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86 Threads found on edaboard.com: rs485 Converter
When you design project with line connected you have to be careful about isolation. Otherwise you can say goodbye to your USB ports or even your computer! If you use RS232 or rs485 communication you have to get one of isolated converter with USB input and yes they are not so cheap! So i designed open hardware platform for this purpose so you
rs485 interface voltage would be around 5V, but the OP didn't yet tell why he assumes that his "plc i/o extension" (whatever it is, no brand or type yet told) has a rs485 interface. As far as I understand, he wants to interface it with a ATmega128 UART port, so the baud rate etc. can be freely chosen. To interface an ?C with rs485, you'll (...)
Use RS232 level converter, or alternatively rs485 transceiver.
Hi guys, I'm having a ICP CON rs232 to rs485 converter. I dont know how to check whether it is working or not?. I've only one rs232 to rs485 converter and usb to serial converter. My rs232 to rs485 converter has a operating voltage is 10-30v dc. i gave power (...)
Hi, I'm trying to make an RS232/rs485 converter circuit. I used a circuit from and i changed some components on that circuit. Then i established my converter circuit that i linked the scheme. I'm also adding
I Want to read data from a sensor which has rs485 interface the computer has only usb port ,I used rs485 to usb windows i am getting the response data when i send request data.When using in linux i tried minicom software ,but I am not getting the response data when i send request data. It shows the ftdi driver for the converter.
Sir, I am using spartan 3e kit. I have rs485 voltage converter ic for communication between fpga and pc. Sir, can you give me the vhdl code for UART (rs485 protocol) or how can write vhdl program for it ? Please sir give me the idea for the problem mentioned above. Regards, Akshay B. Patil
You are confusing the names, RJ45 is the plug commonly used for ethernet connections, rs485 is an electrical specification for data transmission, I've never come across RJ485. In both cases it is possible to attach a receiver across the lines to monitor the traffic but difficult, if possible at all, to transmit into the wires. With rs485 you just
I would need to use an RS-485 protocol to connect it with problem is that i confuse about how to do it? I will need to rs485 module to sent data from one to other and the second to sent it via an rs232 module to pc? IS this the case?
In the attached circutry (its from a USB to rs485 converter), what could cause the driver SP485 to burn? I know a high voltage on the A and B wires could probably burn the SP485, but could for example a high load such as a terminal resistor placed between A and B also cause it to become overheated? Any other suggestions? 101970[/
I have developed a system in which each device can communicate with each other through rs485. In the protocol, if a device want to send out a packet, it will detect the rs485 bus first to check if any data still on the bus to avoid collision. The system work perfectly within its own network. It also works when I use a RS232-to-rs485 (...)
hi guys, I'm trying to create a converter which convert rs485 signal to USB signal using PIC18F25K50. In other words, whatever I received on the rs485 side, I will straightaway transmit it out through the USB port. I will describe my application. I have a device A and a device B which both using rs485 to communicate with (...)
I had a modbus enabled device which works fine in xp with modbuspoll software. I am using ftdi rs485 to usb converter. But it is not working in win7. I am using latest drivers for the converter. Any body had this problem before. Any solutions?
Greetings EveryBody! I AM USING: I am using B&B Electronics RS232 to rs485 converter (Model 485COSR, datasheet attached), for conversion it has MAX491 type full duplex IC in it and I connected this conerter with Computer via RS232 and on the other hand in my circuits LTC485 is used. WHAT I DID IS: Here I had to transform 4wire to 2 wi
Hi, I am new to this area , can anyone please help me in how to interface a PC and a PIC16F877A using rs485 line and the protocol being followed is MODBUS. As far as I studied modbus is an half duplex but in many posts the pic is being configured using the uart which is a full duplex ? can some one explain how it is being done ?
Dear friends, I am designing a multipurpose converter. we can configure it as follow 1. USB to RS232 2. USB to rs485 (4 Wire) 3. USB to rs485 (2 Wire) 4. RS232 to rs485 (4 Wire) 5. RS232 to rs485 (2 Wire) USB to RS232 is working properly. Now my problem is when i use USB to rs485 (...)
As per I know Mod-bus specification are there on wiki it is multi-drop rs-485 half-duplex interface.....related to PIC you will get lot of article on net....but as per your interfacing is concern you need to first work on UART....and then you need to connect RS232/rs485 converter on UART and implement the MODBUS in the PIC.... One more thing you ne
Dear all, Can some one share me the circuit diagram for connecting ttl to RS 485 and RS232 using max 485 and max 232 IC
Hi i am developing a system based on modbus protocol.Master side is PC and slave are some other devices.I will need here an rs232 to rs485 converter b/w PC and slave devices.I know that i can connect 255 slave devices with 1 master. My question is that can i use 1 rs232 to rs485 converter and attach as many slave devices (...)
First check development kit documents of the CP21XX. for minimal implementation of RS-232 which uses only Rx and Tx you will need only a Phy. like MAX232. also for RS-485, a line driver/receiver IC like MAX485 is all you need. maxim and analog devices have several interface (RS232 and rs485) products. BEST