Programmable demand register with two way communication through an optical port and external reading devices associated therewith

• US 4,542,469 A
• Filed: 08/12/1982
• Issued: 09/17/1985
• Est. Priority Date: 08/12/1982
• Status: Expired due to Fees

• Current Assignee: Duncan Electric Company Incorporated (Landis+Gyr Group AG)
• Original Assignee: Duncan Electric Company Incorporated (Landis+Gyr Group AG)
• Inventors: Mayfield, Glenn A., Szabela, William A., Forbes, Mark M., Brandyberry, Robert E., Phillips, Glen R., Gloyeski, David D., Greafnitz, Russell F., Straw, Robert L., Vollmer, William L., Stricker, Kevin L., Webeck, Richard R.
• Primary Examiner(s): Wise, Edward J.
• Application Number:
  US06/407,608
• Time in Patent Office: 1,132 Days
• Field of Search: 364/483, 364/492, 364/464, 324/103 R, 324/116, 340/870.28, 340/870.29
• US Class Current: 702/62
• CPC Class Codes: G01R 21/00 Arrangements for measuring electric power or power factor G01R7/12 takes precedence
• CPC Class Codes: G01R 21/133 by using digital technique

Abstract

A Programmable Demand Register (PDR™) which has a multi-function externally programmable time based measuring system is disclosed. An optical communication port is provided for bidirectional communication of data, said meter being capable of recordation of energy consumption in several different modes, according to the decision of the meter programmer. Meter programming is accomplished by means of any one of three separate devices, namely a Programmer/Reader (P/R) which is a sophisticated computerized device fully adapted to reprogram the PDR™ to function in any one or combination of modes as desired, to both receive and store data, and to output said data to a central billing recordation computer, and a billing period resetter (BPR) which is a battery powered device also adapted for two way communication, but limited to resetting the BPR as to data in the BPR memory, but not as to mode of operation of the BPR, and an inexpensive lightweight BPR-1 which also has two way communication capabilities, but limited to resetting the various meter functions, after insertion of a manually programmed password by the actuation of a series of switches.

Claims

1. A programmable demand register (PDR) for registering AC electric energy consumption by a load comprising:

energy flow pick-up means;

optical scanning means including light emitting and light receiving sources, completion of light transmission therebetween being periodically interrupted by said energy flow pick-up means;

a transducer responsive to the transmit-non transmit mode of said optical scanner means to produce a binary code output which is directly related to electric energy consumption and which is stored in a first memory;

clock means producing real time data;

a second memory containing program control data;

bidrectional optical communciation port means,

PDR data output means whereby, upon receipt of a signal, the data stored in said first memory is transmitted to a receiver external of the PDR; and

PDR data input means whereby the meter memories may, upon receipt of a proper password signal, be actuated.

2. The PDR according to claim 1 in which the energy flow pick-up means is comprised of a single rotatable disk positioned for response directly proportional to the energy flow through the PDR in either rotational direction.

3. The PDR according to claim 2 having at least two light emitters and two light receivers which are located inside the outer periphery of said disk, and wherein said disk has at least one slot therein.

4. The PDR according to claim 3 in which the said light receivers are exposed to a combination of ambient light conditions and light emitter output, depending on the rotational position of said disk.

5. The PDR according to claim 3 in which said emitters are serially energized and deenergized by control means forming part of said second memory whereby data reported to the said first memory is compared and checked for error, and whereby the multiplex operation conserves energy usage by the PDR.

6. The PDR according to claim 1 in which said second memory includes a NOVRAM whereby power failure conditions do not clear the data prestored in said memory.

7. The PDR according to claim 1 in which said second memory contains multiple function modes which are selectively, singly or in groups, programmable externally through said bidirectional optical communications port means.

8. A programmable demand register according to claim 7, in which said communication port means is bidirectional in that information may be inserted into the PDR through said port, or extracted from the PDR through the same port.

9. The PDR according to claim 8 in which said communication port is responsive to a predetermined external light reflectance which causes switch means in the PDR to turn on, and the absence of which reflectance conditions turns said switch means off.

10. The PDR according to claim 9 in which said light responsive switch means is exposed to ambient light conditions surrounding the exterior of the PDR.

11. The PDR according to claim 1 in which said communications port includes a single optical infrared light tunnel which extends between a meter cover and the meter face whereby extraneous ambient light sources are obscured.

12. For use with the PDR of claim 1, a Programmer/Reader (P/R) unit comprising:

a central processing unit which provides all the control functions for said P/R;

a program memory (EPROM) which controls the serial operations of the P/R;

a random access data memory (RAM) adapted for retrieval of information from EPROM or information directly written to RAM;

an optical port for bidirectional communication between the interface of said PDR and the P/R and by means of which the various metering functions of the PDR may be enabled or disabled, either singly or serially, and further by means of which meter output information is received back and stored by the P/R.

13. The P/R according to claim 12, including firmware preprogrammed into said EPROM whereby the two way communication functions between the BPR and the P/R are accomplished.

14. The P/R according to claim 13 in which all functions are passively activated and driven by power supplied from the PDR, whereby no independent power source is required on board the P/R resulting in a convenient, portable and lightweight unit.

15. The P/R according to claim 13 in which the optical communication means of the P/R is located in a self-contained headshell which is flexibly connected to the main P/R, and which headshell is adapted for magnetic affixation to the PDR meter cover, and said optical communication means being symmetrical whereby its ability to correctly communicate with the meter is independent of its rotational orientation on the meter face.

16. The P/R according to claim 12 which includes output means compatible with existing data translation stations whereby data stored in the P/R may be readily down loaded to a central translation station.

17. The P/R according to claim 12 in which additional functions are provided;

namely

billing reset is accomplished,

master reset of all circuits in the PDR is accomplished;

and password find interrogation is accomplished.

18. A billing period resetter (BPR) for use with the PDR described in claim 1 and comprised of:

a microprocessor;

a power supply;

a light emitting diode display; and

an optical communication port adapted to receive the output from the optical communications port of the PDR.

19. The BPR according to claim 18 in which the microprocessor includes a power latch circuit adapted so that the microprocessor latches itself on and then turns itself off responsive precisely to completion of the its read-out task whereby battery life is conserved.

20. The BPR according to claim 18 which includes automatic bit rate synchronizer means whereby the microprocessor times the length of the 1,0 pattern presented at its optical port and uses this data to synchronize itself with the communications speed of the PDR whereby the BPR is usable with any PDR even though bit output rates may vary between PDRs.

21. The BPR according to claim 18 including software adapted to set the date of reset into the PDR meter as it resets it whereby the date of every reset is recorded in the PDR and unauthorized resets may be readily detected.

22. A billing period resetter, of simplified construction (BPR-1) for use with the PDR of claim 1 comprising:

a group of switches manually set to selectively indicate one or zero in binary code, said code number being used to define the password for access to the PDR, and wherein only a simple memory circuit is contained in said BPR-1 whereby a low cost lightweight portable meter reading, data storage, and resetter device is provided.

23. A programmable demand register (PDR) for registering AC electric energy consumption by a load comprising:

energy flow pick-up means being responsive to the field created by the secondary coil of the PDR in the standard manner, the improvement comprising;

secondary coil input impedance compensation means including,

a bridge circuit connected so that, under stable voltage conditions, circuit current remains stable, and with voltage increase the circuit current also rises, and with voltage decrease the circuit current also decreases, and whereby all the three aforesaid conditions present the same input impedance to the said secordary coil;

optical scanning means including light emitting and light receiving sources, completion of light transmission therebetween being periodically interrupted by said energy flow pick-up means;

a transducer responsive to the transmit-non transmit mode of said optical scanner means to produce a binary code output which is directly related to electric energy consumption and which is stored in a first memory;

clock means producing real time data;

a second memory containing program control data;

bidirectional optical communication port means;

PDR data output means whereby, upon receipt of a signal, the data stored in said first memory is transmitted to a receiver external of the PDR; and

PDR data input means whereby the meter memories may, upon receipt of a proper password signal, be actuated.