Lpc2000

Richard wrote:

>We are using the MAX1480EC fully isolated driver.  There is no
>receiver enable, only a driver enable.  
>
>  
>
Ok, I used that in an 8051 design.  I don't get an echo and I don't 
disable the UART RX during transmit...


TomW

>Rich
>
>--- In lpc2000@yahoogroups.com, Tom Walsh <tom@o...> wrote:
>  
>
>>jp_thrower wrote:
>>
>>    
>>
>>>Your RS485 level conversion chip, such as an LTC485, should have a
>>>receive enable pin.  Tie a line to that and disable reception during
>>>transmit through a GPIO pin.
>>>
>>> 
>>>
>>>      
>>>
>>Yeah.  I also use a half-duplex RS485 protocol and I tie the Driver 
>>Enable and Receive Enable pins together on the LTC485.  So, when I 
>>activate the driver the reciever is disabled.
>>
>>TomW
>>
>>
>>    
>>
>>>JP
>>>
>>>--- In lpc2000@yahoogroups.com, "Richard" <richas@y...> wrote:
>>> 
>>>
>>>      
>>>
>>>>I am working with a RS485 transceiver that echoes the transmitted data
>>>>back through the receive channel.  When I switch transmission
>>>>direction from receive to transmit I wish to ignore the incoming data
>>>>as it is just a copy of what is being set.  I can't disable the UART1
>>>>in the VIC as this would kill all UART operations.  So I am trying to
>>>>disable the RBR interrupt in the U1IER register.  The problem is that
>>>>when I do this it triggers an RDA interrupt immediatly.
>>>>
>>>>What am I missing here?
>>>>
>>>>Thanks
>>>>
>>>>Rich
>>>>
>>>>   
>>>>
>>>>        
>>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>Yahoo! Groups Links
>>>
>>>
>>>
>>>
>>>
>>>
>>> 
>>>
>>>      
>>>
>>-- 
>>Tom Walsh - WN3L - Embedded Systems Consultant
>>http://openhardware.net, http://cyberiansoftware.com
>>"Windows? No thanks, I have work to do..."
>>----------------------------------------------------
>>
>>    
>>
>
>
>
>
>
>
>
>
> 
>Yahoo! Groups Links
>
>
>
> 
>
>
>  
>


-- 
Tom Walsh - WN3L - Embedded Systems Consultant
http://openhardware.net, http://cyberiansoftware.com
"Windows? No thanks, I have work to do..."
----------------------------------------------------