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

[Jason Ricles]

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?

On Sat, Nov 8, 2014 at 4:49 PM, John R Pierce <pierce at hogranch.com> wrote:

> On 11/8/2014 1:36 PM, Jason Ricles wrote:
>
>> Hi, I am trying to make a program in C to communicate with a temperature
>> sensor over my serial port that uses RS-485 and is a half duplex. I am
>> however having trouble getting the device into RS-485 mode, is it possible
>> to use RS-485 mode in Centos 6.5 or does it only support RS-232 mode?
>>
>
> standard legacy PC serial ports are strictly RS232C.    RS485 is a 120 ohm
> balanced line specification.    What host-side serial port are you using
> that has RS485 support?
>
> re: linux support, I found this: http://retis.sssup.it/~
> scordino/code/rs485.html      which suggests '485 support is pretty thin
> in Linux.
>
>
>
> --
> john r pierce                                      37N 122W
> somewhere on the middle of the left coast
>
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