[CentOS] RS-485 over a half duplex serial in Centos 6.5

[Jason Ricles]

Gotcha and yes that was the problem I was having, I could transmit but
would just get bounced but what I transmitted due to not being able to
set transmit mode. So I basically have to use

/drivers/serial/crisv10.c: serial driver used on the Cris ETRAX platform
/drivers/serial/atmel_serial.c: serial driver used on Atmel platforms
(AVR32 and AT91 included)

for my drivers. Sorry I am not a fully hardware guy so am a little
lost at some of this stuff, but I know the software is not working
since the hardware has no way to know how to interact through
software.

On Sat, Nov 8, 2014 at 5:16 PM, John R Pierce <pierce at hogranch.com> wrote:
> On 11/8/2014 1:55 PM, Jason Ricles wrote:
>>
>> I am not too sure, it is for work and we got a custom board. My co worker
>> who is more the hardware guy set it up. I did notice it is thin before 3.0
>> kernal. I saw in the 3.0 kernal they have more support. So we are
>> basically
>> up the creek without a paddle with the device and kernal 2.6. Would a
>> RS-485 to RS-232 converter possibly fix the problems?
>
>
> the problem is, a 232-485 converter needs to be told when to be in transmit
> vs recieve mode for a half duplex single pair circuit to function.  as that
> article says, this can be done by using the RS232 RTS signal to control the
> RS485 line driver, but the linux driver has to know about this and support
> it.
>
>
>
>
> --
> john r pierce                                      37N 122W
> somewhere on the middle of the left coast
>
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