DE19959790A1 - Remote-controlled resetting of memory circuit of electric operating device with serial interface - Google Patents

Abstract

The method involves remotely resetting a memory circuit of an electric operating device with a serial interface, whereby the baud rate of the reading/operating instrument for transmitting of a reset instruction is lowered with respect to the remaining data transmission signals, so far, that the bit length of the reset instruction exceeds the length of a data group of the remaining data transmission signals, limited through a stop signal. At least one bit of the reset instruction is transmitted, which is recognised by a detection circuit in the electric operating device due to its bit length, as an instruction triggering a reset signal.

Description

The invention relates to a method for remote control Resetting the operating parameters of electrical operation means, especially overcurrent releases for low-voltage Circuit breaker.

For electrical equipment, such as motor drives, overcurrent triggers of circuit breakers and. are programmable known electronic circuits that the desired Be save drive parameters and to control the operation with use. In modern devices, micropro is used for this cessors used that are universally usable and via appropriate software to the task of each have the device adjusted.

For parameterizing the operating parameters and for reading the operating parameters and the status values of the monitored or controlled system during operation by the Be The drivers are provided with an interface that connect to an operating device or a reading device leaves.

For example, US-A 4,751,605 is a portable reading device advises on the operating parameters of an electronic overcurrent trigger known that it should allow the set Read out values via an infrared path.

DE-A 196 13 027 describes a manual control device for parameterization known from electrical devices, with the operating parameters  can be read out, but also changed if necessary, d. that is, bidirectional data transmission is possible.

Furthermore, DE-A 197 44 206 is an overcurrent release for Lei switch known in addition to the exchange of data decentralized control of the over via a data bus current release, possibly also a switching operation of the Circuit breaker, e.g. B. allowed from a control room.

The manufacturer can also provide the interface for additional Purposes are used, such as manufacturing testing and qualification crime control.

However, previous solutions do not allow operation with tel can be remotely controlled in a defined initial state bring and so z. B. stored status values of the system to delete.

So far, additional buttons have been used for such a function the reset input of the microprocessor connected to manu ell trigger a reset signal. This must be special Measures are taken to prevent everyone from being driver can give a reset signal by itself and thereby possibly a permanent reset.

The invention is based on the object of a method admit with which the equipment is called at the beginning type of reset can also be triggered via a reading and operating device leaves.

According to the invention, the object is achieved by the features of claims 1 and 2.  

Then the baud rate of the reading / operating device becomes the transfer reset command compared to the other data transfers tion signals reduced so far that the bit length of the Re set command the length of the da limited by a stop signal ten group of the remaining data transmission signals exceeds. At least one bit of the reset command is transmitted which is based on its bit length from a detection circuit in trigger the electrical equipment as a reset signal sending command is recognized.

For example, the reading / operating device that a speci handheld device can also be a laptop or a PC, generates a low signal after a stop bit, the length of which is longer is larger than a normal data group. So that remains from device to be reset from the expected stop bit, so after Expiry of an additional safety time, a reset signal generated. The memory circuit to be reset is ei ne detection circuit assigned that only the length one of the bits set by the reader / control device, i.e. the one previously named low signal, evaluated by means of a timing element and reset the memory after a preset time circuit triggers.

During normal data transmission, this long low- Pulse does not occur because the higher baud rate ensures that at least one stop bit be the long low pulse to a agreed time interrupts.

The arrangement is also a principle representation of the drawing refer to. The memory circuit to be reset is at for example part of an electronic overcurrent release for a circuit breaker that has a serial interface has that with a reading / operating device, in the drawing  generally named as a communication partner can. Data is read in via the data line RxD (receive data) which is compared to the GRD high Level and from the communication partner to low Level can be set. Each data group is usually starting with a start bit and ending with a stop bit transmit the data line RxD.

A detection circuit ES evaluates with the help of a timer the length of the bits with low level. Provided is that at the input the RxD input of the overcurrent trigger is high when there is no communication partner connected. If this exceeds the length of a norma len data group that would be limited by the stop bit, he said the detection circuit ES knows a reset command and he generates a reset pulse for the memory at its output circuit. The operating parameters of the Über current release brought into a defined initial state. The reset command can be defined in software so that it can only be triggered by authorized personnel or in within a pro defined for certain operating cases sequence is triggered automatically. The operator of the Plant can thus be deliberately triggered a reset can be excluded.

Claims (2)

1. A method for remotely resetting the memory circuit of an electrical device with serial interface, in particular of electronic overcurrent releases for low-voltage circuit breakers, characterized in that the baud rate of the reading / operating device for transmitting a reset command is reduced as far as the other data transmission signals that the bit length of the reset command exceeds the length of the data group of the other data transmission signals, which is limited by a stop signal, and at least one bit of the reset command is transmitted which, based on its bit length, is triggered by a detection circuit in the electrical equipment as a command triggering a reset signal is known. 2. Arrangement for resetting the memory circuit one electrical equipment with serial interface, especially of electronic overcurrent releases for never the voltage circuit breaker, characterized, that the memory circuit is assigned a detection circuit net is whose input with the serial interface and their output with the reset input of the memory circuit is connected, and that upon detection of an active input signals of a predetermined length a reset signal for the Memory circuit trips.