KR20010082875A - PCPM : Powerline Communication Protocol for Microcontroller - Google Patents

Abstract

PURPOSE: A power line communication protocol is provided to decrease a transmission efficiency and a data processing time by maximally summarizing information needed by each node of a network and inserting summarized information into a small packet to transmit information. CONSTITUTION: A specific byte of a transmission packet is designated as a packet characteristic byte in a communication protocol of a communication system using a power line, a high frequency, an infrared ray, and a twisted pair as a transmission medium. A characteristic of a current transmitted packet is defined by two bits. A response to the current transmitted packet is defined by one bit. It is defined whether the content of an address field of the current transmitted packet is a transmission address or a receipt address by one bit. A receipt address group is defined by residual four bits for establishing a data link between nodes.

Description

Powerline Communication Protocol {PCPM: Powerline Communication Protocol for Microcontroller}

The present invention relates to a data packet configuration method and transmission method in data communication using a power line, and more particularly, to an effective communication protocol configuration when a narrow band power line communication technology is applied to a home control network.

Data communication technology using the power line from the distributor of the telephone pole,

① Technology to implement high speed communication network (Mega bps) between distributor and base station

② It is divided into low speed network (Kilo bps) technology for home networking between transformers and terminal devices such as houses, buildings, and factories.

These home networking are divided into home data networking and home control networking. Home data networking,

Data movement between indoor PC peripherals and consumer electronics

File sharing between PCs

-Share your printer

Internet access sharing

To implement

Home control networking;

Remote control of indoor electrical and electronic devices

Operation and status of indoor electrical and electronic devices

To implement information gathering / exchange on

At present, as a data transmission protocol for power line Home Control Network, which is relatively widely used;

① X-10

② CEBus

③ LonWorks

Etc. -Table 1-

division X-10 CEBus Lonworks Transmission speed 60 bps 8K bps 4K bps Application target Existing Residential House -Existing residential houses and new residential houses-Factory automation -New houses (composite houses and multi-family houses)-Industrial buildings-Factory automation facilities Advantages Wide range of applications (market sharing 90%) -High performance, safety, high reliability -High performance-High reliability-Suitable for complex buildings / multi-family houses (apartments, hotels) Disadvantages -Short transmission distance-Only one way transmission-Receive only simple information Low performance / price ratio for equipment requiring only simple control -High cost-Low performance / price ratio for equipment requiring only simple control

When considering only data rates or functions, the CEBus or LonWorks protocols are superior to all current power line protocols. However, the biggest drawback is that the length of the transmission packet is limited at the current technical limitations. It's too big. That is, since the transmission time per packet is too long and the transmission efficiency is low, the node access time is long when the number of nodes connected to the network is large.

In the case of X-10, the node access time is 800ms and in the case of CEBus, the node access time is 30ms.

The present invention;

① The disadvantage of X-10 protocol, which is one-way transmission method,

② Disadvantages of CEBus and LonWorks that send and receive effective data per second due to large packet length

In order to solve the problem, an object of the present invention is to transmit and receive information required by a network on a smaller packet in a variety of electrical and electronic devices in a small area using a power line, This is to shorten the transmission efficiency and data processing time.

To this end, in the present invention,

First, establish a small protocol that can efficiently control and manage various electrical and electronic devices in small powerline networks,

Second, we will build a master / slave type multi-node data transmission protocol so that they can be used not only in residential houses, but also in multi-family houses and multi-family houses.

The communication protocol PCPM to be implemented in the present invention will be described.

① Packet structure

6 byte (48 bit)

SYNC HCB ADRS CMD ／ DATA CRC1 CRC2

.

② SYNC-Synchronization byte

-establish bit synchronization

bit 7 6 5 4 3 2 1 0

0 One 0 One 0 One 0 0

.

③ HCB-Packet characteristic byte

-Display the characteristics of the packet currently being sent.

Bit 7 and bit 6 Display characteristics of outgoing packets

bit 7 6

0 0 Command Packet 0 One Data Packet One 0 ACK packet One One NACK packet

Bit 5 Specifies whether to respond to a packet currently being sent.

bit 5

0 ACK / NACK response request One No ACK / NACK response required

Bit 4 Specify whether the contents of the address field of the packet currently being transmitted are a send address or a receive address.

bit 4

0 Send address One Receiving address

Bit 3 ~ bit 0

Specify the receiving address group.

④ ADRS-address byte

Display send / receive address

⑤ CMD ／ DATA-Command / Data byte

Specify command or data content.

⑥ CRC1 byte-CRC-16 High byte

High byte of CRC-16 error correction code

Node connection time

⑦ CRC2 byte-CRC-16 low byte

Lower byte of CRC-16 error correction code

1. In the data transmission protocol implemented in the present invention, since the packet length is only 48 bits (X-10: 47 bits, CEBus: 256 bits), even when using a 4.8K bps class power line communication modem chip that can be purchased at a low cost. The node connection time is only 10ms.

2. The number of nodes that can be specified is 16, 256 = 4096 in total since up to 16 address groups composed of 256 addresses can be designated. Therefore, it is also possible to control and manage electric and electronic devices of multi-family houses and multi-family houses.

3. Due to the simple packet structure, it is possible to build protocol with minimum MCU resources.

4. Both master / slave or peer-to-peer configurations are available.

5. Since it does not depend on the transmission line, it can be used in high frequency communication and infrared communication as well as power line communication.

Claims (1)

In the communication protocol of the communication system using power line, high frequency, infrared ray, and twisted pair as transmission medium, a specific byte of the transmission packet is designated as a packet characteristic byte, 1. The characteristics of the packet currently being transmitted in two bits. Command Packet, Data Packet, ACK Packet, NACK Packet , And ② One bit, which specifies whether to respond to the packet currently being transmitted. (3) In one bit, specify whether the contents of the address field of the packet currently being transmitted are a transmission address or a reception address. ④ Specify the receiving address group as the remaining 4 bits. A method of establishing a datalink between each node as a transmission subject.