SERIAL COMMUNICATION SYSTEM AND MONITOR DEVICE

• US 20090043930A1
• Filed: 12/20/2007
• Published: 02/12/2009
• Est. Priority Date: 08/06/2007
• Status: Abandoned Application

• Current Assignee: Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. (Hon Hai Precision Industry Co., Ltd.), Hon Hai Precision Industry Co., Ltd.
• Original Assignee: Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. (Hon Hai Precision Industry Co., Ltd.), Hon Hai Precision Industry Co., Ltd.
• Inventors: Wong, Shih-Fang, Deng, Yong-Jun, Li, De-Zhi
• Application Number:
  US11/960,718
• Publication Number:
  US 20090043930A1
• Time in Patent Office: Days
• US Class Current: 710/66
• CPC Class Codes: G06F 13/4286 using a handshaking protocol, e.g. RS232C link
• CPC Class Codes: H04L 25/45 using electronic distributors

Abstract

A serial communication system includes a first and second communication devices for transmitting first signals in a first standard with each other; a convertor for receiving and converting the first signals into second signals in a second standard; a controller for generating third signals in the second standard according to the second signals; and a processing unit for receiving the third signals and generating data corresponding to the first signals in responding the received third signals. A related monitor device is also provided.

Claims

1. A serial communication system, comprising:

a first and second communication devices for transmitting first signals in a first standard with each other;

a convertor for receiving and converting the first signals into second signals in a second standard;

a controller for generating third signals in the second standard according to the second signals; and

a processing unit for receiving the third signals and generating data corresponding to the first signals in responding the received third signals.

2. The serial communication system as claimed in claim 1, wherein the controller comprises a unilateral-switch circuit connected between the convertor and the processing unit, and a conductive element comprising a first terminal for receiving a reference voltage and a second terminal connected to the processing unit;

the unilateral-switch circuit is for transmitting the second signals to the processing unit when enabled, and letting the reference voltage be conducted to the processing unit when disabled.

3. The serial communication system as claimed in claim 2, wherein the conductive element has a certain resistance.

4. The serial communication system as claimed in claim 3, wherein the conductive element is a resistor.

5. The serial communication system as claimed in claim 2, wherein the convertor comprises a first and second input terminals for receiving the first signals from the first and second communication devices respectively, and a first and second output terminals for outputting the second signals to the unilateral-switch circuit.

6. The serial communication system as claimed in claim 5, wherein the unilateral-switch circuit comprises a first diode comprising a cathode connected to the first output terminal of the convertor and an anode connected to the processing unit, and a second diode comprising a cathode connected to the second output terminal of the convertor and an anode connected to the processing unit.

7. The serial communication system as claimed in claim 6, wherein the reference voltage is lower than a minimum high-level output voltage of the convertor and higher than a maximum low-level output voltage of the convertor.

8. The serial communication system as claimed in claim 1, wherein the first signals in the first standard is represented by Telecommunication Industry Association/Electronic Industries Association-232-F voltage levels.

9. The serial communication system as claimed in claim 1, wherein the second signals in the second standard is represented by transistor-transistor logic/complementary metal oxide semiconductor logic voltage levels.

10. The serial communication system as claimed in claim 1, wherein the first and second communication devices communicate with each other in a half-duplex manner.

11. A monitor device for monitoring two serial communication devices transmitting first signals in a first standard to each other in a half-duplex manner, comprising:

a convertor for receiving and converting the first signals in the first standard into second signals in a second standard;

a controller for generating third signals in the second standard according to the second signals; and

a processing unit for receiving the third signals and generating data corresponding to the first signals in responding the received third signals.

12. The monitor device as claimed in claim 11, wherein the controller comprises a unilateral-switch circuit connected between the convertor and the processing unit, and a conductive element comprising a first terminal for receiving a reference voltage and a second terminal connected to the processing unit;

the unilateral-switch circuit is for transmitting the second signals to the processing unit when enabled, and letting the reference voltage be conducted to the processing unit when disabled.

13. The monitor device as claimed in claim 12, wherein the conductive element has a certain resistance.

14. The monitor device as claimed in claim 13, wherein the conductive element is a resistor.

15. The monitor device as claimed in claim 13, wherein the convertor comprises a first and second input terminals for receiving the first signals, and a first and second output terminals for outputting the second signals to the unilateral-switch circuit.

16. The monitor device as claimed in claim 15, wherein the unilateral-switch circuit comprises a first diode comprising a cathode connected to the first output terminal of the convertor and an anode connected to the processing unit, and a second diode comprising a cathode connected to the second output terminal of the convertor and an anode connected to the processing unit.

17. The monitor device as claimed in claim 16, wherein the reference voltage is lower than a minimum high-level output voltage of the convertor and higher than a maximum low-level output voltage of the convertor.

18. The monitor device as claimed in claim 11, wherein the first signals in the first standard is represented by Telecommunication Industry Association/Electronic Industries Association-232-F voltage levels.

19. The monitor device as claimed in claim 11, wherein the second signals in the second standard is represented by transistor-transistor logic/complementary metal oxide semiconductor logic voltage levels.