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Programmable communication converter

A technology of communication converters and converters, applied in the input/output process of instruments, data processing, electrical digital data processing, etc., can solve the problems of single function, inflexibility, and inability to combine users, and achieve strong anti-electromagnetic interference characteristics , work stability, and accelerate the effect of research and development

Inactive Publication Date: 2006-07-26
马义德 +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently commonly used USB-485 converters generally only do simple data conversion and can meet certain requirements for use, but they all have shortcomings such as single function, not flexible enough, and cannot be closely integrated with the user's original system.

Method used

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Embodiment Construction

[0032] Such as figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 , Image 6, Figure 7 , Figure 8A-1 , Figure 8A-2 , Figure 8B , Figure 9 A programmable communication converter is shown.

[0033] exist figure 1 In the shown circuit logic block diagram, ① is the RS-485 interface circuit, and the present invention adopts two sets of schemes for different environments. MAX184+isolation diode+TVS (transient voltage suppressor) is used in general industrial environments; PS1480 is used in harsher industrial environments. 2. be 51 series single-chip microcomputers, the present invention selects for use AT89C52, one of 51 series single-chip microcomputers most widely used, has 8K ROM, 256 bytes RAM inside it, can externally expand program storage and data storage, has three timing / counters and a full double Industrial serial port, the maximum can be connected to 24M crystal oscillator, and has 6 interrupt sources at the same time. ② Connect with ① through the s...

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Abstract

The invention discloses a programmable communication converter for converting the signal based on TIA / EIA-485 standard into NRZI signal which meets the USB coding regulation, and sending to the programmable computer USB-485 communication converter via USB bus. The communication converter comprises a USB converter which comprises: a USB interface circuit, memory extension circuit, RS interface circuit, single chip machine firmware program and USB driving program; in the PDIUSBD12 and AT89C52 connection circuit, the PDIUSBD12 is parallel connected via 8 bits data / address lines, and inform AT89C52 with interruption mode. The invention has the data converting function as USB-485 converter, and can employs provided API function to extend MCU source codes in the converter.

Description

technical field [0001] The invention relates to a programmable communication converter, which is used for converting signals based on TIA / EIA-485 standards into NRZI signals conforming to USB encoding rules, and transferring them to computers through USB buses, belonging to the technical field of computer applications. Background technique [0002] In terms of data acquisition, instruments and control engineering, etc., using the USB interface to exchange information with the PC has incomparable advantages over the traditional serial port. The star topology of USB allows a USB interface to be connected to multiple USB devices in a hot-swappable manner. Its packet-based communication specification has the characteristics of high reliability and fast speed, and it can enter the sleep state within 3ms if it is not used. rules, thus greatly reducing power consumption. However, because USB uses baseband digital signals, the transmission distance is limited, and generally does no...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/00
Inventor 马义德张在峰徐光柱
Owner 马义德