Company Filing History:
4 out of 4,047 
4 out of 19,772 
Years Active: 2013-2014
Title: Zhi-Jian Long: Innovator in Testing Technology
Introduction
Zhi-Jian Long is a prominent inventor based in Shenzhen, China. He has made significant contributions to the field of testing technology, particularly in the development of innovative test fixtures and methods for serial ports. With a total of 4 patents to his name, Long continues to push the boundaries of technology.
Latest Patents
One of his latest patents is a test fixture and method using the DTR pins and CTS pins of RS-232 connectors for automatically turning on computers. This test fixture includes a first RS-232 connector and a second RS-232 connector. The data terminal ready (DTR) pin of the first RS-232 connector is connected to the DTR pin of the second RS-232 connector, and the clear to send (CTS) pin of the first RS-232 connector is connected to the CTS pin of the second RS-232 connector. The DTR pins are further connected to a power pin of each of the test computers. The test fixture sets a high level voltage for the connected DTR pins and a low level voltage for the connected CTS pins according to the commands of turning on the test computers sent by the control computer, to turn on the test computers. An auto shutdown software included in each of the test computers is executed to shut down the test computers.
Another notable patent is a system and method for testing serial ports. In this system, the serial port electronically connects to a test fixture. Test data is sent to a receive data (RXD) pin by a transmit data (TXD) pin. A test result is received from the serial port by the RXD pin. The TXD pin and the RXD pin work normally if the test data is identical to the test result. When voltages of a request to send (RTS) pin and a data terminal ready (DTR) pin are set at high level, the RTS pin, a data carrier detect (DCD) pin, the DTR pin, a ring indicator (RI) pin, a data send ready (DSR) pin, and a clear to send (CTS) pin work normally, upon the condition that status values of the serial port indicate the voltages of the above six pins are at high level.
Career Highlights
Zhi-Jian Long has worked with notable companies in the industry