ES2229901B1 - COMMUNICATIONS INTERFACE FOR REMOTE STATIONS TRANSPARENT TO COMMUNICATIONS. - Google Patents

Abstract

Communication interface for remote stations transparent to communications that allows the communication of the computer or PLC (1) with the remote terminals (8) in a "transparent" and "real time" manner, so that the logical message coming from The computer (1) is the same logical message that the remote terminals (8) receive, fulfilling the header (9) only a function of transformation of the "physical" support that allows the message to reach the remote terminal (8), and being for this, the MASTER electronic equipment (1) connected to the header (9) by a serial communications port and the electronic remote control terminals (8) through a single two-wire cable (7) that goes through all the equipment (8), and sends them the power supply in the form of a voltage current of less than 48 volts and simultaneously allows intercommunication.

Description

Communications interface for stations Remote transparent communications.

Object of the invention

The present specification refers to a invention patent relating to a communications interface for remote stations transparent to communications, whose purpose is to allow intercom between terminals  remote, "transparent" and in `` real time, without need to process the header communications or instructions that are transmitted from one terminal to another.

Field of the Invention

This invention has its application within the electronics and telecommunications industry.

Background of the invention

A communication header is a device electronic used to send power and allow the exchange of information with a network of equipment remote control electronics that are connected to the header through a single two-wire cable that goes through all the equipment, and gives them the power supply in the form of voltage of less than 48 volts and simultaneously It transmits communications.

There are currently several teams in the market that perform this function and allow automatic control systems that have their elements dispersed in a geographical area extensive

The headers existing in the market are equipped with microprocessors and act as "interlocutor" before any device (for example a control computer) that you want to communicate with the remote units, since it is your own header who controls the remote terminals and exchanges the Information with them. The device you want to exchange information with a remote terminal should contact the header and ask it to send the relevant instructions to remote terminal In turn, when the terminal receives the instructions from the header, fulfill the orders and send the information back to the header itself, for it to process and then communicate with the external device to Send you the answer from the terminal.

However, there is no known header of communications that allow communication between terminals remote, transparently and in real time, without the need for process the header the communications or instructions that They transmit from one terminal to another.

Against this, the proposed invention consists of communications interface for remote stations transparent to communications that has a great advantage in comparison with the existing ones, since it allows the communication of the computer or PLC with the remote terminals of "transparent" and "real time" form. That is, the logical message that comes from the computer is the same message logical that remote terminals receive, complying with the header only a "physical" support transformation function which allows the message to reach the remote terminal:

The message leaves the computer through the serial port converted into an RS232 signal that reaches the header, which simply adapt this signal to travel through the cable two wires and arrive directly at the remote terminal, where it is transformed back to the appropriate TTL signal type to be received by the microcontroller. In turn, the response of microcontroller comes out of it with a signal in TTL levels that transformed into a frequency signal to travel back by the two-wire cable to the head where the signal is converted to RS232 format that reaches the computer.

In this way the intermediate step is avoided necessary on existing interfaces so far, where the message from the computer is first received by the header, which it has a microprocessor that receives, rework and then Forward the message to the remote terminal. When the remote terminal Receive the message, process it and then answer the header, so that this again reprocess and send by End to the computer.

The communications interface for remote stations transparent to the communications described reduces the time required from the computer to send a message until it receives the response of the remote termination, and allows remote terminals to communicate with any device that has a port series of communications, which should simply use the communications protocol and the message format that corresponds to the remote terminal with which you want
communicate.

This new header does not perform functions of remote terminal control, but allows the device connected to it performing these control functions.

Description of the invention

The communications interface for stations remote transparent communications that the present invention proposes is an electronic device that allows communicating any MASTER electronic equipment (1) that has a serial port of communications with a network of electronic control terminals remote (8) that are connected to the header (9) through a single two-wire cable (7) that goes through all the equipment (8), and sends them the power supply in the form of voltage current less than 48 volts and simultaneously It allows bidirectional communications.

The device (9) has a Port Connector RS232 series (2) that connects to an RS232 serial port of the device MASTER (1).

The communications signal with RS232 protocol, it is transformed into a TTL signal in the signal conversation module (3).

The signal sent by the MASTER device (1), converted into a TTL signal, it enters the transmission module (4), which it also receives the electrical power coming from the source of feeding (6). This transmission module generates a current which has a variable polarity depending on the TTL signal that arrives from the signal converter module (3). This current is it propagates through the two-wire cable that forms the field network (7).

In the field network (7) the remote terminals (8), which use this current for their own power supply, and at the same time detect the polarity, what which allows them to recognize the signal sent by the MASTER device (1) and receive your message.

In this way, the remote terminals (8) receive the signal emitted by the MASTER equipment (1) immediately, as this team is issuing its message.

In turn, when one of the remote terminals (8) wants to respond to the MASTER equipment (1), then said terminal generates a frequency signal that propagates on the same cable (7), back to the communications header, which includes a reception module (5) that detects this frequency signal emitted by the remote terminal (8) and transforms it into a signal TTL

The TTL signal leaving the receiving module (5) enter the converter module (3) to be converted into RS232 signal and reach the MASTER device (1) through the port connector of communications (2).

In this way, the MASTER team (1) receives the signal emitted by the remote terminal (8) immediately, as this terminal emits its message.

Description of the drawings

To complement the description that is being performing, and in order to help a better understanding of the characteristics of the invention, is accompanied herein descriptive, as an integral part of it, a set of planes, in which by way of illustration and not limitation, it has been represented the following:

Figure number 1. - shows a diagram of blocks in which the different elements that make up are appreciated The communications interface for transparent remote stations to communications.

Preferred Embodiment of the Invention

In a network, for example water distribution in the field, there are numerous water outlet points from the network with their corresponding valves and water meters, which they integrate the network of remote terminals, and since normally in the field there are no electrical power sockets, by means of a single cable two-wire (7) that comes from the header (9) and goes through All equipment (8) is supplied with power to said terminals and communications with the unit are allowed control center

Said two-wire cable (7) and sends them the power supply in the form of voltage current lower than 48 volts and simultaneously allows communications from remote terminals (8) with a central device or MASTER (1).

For this, the MASTER electronic equipment (1) must have a serial communications port.

The MASTER electronic device (1) is connected to the header (9) through an RS232 serial port connector (2).

The MASTER device (1) sends an RS232 signal, which the signal converter module (3) converts into a TTL signal, entering the transmission module (4), which also receives power electric from the power supply (6).

This transmission module generates a current which has a variable polarity depending on the TTL signal that arrives from the signal converter module (3). This comment is it propagates through the two-wire cable that forms the field network (7).

In the field network (7) the remote terminals (8), which use this current for their own power supply, and at the same time detect the polarity, what which allows them to recognize the signal sent by the MASTER device (1) and receive your message.

In this way, the remote terminals (8) receive the signal emitted by the MASTER equipment (1) immediately, as this team is issuing its message.

In turn, when one of the remote terminals (8) wants to respond to the MASTER equipment (1), then said terminal generates a frequency signal that propagates on the same cable (7), back to the communications header, which includes a reception module (5) that detects this frequency signal emitted by the remote terminal (8) and transforms it into a signal TTL

The TTL signal leaving the receiving module (5) enter the converter module (3) to be converted into RS232 signal and reach the MASTER device (1) through the port connector of communications (2).

In this way, the MASTER team (1) receives the signal emitted by the remote terminal (8) immediately, as this terminal emits its message.

Claims (5)

1. Communications interface for remote stations transparent to communications, characterized by allowing communication of any MASTER electronic equipment (1) that has a serial communications port with a network of electronic remote control terminals (8) that are connected to the header (9) through a single two-wire cable (7) that goes through all the equipment (8), and sends them the power supply in the form of a voltage current of less than 48 volts and simultaneously allows two-way communications of transparent and real-time form, configured by a signal converter module (3), a transmission module (4), a reception module (5), a power supply (6) and an RS232 Serial Port Connector (2 ). 2. Communication interface for remote stations transparent to communications, according to the first claim, characterized in that the communications signal sent by the MASTER device (1) with RS232 protocol is transformed into a TTL signal in the signal converter module (3) . 3. Communication interface for remote stations transparent to communications, according to the first claim, characterized in that the signal sent by the MASTER equipment (1), a converted into a TTL signal, enters the transmission module (4), which also receives the power supply coming from the power supply (6), and generates a current that has a variable polarity depending on the TTL signal that arrives from the signal converter module (3), this current propagating through the two-wire cable that form the field network (7). 4. Communications interface for remote stations transparent to communications, according to the first claim, characterized in that the remote terminals (8) connected in the field network (7) use this current for their own power supply, and at the same time detect the polarity, which allows them to recognize the signal sent by the MASTER device (1) and receive their message immediately, as this device sends its message. 5. Communications interface for remote stations transparent to communications, according to the first claim, characterized in that the response of the remote terminals (8) to the MASTER equipment (1) is carried out by means of a frequency signal generated by the terminal that it is propagated by the same cable (7), back towards the communication header (9), by means of the reception module (5) that detects this frequency signal emitted by the remote terminal (8) and transforms it into a TTL signal , entering the converter module (3) to be converted into RS232 signal and arrive, through the communications port connector (2), to the MASTER equipment (1) that receives it immediately, as this terminal emits its message.