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Control circuit of LT 8031 GPRS IP wireless digital transmission terminal for remote-digital transmission

A remote data transmission and control circuit technology, applied in the field of wireless data transmission modules, can solve problems such as the baud rate cannot be changed, the communication interface is single, and the reliability of automatic reset cannot be guaranteed, so as to achieve the effect of easy product development and simple network interface

Inactive Publication Date: 2005-08-10
林东
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to other manufacturers in the market, there are the following defects when using GPRS IP MODEM: 1. In unattended occasions, the reliability of automatic reset cannot be guaranteed if the abnormal situation of GPRS IP MODEM occurs, and it is easy to cause the device to be in a "dead" state for a long time. affect the normal operation of the system
2. Due to the limited fixed IP resources of the public network, the wireless communication system composed of GPRS IP MODEM will interrupt the connection link between the GPRS equipment and the management center when the management center is offline. The generated new IP address resets the system, resulting in a waste of manpower and material resources
3. When the receiving device of the management center loses power or "crashes", the GPRS device cannot judge that the management center has been disconnected
4. The baud rate cannot be changed, the communication interface is single, etc.

Method used

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  • Control circuit of LT 8031 GPRS IP wireless digital transmission terminal for remote-digital transmission
  • Control circuit of LT 8031 GPRS IP wireless digital transmission terminal for remote-digital transmission

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Embodiment Construction

[0009] The specific circuit and working principle of the present invention will be described in further detail below with reference to the accompanying drawings.

[0010] The main control circuit (1) described in the technical solution of the present invention is mainly composed of single-chip microcomputer U6 (at89C4051 can be used), crystal oscillator E1 (using 11.0592M), and capacitors C6, C7, and C8, among which E1 and C7, C8 are composed Oscillation circuit, C6 is the filter capacitor between the power supply and the ground. The RST terminal of the single-chip microcomputer U6 is the input terminal of the hardware watchdog circuit (5) reset signal, which is used to provide the external reset pulse required by the single-chip microcomputer. The CON terminal of U6 is The control terminal of communication / setting switching between the lower computer and GPRS IP MODEM, the WDI terminal of U6 is connected with the corresponding port of the hardware watchdog.

[0011] 2. The switch...

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Abstract

The disclosed circuit is composed of main control circuit, ON-OFF control circuit, electrical level conversion circuit, channels switching circuit, input and output interface circuits, and watchdog of hardware circuit. Through ON-OFF control circuit, channels switching circuit, electrical level conversion circuit, and input and output interface circuits in sequence, the main control circuit is connected to hypogyny device electrically. Connected to ON-OFF control circuit and interface of MODEM communication port, the main control circuit controls connection to GPRS IP MODEM. Output of watchdog circuit is connected to input end of main control circuit. The invention makes LT8031 realize seamless coverage without need of fixing IP and host by using advanced GPRS technique. Advantages are: minimum flow charging, providing simpler network interface for users, flexible to select interfaces through jumper, and all sided optimization making development easier etc.

Description

Technical field [0001] The present invention relates to an industrial-grade wireless data transmission module (control circuit of wireless data transmission terminal), specifically a control circuit of LT8031 GPRS IP wireless data transmission terminal for remote data transmission, which can be used for Control of data exchange between GPRS IP MODEM and external devices such as electricity meters. technical background [0002] Since the wireless network technology began to be researched and put into use in the 1980s, it has gradually developed with its advantages of flexibility, ease of use, and wire-free. Especially in recent years, major breakthroughs have been made in network technology, which has accelerated the development of wireless network technology and products. Among them, the Global System for Mobile Communications (GSM system for short) is a circuit switching system that has been widely used. Due to the low data transmission rate of GSM, this circuit switching method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/12
Inventor 林东
Owner 林东
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