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Problem on receiving RS232 data using hardware USART
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puppie7777

Joined: 09 Jun 2004
Posts: 25
Location: Monterey, CA

Posted: Mon Sep 05, 2005 3:54 am

Quote:

Siemens modems usually includes a complete 16C550 compatible serial ports
(comm signals + control signals) that can be configured with jumpers.
Could you pls tell us a full description of the modem comm port conection with the PIC ?

Quote:

1. Have you enabled the INT_RDA interrupts,??
2. Have you written the isr handler for this.
3. In case you have done all this, we first ensure the interrupt is called,
4. Have you enabled the watchdog timer ?? If so are you reseting the timer..?

Hi, Humberto,
Thank you so much for ur reply. I am using Siemens modem MODULE NOT modem TERMINAL, it is a TTL level connection.

Hi, arunb,
Thanks for ur reply too. Now my problem was solved. All my ISR or polling routines works fine. It is a hard ware design problem, finally i found that the Siemens modem module works at TTL voltage level of 4.3v, just pull down the voltage to 4.3v at the RX pin. It works so nicely...

Thank you all!

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