Electronic scale with display disablement
An electronic scale ( 1 ) with a display unit ( 9 ), at least one control button ( 11 . . . 14 ), a digital signal processing unit ( 5 ) and a digital interface ( 7 ) to a higher-level electronic data processing (EDP) system ( 15 ). The digital signal processing unit ( 5 ) has an activatable switch or program part for locking the scale. This switch or part releases the display of the weighing result only for as long as the higher-level EDP system ( 15 ) communicates with the scale ( 1 ) and locks the display at other times. The activation of the switch or part for the locking process is stored in a power-failure-proof memory ( 21 ).
1. An electronic scale comprising:
a display unit configured to display a weighing result;
at least one control button;
a digital signal processing unit;
a digital interface to a higher-level electronic data processing system,
wherein the digital signal processing unit comprises an activatable switch or program part that enables display of the weighing result when the higher-level electronic data processing system communicates with the scale and disables the display when the higher-level electronic data processing system does not communicate with the scale; and
a power-failure-proof memory storing an activation component of the switch or program part.
2. The electronic scale as claimed in claim 1 , wherein the display unit displays a lock symbol when the switch or program part is activated for locking the display.
3. The electronic scale as claimed in claim 2 , wherein the lock symbol depicts a padlock.
4. The electronic scale as claimed in claim 2 , wherein the lock symbol depicts a key.
5. The electronic scale as claimed in claim 1 , wherein the power-failure-proof memory comprises an EEPROM.
6. The electronic scale as claimed in claim 5 , wherein the EEPROM is a component of a microprocessor.
7. The electronic scale as claimed in claim 1 , further comprising at least a second control button, wherein the switch or program part enables the display only after a password is entered via the control buttons.
8. The electronic scale as claimed in claim 1 , wherein the switch or program part is deactivated in response to a predetermined signal from the higher-level electronic data processing system via the digital interface.
9. The electronic scale as claimed in claim 1 , wherein:
the digital interface is configured to output the weighing result to the higher-level electronic data processing system, and
the switch or program part additionally enables and locks output of the weighing result via the digital interface.
10. The electronic scale as claimed in claim 1 , wherein:
the digital interface further comprises a timer that controls the switch or program part to enable the display of the weighing result for a given time after the higher-level electronic data processing system has ceased to communicate with the scale; and
the switch or program part disables the display following expiration of the given time.
11. A method for displaying a weighing result of an electronic scale on a display unit, comprising:
in a power-on mode of the scale, enabling display of the result on a display unit of the scale when a higher-level electronic data processing system external to the scale is in communication with the scale, and
in the power-on mode of the scale, disabling the display of the result on the display unit when the higher-level electronic data processing system is not in communication with the scale.
12. The method according to claim 11 , further comprising:
in the power-on mode of the scale, enabling the display of the result during a given time after the higher-level electronic data processing system is no longer in communication with the scale.
13. The method according to claim 11 , further comprising:
in the power-on mode of the scale, displaying a symbol during the disabling of the display of the result.
14. An electronic scale, comprising:
a weighing system configured to output a weight signal;
a processing unit configured to output a weighing result in accordance with the weight signal from the weighing system;
a display for the weighing result;
a lock that enables and disables the weighing result in accordance with a communication status between the scale and a data processing system external to the scale, wherein the lock enables the weighing result during periods when the communication status is in a first status, and wherein the lock disables the weighing result during periods when the communication status is in a second status differing from the first status; and
an interface transferring data, including the weighing result and the communication status, between the processing unit and the data processing system.
15. The electronic scale as claimed in claim 14 , wherein the first status comprises an active communication link between the scale and the data processing system, and the second status comprises a severed link in the communication.
16. The electronic scale as claimed in claim 14 , further comprising a timer that controls the lock to enable the weighing result during a timer period when the communication status is in the second status.
17. The method according to claim 11 , further comprising displaying a lock symbol on the display unit when the display of the result is disabled.
18. The electronic scale as claimed in claim 14 , wherein the display displays a lock symbol when the weighing result is disabled.