dieghuot wrote:
> --- In "dieghuot" <> wrote:
>> I cannot communicate with the RS-485 port. So far I have done the
>> following:
>>
>> 1. Connected TS7800(port2, pins1-6)-->RS485toUSBconverter
>> 2. Opened /dev/ttyS1 (for COM2);
>> 3. Cleared 0xE800000C top bit (bit 15) to zero to set RS485 mode;
>> 4. Disabled both getty lines in /etc/inittab;
>> 5. Modified and tested multiple port configurations (using termios
>> functions).
>>
>> I have no problems using RS-232 and see no software errors when
>> configuring any port. At this point I am wondering if my board has
>> the rs485 option (I did purchase it).
>>
>> Does anybody know of any way to check if the option is installed? I
>> tried looking at the chips but cannot access them all.
>>
>> Any comments/suggestions would be greatly appreciated.
>>
>
> I can talk to COM2 via RS-232. Do I need to do anything to enable rs-
> 485 versus rs-232? Thanks.
It sounds like you are looking at the wrong pins. This page may be of help:
http://www.embeddedarm.com/about/resource.php?item=303#uart
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