On 1/31/2013 9:00 AM, khouryelie wrote:
>
> --- In Jason Stahls wrote:
>> On 1/31/2013 5:44 AM, khouryelie wrote:
>>> HELLO,
>>>
>>> I AM WORKING WITH A ts-7200, and running my com2 port in full duplex
>>>
>>> I AM NOT ABLE TO RECEIVE DATA ON MY COM2 PORT, I CAN ONLY TRANSMIT
>>>
>>> WHY IS THAT ?
>>>
>>> _______________________________
>>>
>>> FROM TS-7200 MANUAL
>>>
>>> switch COM2 into Full duplex RS-485 mode, the COM2 Mode register at
>>> 0x22C0_0000
>>> must be set to Hex 01. In this mode, the TX drivers are always asserted.
>>>
>>>
>>> "TX drivers are always asserted" is this my prob ?
>> Please answer my question from the other thread you posted about this.
>> It sounds like you have it wired up for RS485 half-duplex and trying to
>> run in full-duplex.
>>
>> --
>> Jason Stahls
>>
>
> hello jason
>
> thanks for the reply
>
> but you didnt ask any question on the other thread or i am not seeing
> anything there
>
> anyway i am 100% sure its full duplex, cause TS7200 tell me this
>
> SETTING FULL DUPLEX
>
>
> this is my code
>
> #include<unistd.h>
> #include<sys/types.h>
> #include<sys/mman.h>
> #include<stdio.h>
> #include<fcntl.h>
> #include<assert.h>
> #include<linux/ts_sbc.h>
> #include<asm/ioctls.h>
> #include<sys/ioctl.h>
>
> // futher info at
> http://wiki.embeddedarm.com/wiki/Linux_for_ARM_on_TS-72XX_User%27s_Guide#RS-485_Support_on_COM2
>
>
> #define TIOC_SBCC485 _IOW('T',0x70, int) /*TS RTS/485 mode Clear*/
> #define TIOC_SBCS485 _IOW('T',0x71, int) /*TS RTS/485 mode Set */
> #define AUTO485FD 1
> #define RTSMODE 2
> #define AUTO485HD 4
>
> int main(void)
> {
> int fd,status;
> char mcr;
> fd = open("/dev/ttyAM1", O_RDWR | O_SYNC);
> if (fd == -1)
> {
> perror("Error opening file for writing");
> }
>
> mcr = AUTO485FD;
> status=ioctl (fd, TIOC_SBCS485, &mcr);
> if(status==-1)
> {
> printf("ERROR\n");
> }
>
> }
I'm starting at the bottom, how do you have it wired? For RS485 full
duplex you should have atleast four wires (RX pair and TX pair) between
your 7200 and the USB 485 adapter.
--
Jason Stahls
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