RU192913U1 - RS232 interface splitter - Google Patents

Abstract

A useful model of the RS232 interface splitter relates to electronic devices that are designed to integrate devices having an RS232 interface and operating via an exchange protocol in which one device is a master and several slaves are connected into a single local area network. An example of such protocols is the Modbus, Bsap, and others. “RS232-RS232-RS232 splitter”, the interface signals of which are interconnected by means of the “OR” logic element, made on diodes, characterized in that the interface signals are converted into standard logic signals using level converters and interconnected using an active logical element "OR", executed on the active elements.

Description

The invention relates to electronic devices that are designed to integrate into a single, local, computer network devices that have an RS232 interface and operate by an exchange protocol in which one device is a master and several devices are slaves. An example of such protocols is the Modbus, Bsap, and others.

The prior art (see patent No. SU 434610 IPC H04L 12/52 publ. November 6, 1974) there is known a device for temporary asynchronous switching of pulse signals containing a random access memory unit, two outputs of which are connected via decoders to the control inputs of the electronic contacts of the n output channel sets and to the control inputs of the m output channel sets, respectively, characterized in that, in order to improve the accuracy of correction of edge distortions and simplify switching the device between the outputs of the electronic contacts of the input channel GOVERNMENTAL sets and inputs of RAM block group are connected in series comparator, a control unit and replaceable time channels, an additional input connected to outputs of decoders.

The disadvantage of this device is that this device is designed for switching telegraph channels, the essence of which is the ability to change the duration of the start pulse, on the basis of which the switching occurs. This device will not be able to work on devices organizing the exchange of information using modern exchange protocols.

From the prior art (see patent No. US 6940868 IPC Н04В 1/38; Н04В 3/36; Н04В 3/54; Н04В 7/14; H04J 3/16; H04J 3/22; H04L 12/56 publ. 06.09.2005 d) a digital serial communication hub is known that has the ability to separate, route, and the ability to restore data to a stream at mixed transmission rates, the mixed nature of the framing bits, as well as mixed protocols without pre-installation. In addition, the communication node stores and retrieves serial data in the time domain, and uses simple and reliable error correction, which uses the time-domain data format. Physically, the device is implemented as a printed circuit board on which a central processor with several serial communication ports is located. Serial ports are connected to a combination of electrical interfaces, which include RS232, RS485, TTL. Serial ports are routed through the central processor, which controls the data stream and routes them to the serial data connectors.

The disadvantage of this concentrator is that the use of a microcontroller for processing and switching data significantly complicates the design scheme, requires the development of software for the controller, and the use of a microcontroller for switching interfaces operating via an exchange protocol, in which one master device and several slave devices ( slave) is not economically feasible.

The closest to the claimed technical solution for the combination of essential features is: - "Splitter RS232 - RS232 - RS232" described in the information source (see http://www.shematic.net/page-279.html publ. 15.11.2009, ) In this device, the RS232 interface signals are interconnected using a logical "OR" element. In this case, the inputs of the interfaces are connected to the outputs using a logical "OR" performed on the diodes.

The disadvantage of this device is that it does not allow to obtain a signal that fully complies with the RS232 standard at the outputs of the switched interfaces. Therefore, not all devices connected to the splitter will work with it. The absence of level converters reduces the load capacity of the interface and, as a result, imposes additional requirements on the switching lines.

The technical task of creating the claimed device is to create a simple electronic device that can integrate into a single local-area network devices that have only the RS232 interface. In this case, the signal levels must comply with the RS232 interface, to ensure uninterrupted operation at speeds up to 115200 baud.

The problem is solved in that. "Splitter RS232 - RS232 - RS232" whose interface signals are interconnected using a logical element "OR" made on diodes characterized in that the interface signals are converted into standard logic signals using level converters and interconnected using the active logical element "OR" performed on the active elements. The interface splitter, made according to the proposed scheme, using standard level coordinators, fully implements the RS232 interface according to the declared standard, and this resulted in a simple, and therefore reliable device. The cost of manufacturing the device is significantly lower than the cost of manufacturing similar devices identified from the prior art. This device does not require additional configuration, does not require additional programming of the device itself, does not require changing the settings of the exchange protocols, and has very low power consumption.

An analysis of the known technical solutions, carried out according to scientific, technical and patent documentation, showed that the set of essential features of the claimed technical solution is not known from the prior art, therefore, it meets the patentability conditions of “novelty” and “industrial applicability”.

The claimed technical solution is illustrated by the functional diagram of FIG.

The splitter consists of several RS232 interface level converters U1, U2, U4 and Un, one of which U4 is connected to the host interface, and the rest to the slave interfaces.

The converters are designed to convert levels and invert RS232 interface signals to standard signals (TTL, CMOS, and other logic), for further branching.

The output signal of the converter U4 (RS232 master) is directly connected to the inputs of the converters U1, U2, Un (RS232 slave). The output signals of the converters U1, U2, Un (RS232 slave) are connected to the input of the element U3 output, which is connected to the input of the converter U4 (RS232 master). Element U3 is a logical element of the type "OR" (repeater) performed using active elements.

The device operates as follows.

The master device, whose interface is connected to the interface, the RS232 master splitter, issues a request signal. This signal simultaneously arrives at all output elements of the interfaces of the RS232 slave splitter and further to the inputs of the interfaces of the slave devices. Slave devices process this request and a device whose address matches the request address initiates data transfer. The transmission signal is fed to the input of the RS232 slave splitter and then through the repeater element U3 to the output of the RS232 master splitter interface and then to the master. The exchange of information occurs until the master changes the address of the slave device, while another device comes into operation, and the other devices are in standby mode.

The claimed technical solution meets the requirement of industrial applicability and can be manufactured on standard equipment using modern materials and technologies.

Claims (1)

“Splitter RS232 - RS232 - RS232", the interface signals of which are interconnected using the logical element "OR", made on diodes, characterized in that the interface signals are converted into standard logic signals using level converters and interconnected using an active logical element "OR", executed on the active elements.

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