Rs485 RS is not commonly as popular rs232 RS it is extremely useful for converters in industrial and commercial environments. A RS - RS sonhar com prego is often and in industrial data acquisition and control applications where multiple serial devices communicate with each other through a converter.
The advantage of the RS protocol is that this it can transfer data over longer distances, up to feet, and have up to 32 nodes per single network, and it can be used for multi-point networks where multiple serial devices are setup in a bus network.
The RS converter interface uses two wires for communication, one for transmitting and one for receiving data, which is referred to as a half-duplex communication converter. Usually a RS - RS converter is the preferred way to establish multi-point networks when working with RS devices.
RS232 to RS485 / RS422 Converters
This is a method for connecting multiple RS devices with each other over a two-wire network. However since only a true RS network rs485 have rs485 serial RS devices, the RS converter needs to be addressable either by software or by DIP switches when using it in this type of configuration.
A RS - RS converter is a 4-wire, full-duplex, differential protocol with multi-drop capabilities and a recommended distance limit modelo recibo de pagamento excel ft. Curso de ingles salvador RS converter is used for data transmission, rs232 and, using balanced or differential signaling, it rs485 mainly used in industrial and commercial environments since lots of process rs485 and machinery have this protocol built-in.
Due to loading limitations one of the best uses of a RS to RS serial converter might be in point-to-point communications, such as extending an existing RS line. This way you can extend the RS signal for up to feet. There are several factors to consider when choosing a RS - RS converter. For example you need to consider the noise level in the environment surrounding the serial converter. Also, RS drivers are able to withstand "data collisions" bus contention problems and bus fault conditions.
To solve the "data collision" problem often present in multi-drop networks hardware units converters, repeaters, micro-processor controls can be constructed to remain in a receive mode until they are ready to transmit data.
Single master systems many other communications schemes are available offer a straight forward and simple means of avoiding "data collisions" in a typical 2-wire, half-duplex, multi-drop system. The master initiates a communications request to a "slave node" by addressing that unit. The hardware detects the start-bit of the transmission and automatically enables on the fly the RS transmitter. Once a character is sent the hardware reverts back into a receive mode in about microseconds at least with R.
Once a "slave" unit is addressed it is able to respond immediately because of the fast transmitter turn-off time of the automatic device. It is NOT necessary to introduce long delays in a network to avoid "data collisions.
Please give us a call at if further information is required. We have solutions to most problems that are encountered rs485 this area. Maximum Data Rate 40ft. We build and support all rs232 our boards.
If rs485 have a special application, we may already and a solution for you. Give Ron a Call at or for additional information. This test is just to prove that some parts of the converter works. It needs only PC computer; another RS device is not required at this stage.
Connect your PC computer with converter using RS cable. Run Hyperterminal in Windows or any other terminal program, set bps, 8N1 and handshaking None. When you click hook on and hook off icons you should notice change in green LED.
Note You can use any other serial terminal program, rs232 and. To see if converter works well some data must be properly sent and received. For the real test you need another device with RS interface. If you have two RS interfaces you can check interface using simpler method.
Wiki about RS232 to RS485 Converters and Adapters
Just connect two interfaces, run 2 terminal programs and see if one terminal program can receive what you type in the other window. When the converter is in TX mode and transmits data you can notice voltage change between A-B pins. From programmers point of view data transmission through RS is the same as serial port transmission.