt. Ltd. -Bangalore............................................................................................18 9 Change Notice Information..................................................................................................................18

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Prodigy Labs Pvt Ltd

1 Introduction PLCC is a technology which uses power lines as physical media for data transmission. PLCC can offer ano new wires solution because the infrastructure has already been established. PLCCs are used for transmitting data at a rapid speed through a power line in a house, an office, a building, and a factory, etc. Here, the existing alternating current (AC) power wires serve as a transmission medium by which information is relayed from a transmitter or control station to one or more receivers or loads connected downstream from an AC source. Typical applications of PLCC are Street light control, Automatic Meter Reading,HVAC control, Low Speed Data Networks, Signs and Information Display, Fire and Security Alarm etc. The PLCC board developed by Prodigy Labs Pvt. Ltd. robust, low-cost way to communicate over power lines.

Figure 1: PLCC board The Embedded PLCC modem is based on the Differential Code Shift Keying (DCSK) Technology. This technology in Power Line Carrier (PLCC) communication is well known for its high immunity to electrical noise persistent in the power line.The PLCC Modem is in the form of a ready-to-go circuit module, which is capable of transferring data over the power cable at the low voltage end of the power transformer of a 3-phase/ 4-wire distribution network. A pair of Embedded PLCC Modems connected on the power line can provide low speed bi-directional data communication at a baud rate of 9600 bps.

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Prodigy Labs Pvt Ltd

1-1 Kit Components The following table lists the components of the Embedded PLCC modem developed by Prodigy Labs Pvt. Ltd. Bangalore. Hardware Component Embedded PLCC modem Qty 1 Description The Versatile board with highly integrated SoC power line modem which incorporates a high performance DLL and extremely robust PHY layer. This PLCC board is designed for host of applications like Automatic Meter Reading (AMR), Street light control, HVAC control etc. Required for applications that use the COM port of the PC.

RS-232 cable

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Table1: Kit Components 1-2 Minimum Requirements

PC with OS installed like Microsoft XP OS or Linux based OS. At least one free COM port. Hyperterminal like serial communication program.

2 PLCC Board Overview The Embedded PLCC modem developed by Prodigy Labs Pvt. Ltd. provides communication over power lines using CENELEC frequency band (outdoor: 20 kHz to 80 kHz , indoor:95-125 kHz ) and achieves data transfer rates of up to 2.5 kbps (Robust Mode).

Figure 2: MCU on PLCC board

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Prodigy Labs Pvt Ltd

2-1 PLCC Board Key Features The following are some key technical features of the Embedded PLCC modem : Data Rate 2.5Kbps (RM : Robust Mode) 0.625Kbps(ERM : Extremely Robust Mode)

Modulation Differential Code Shift Keying- DCSK Frequency Band CENELEC : 20-80 kHz outdoor), 95-125 kHz(indoor) Bi-directional half-duplex data communication over the mains. Simple serial interface to user's data devices. Built-in on board AC coupling circuit with direct connection to mains. High in-phase and cross-phase reliability. CSMA / CA Channel Access Protocol. Forward short-block soft decoding error correction mechanism and CRC-16 . Selectable TTL and RS232C level serial interface to user's data devices. Built-in carrier generation and detection. Current consumption is as low as 60 mA @Idle, 90 mA @ Rx and 300 mA @ Tx mode. Protocol independent, data transfer transparent to user's data terminals. High noise immunity and reliable data communication.

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Prodigy Labs Pvt Ltd

2-2 PLCC Board Components The following figure highlights some of the key components of the PLCC Board.

2-3 Power Supply The Embedded PLCC modem operates at 5 V. A power supply of 5 V, 1A rating is required and output should be connected to pin 2 (VCC ) of serial interface connector ( CON J2 on PLCC board). For details refer Figure 11 and Table 3.

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Prodigy Labs Pvt Ltd

2-4 PLCC Board Dimensions The following figure shows the dimensions of the Embedded PLCC Board :

100 mm

AC R S 2 3 2

Line Driv er

M ain controlle r

T T L Xformer SMD Programming Con

50 mm

Figure 4: Embedded PLCC Board Dimensions

2-5 Block Diagram A block diagram of the Embedded PLCC Board is provided below.

Main Controller

Figure 5: Embedded PLCC module Block Diagram

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Prodigy Labs Pvt Ltd

3 PLCC Board Module 3-1 Communication Interface The Communication Interface provides serial communication between the Embedded PLCC Board and a PC. The board uses a standard RS-232/UART port for communication with a COM port on a PC. In Case on board RS-232 level translator is not needed a TTL interface is also provided. It can be used with, for example, a PC running a terminal program such as Hyperterminal (for use under Windows) or Minicom (for use under Linux). General communication interafce is as shown in figure 6 below. For details refer Figure 11 and Table 3.

Figure 6: Communication Interface

3-2 Automatic Meter Reading (AMR) Demo Interface Automatic meter reading (AMR), is the technology used for automatic collection of energy consumption, diagnostic, and status data for billing and analysis purposes. AMR system gathers this data and transfer it to central database through networking topology. Embedded PLCC module is a key component of AMR system employed for energy meter data collection. The modules provides bi-directional half-duplex data communication over the mains of any voltage up to 250 V A.C. and for frequency of 50 or 60 Hz. Data communication of the modules is transparent to user's data terminals and is protocol independent; as a result, multiple units can be connected to the mains without affecting the operation of the others. The use of DCSK modulation technique ensures high noise immunity and reliable data communication. There is no hassle of building interface circuits. Interface to user's data devices is a si