Multiprotocol isolation-type digital signal excitation source

Abstract

The invention discloses a multiprotocol isolation-type digital signal excitation source, which belongs to the technical field of embedded measurement. A control signal and a data signal are connected to bus signal transceivers (RS232(103), RS422(104), RS485(105), CAN bus transceiver (106) and ARINC-429 bus transceiver (108)) via input interfaces. The CAN bus transceiver (106) outputs the signals to a CAN bus driver (107). The ARINC-429 bus transceiver (108) outputs the signals to an ARINC-429 bus driver (109) via a signal isolation circuit (110). Output ends of the RS232(103) bus signal transceiver, the RS422(104) bus signal transceiver, the RS485(105) bus signal transceiver, the CAN bus driver (107) and the ARINC-429 bus driver (109) are connected onto an FPGA (111) via a level conversion circuit (112), the FPGA (111) is internally provided with a data processing circuit and an embedded soft core processor, the processor caches the data to an SDRAM, the data are transmitted to a host terminal (113) via the RS485 transmitting and receiving circuit (105) from the SDRAM, and the core processor is an nios processor. Signal parameters are programmable, signals are mutually electrically isolated, and the data transmission stability can be improved.

Description

Technical field: [0001] Based on the FPGA and RS485 network technology and digital signal isolation technology, the present invention realizes the isolation of digital signals, noise and interference signal elimination, sets the sending data and signal baud rate by the PC, and loads the generated data quickly and stably to the The function of the module under test belongs to the field of embedded measurement technology, and realizes an isolated bus digital signal excitation source device that can generate up to 18 different bus types at the same time. It is suitable for testing occasions requiring high reliability of signals such as aerospace. Background technique: [0002] The digital excitation source is a device that provides digital signals for the equipment under test and sends the feedback signals to the host computer for analysis and processing. The high-performance digital signal source has the characteristics of high cost and poor flexibility, which limits its scop...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the current shortcomings of digital signal sources in the field of aerospace such as low integration of signal types, poor versatility and anti-interference, and high requirements for accuracy and signal reliability, the present invention proposes an isolated multi-protocol The implementation method of digital signal excitation source to solve the demand problem of high reliability and low bit error rate digital signal source integrating multiple bus signals at the test site of missile-borne module

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