Hospital Intelligent Data Acquisition and Transmission Solution

Programmatic background

Patients in the inpatient department need to collect blood pressure, body temperature, heart rate and other data every day and transmit them to the hospital data center for doctors to monitor their conditions. However, the current manual measurement and statistical monitoring is time-consuming and labor-intensive. The layout of the hospital has high floors and complex room layouts. The traditional wireless communication has a blind spot, interference exists.

^{Hospital building and floor layout}

^{Hospital leveling and functional zoning}

Formula for calculating the transmission loss of wireless signals in air:

Los = 32.44 + 20lg d(Km) + 20lg f(MHz)

Los is the transmission loss. The unit is dB, d is the distance, the unit is Km, f is the operating frequency, the unit is MHz. It can be seen that the transmission loss is proportional to the frequency. That is, the higher the frequency, the greater the transmission loss. Or in the case of the same transmission loss, the transmission distance is inversely proportional to the frequency. That is, the higher the frequency, the shorter the transmission distanceThe

✪  2.4G frequency signals:

The transmission distance is short, the transmission process attenuation is large, the signal penetration and bypass ability is weak, and the signal is easily blocked by objects.

• ZigBee

Working in 2.4G band, low data transmission rate, focusing on low transmission applications. Single node transmission distance is close, need to maintain transmission routing, routing needs power supply, difficult to achieve ultra-low power consumption.

• WIFI

2.4G or 5G band, registration and authentication required, wide transmission bandwidth, based on wireless LAN (WLAN) interconnection technology, the same as Bluetooth, belongs to the same short-range wireless communication technology.

• Bluetooth technology (including BLE)

Work in 2.4G band, transmission distance is too short, need to register and authenticate, suitable for PC and peripheral equipment interconnection and very small number transmission.

This shows that the 2.4G band is currently quite crowded!

✪ 433M and peripheral frequency signals:

Long transmission distance, strong penetration and bypassing ability, less attenuation during transmission.

• star networking

Point-to-point, or point-to-multipoint transmission, mostly following the master-slave answer transmission method. Simple networking, reliable transmission. Not suitable for wide-area networking (our company supports concurrent transmission of limited nodes and competition arbitration mechanism based on signal strength).

• routing network

Flooding mode based networking approach, no routing maintenance, high redundancy in data transmission, high chance of frame loss.

• MESH networking

Based on the path recognition networking method, dynamic self-organization, self-configuration, self-maintenance and other outstanding features; technical difficulties, low effective transmission speed.

Technical Requirements for Micropower (Short Range) Short-range Radio Equipment

--Issued by the Ministry of Information and Communications in 2005

Star networking + wired transmission mode is required, compatible with distance and concurrency.

And how to balance the concurrency of the wires and the ease of engineering and construction?

Our company digital transmission bus:LBUSDigital Transmission Bus Program

LBUS is a long-distance multi-host communication fieldbus, which is different from RS485 and CAN bus in that it adopts an unbalanced transmission method, transmitting data and supplying power to the nodes at the same time. That is, through two wires, that can transmit data, but also for the nodes on the bus power supply. This is the same as M-BUS, but different from MBUS, it can provide nodes with a high current of more than 2A, due to the use of unbalanced transmission of data, the bus can also be designed as a non-polarized bus.

The baud rate on the LBUS bus is determined by the arbiter, and each host adapts itself to the baud rate on the bus and synchronizes itself automatically.

^{Differences between LBUS and other buses}

^{System Layout Schematic}

^{Connection diagram of the wired part of the system}

Program realization principle

• The whole system consists of LZBUS bus (including master and slave), 433M wireless node, and local computer PC;
• LZBUS communicates with the local computer PC through serial port (local intranet management, no data leakage), the master station communicates with each slave station through two lines, and each slave station hangs a wireless digital transmission module, and communicates with the wireless nodes governed by the slave station through the wireless module; each slave station can communicate with the wireless nodes governed by the address identification method;
• If there is a communication overlap area between the wireless nodes governed by two neighboring slaves, the wireless nodes between different slaves can be set to operate at different frequencies; in this way, kind of even if the neighboring slaves launch queries to the governed module at the same time, no wireless conflict situation will occur.

About Hainan Shidian

Hainan Shidian Technology Co., Ltd. to "make the standardization of industrial Internet of Things easier" as the vision, focusing on the direction of the Internet of Things industry chain, indoor positioning, sensing and control and data transmission products in the field of continuous research and development, Lego (Lego) production, precise to meet the small amount of industrial Internet of Things products and a variety of demand characteristics, to provide customer Complex environment and personalized needs to meet the real low inventory, high satisfaction of the new supply and demand relationship.

The company has four R&D centers in Shanghai, Suzhou, Chengdu and Taipei, adhering to the group's nearly 40 years of good business resources and reputation, firmly believe in the "be an expert in the industry" business philosophy, precise in the channel, sensitive to the market, focus on products, "research" is reliable, "production" is stable, "sales" is quality, always focusing on the industrial Internet of Things customers personalized scenarios to meet the ultimate needs. We believe in the business philosophy of "being an expert in the industry", we are precise in channels, sensitive to the market, and focus on products, "research" is reliable, "production" is stable, "sales" is quality, and we are always focusing on the ultimate satisfaction of personalized scenarios of industrial IoT customers.

In terms of products, we have both Zigbee positioning products, which have been cultivated by our self-research team for more than 10 years, and UWB positioning products, which are developed by our teams in Shanghai and Taipei, to meet the different needs of customers for positioning accuracy. At the same time, the company also introduces Bluetooth positioning products to supplement the self-developed solutions, in order to fully meet the needs of all kinds of customers.

Software support we integrate the overall program of various industries, actively open interfaces and source codes for system integrators to join, for related system software companies to do case demonstration based on our products to provide convenience, so that the Internet of Things indoor positioning applications broader.