8 Threads found on edaboard.com: rs485 Programming
If you already have rs485 hardware, it's ok, but if you cn choose the interface HW, I would have split Rx an Tx, and made a full duplex RS422 connection.
rs485 is half duplex and you need to establish a proper protocol to manage who is transmitting at a given time. even if you listen in on the transmission you can't tell if you have a collision
Microcontrollers :: 09-22-2015 10:01 :: Gorgon :: Replies: 3 :: Views: 509
MAX485 is convert UART to rs485. So, the programming is easy still use UART.
Only, MAX485 need 1 more control RE/DE for either transmit or receive. If 1 part is transmitting, all other part must receiving.
Microcontrollers :: 07-27-2012 21:48 :: engshahrul :: Replies: 1 :: Views: 943
i am using datamate 3000 for my is an small room air-condition monitoring device.. for my project i need to get the parameter details from datamate 3000 using rs485.. and then transmit the data using another rs485 to host.. i need some programming help... how to start with datamate 3000...
PC Programming and Interfacing :: 05-29-2012 21:02 :: praba_J :: Replies: 1 :: Views: 677
i have a circuit on Pcb, for rs 485 and am using avr atmega8, now when i make the power on and conncet the rs485 to pc using rs485-rs232 converter using hyper terminal i get this error "cannot open COM Port3 check port settings"
now when the power is removed this msg is not displayed, moreover if just avr is removed fro
Microcontrollers :: 09-28-2010 08:28 :: sherazi :: Replies: 21 :: Views: 3236
Could you please evaluate more about your request? There is many way to interface a PIC or more generally spoken a microcontroller with a PC, here is some example:
- SERIAL (RS232 or RS422/rs485)
Microcontrollers :: 09-16-2008 12:42 :: TekUT :: Replies: 2 :: Views: 1078
I am playing with serial port under windows 2k trying to implement modbus master working over rs485 in halfduplex mode . 232-485 covnerters transmit direction is controlled via RTS line (similar to described in Serial port complete).
My problem is - i can not properly detect end of transmission (when last character has been transmitted from com po
PC Programming and Interfacing :: 08-03-2006 05:23 :: artem :: Replies: 1 :: Views: 1557
10 week course using C covering multiple issues from rs232 rs485 CAN adc ...
hope you enjoy
Embedded Linux and Real-Time Operating Systems (RTOS) :: 10-29-2004 12:16 :: ZeleC :: Replies: 6 :: Views: 3127
I want to write a program, running under PC. linux (redhat).
to use PC.'s serial port work as rs485, use DTR to control direction.
(use 75176 or MAX485)
Could anyone show me the sample?
Should I need to modify kernel source's serial port driver?
PC Programming and Interfacing :: 12-13-2004 06:52 :: ZeRoN :: Replies: 2 :: Views: 3293