Adapter for providing digital communication between a field device and a computer

• US 20080114911A1
• Filed: 11/09/2006
• Published: 05/15/2008
• Est. Priority Date: 11/09/2006
• Status: Active Grant

• Current Assignee: Rosemount Incorporated (Emerson Electric Company)
• Original Assignee: Rosemount Incorporated (Emerson Electric Company)
• Inventors: Schumacher, Mark S.
• Granted Patent: US 7,675,932 B2
• Time in Patent Office: Days
• US Class Current: 710/72
• CPC Class Codes: G05B 19/0423 Input/output
• CPC Class Codes: G05B 2219/25166 USB, firewire, ieee-1394
• CPC Class Codes: G05B 2219/25425 Personal computer
• CPC Class Codes: G05B 2219/25428 Field device
• CPC Class Codes: G06F 13/385 for adaptation of a particular data processing system to different peripheral devices

Abstract

An adapter provides the components necessary to operate a computer or similar device as a communicator for smart field devices. The adapter includes terminals adapted for connection to the field device and a communication cable adapted for connection to the computer. Memory located within the adapter stores application software associated with the communication protocol employed by the field device. The application software stored by the memory is loaded onto the computer via the communication cable, allowing a user to receive and send data to the field device based on the communication protocol employed by the field device. The adapter includes a port circuit that interfaces bi-directionally communication between the computer and the field device using the communication protocol.

Claims

1. An adapter for interfacing communications between a computer and a field device, the adapter comprising:

terminals adapted for connection to the field device;

a communication mating device adapted for connection to a communication port on the computer;

a memory module for storing application software with respect to a plurality of communication protocols, wherein application software specific to a communication protocol employed by the field device is uploaded onto the computer via the communication mating device, the application software allowing the computer to send and receive data based on the communication protocol employed by the field device; and

a port circuit connected to the field device by the terminals and to the computer by the communication mating device, wherein the port circuit interfaces bi-directional communication between the field device and the computer based on the communication protocol employed by the field device.

2. The adapter of claim 1, wherein the adapter provides communication between the port circuit and the computer over the communication mating device using a Universal Serial Bus (USB) protocol.

3. The adapter of claim 1, wherein the field device communicates with the port circuit using a Highway Addressable Remote Transducer (HART) protocol and the computer is configured with application software specific to the HART protocol.

4. The adapter of claim 1, wherein the field device communicates with the port circuit using a Fieldbus protocol and the computer is configured with application software specific to the Fieldbus protocol.

5. The adapter of claim 1, wherein the field device communicates with the port circuit using a Profibus protocol and the computer is configured with application software specific to the Profibus protocol.

6. The adapter of claim 1, further including:

a power supply switchably connected between the port circuit and the terminals, wherein the power supply is connected between the port circuit and the terminals to provide power to the field device when no other external power is provided to the field device.

7. The adapter of claim 6, wherein the power supply receives the power provided to the field device from the computer via the communication mating device.

8. The adapter of claim 1, further including:

a resistor switchably connected between the port circuitry and the terminals, wherein the resistor is connected as required to provide a resistance necessary to allow communication based on the communication protocol employed by the field device.

9. The adapter of claim 1, further including:

an auto-detect circuit connected to detect the communication protocol employed by the field device, wherein the detected communication protocol is communicated to the port circuit.

10. The adapter of claim 9, wherein the port circuit causes the application software specific to the communication protocol detected by the auto-detect circuit to be uploaded to the computer from the memory module.

11. A method of providing bi-directional communication between a computer and field device using an adapter, the method comprising:

connecting the adapter to the computer using a communication mating device;

connecting the adapter to the field device using a pair of terminals;

detecting a communication protocol being employed by the field device;

transferring application software from memory located within the adapter to the computer, wherein the application software uploaded to the computer is associated with the detected communication protocol employed by the field device and allows the computer to send and receive data based on the communication protocol employed by the field device; and

communicating data bi-directionally between the field device and the computer based on the communication protocol employed by the field device.

12. The method of claim 11, wherein communicating data bi-directionally between the field device and the computer includes:

receiving an instruction from the computer via the communication mating device, wherein the instruction is formatted based on the communication protocol of the field device;

transmitting the instruction received from the computer to the field device via the pair of terminals, wherein the instruction is transmitted using the communication protocol of the field device.

receiving data from the field device via the pair of terminals wherein the data is received from the field device using the communication protocol of the field device; and

transmitting the data received from the field device to the computer via the communication mating device.

13. The method of claim 12, wherein the communication mating device connecting the adapter to the computer employs the universal serial bus (USB) communication standard.

14. The method of claim 11, further including:

selectively connecting a power supply located within the adapter to the field device based on whether the field device is receiving the required power from an external power supply.

15. The method of claim 14, wherein the power supply receives the power provided to the field device from the computer through the communication mating device.

16. The method of claim 11, further including:

selectively connecting a resistor located within the adapter to the field device based on whether a required amount of impedance is present between the field device and the adapter.

17. The method of claim 11, wherein transferring application software from memory located within the adapter to the computer includes:

automatically transferring application software from the memory located within the adapter to the computer based on the detected communication protocol employed by the field device.

18. An adapter that interfaces communication between a computer and a field device, the adapter including:

means for connecting the adapter to the computer;

means for connecting the adapter to the field device;

memory means for storing application software associated with a plurality of field device communication protocols, wherein the application software associated with a communication protocol employed by the field device is loaded onto the computer using the means for connecting the adapter to the computer; and

means for communicating data bi-directionally between the field device and the computer based on the communication protocol employed by the field device.

19. The adapter of claim 18, further including:

a power supply switchably connected to provide power to the field device when no other external power is provided to the field device.

20. The adapter of claim 19, wherein the power supply receives the power provided to the field device from the computer via the means for connecting the adapter to the computer.

21. The adapter of claim 18, further including:

a resistor switchably connected to the field device, wherein the resistor is connected as required to provide the resistance necessary to allow communication based on the communication protocol employed by the field device.