RS-485

lisa_tx — Tue, 19 Jun 2012 03:18:51 GMT

Hello,

I use CW10.2, MQX 3.8 and TWR-K60F120M tower demo system. I would like to implement RS485. I have seen that there is demo example come with MQX which is at C:\Program Files\Freescale\Freescale MQX 3.8\mqx\examples\rs485. I have built this project, but I can’t see any data from Clear Terminal which is connected to my PC RS-232 port.

I set jumpers on TWR-SER board to make J15 as RS-485 (instead of RS-232) according to TWR-SER User Manual. I have defined BSPCFG_ENABLE_TTYF and BSPCFG_ENABLE_TTYB to be “1” at both user_config.h and twrk60f120m.h. (I check schematics of TWR-K60F120M, TWR-SER and tower boards, it looks like UART1 is connected to J15 of TWR-SER. If I am wrong, please point out to me. Thanks!). I also set BSP_DEFAULT_IO_CHANNEL to be “ttyf:”. I use SENA LTC100 RS-232 to RS485 converter connecting to J15 of
TWR-SER. I can see print out with printf() from both P&E Terminal Window (which I believe is connected to UART6)
and Clear Terminal which is monitoring RS-232 port of my PC and the other end is UART1 of demo board.

I have also tried ITTYB, there is no luck.

What I have missed? Why it doesn't work? I use CW10.2 debugger to debug this rs485 demo program, it looks like
that write() function is not successful. Please help me to identity this problem. I guess the problem is on software, not
hardware.

Thanks!

Re: RS-485 (on twr-k60f120m)

lisa_tx — Tue, 19 Jun 2012 07:28:42 GMT

Never mind. I have figured it out. UART5 (TTYF or ITTYF) is connected to TWR-SER serial connector.

MQX Software SolutionsのトピックRS-485

RS-485

Re: RS-485 (on twr-k60f120m)