Working with Uart and Sim800l

[Prashant Singh]

Hi,

  I am working with nrf52DK and Sim800l, I want to send some data using GPRS commands like AT etc.
I am having a market build module for Sim  www.circuitstoday.com/.../gsm_module.jpg
I am trying to establish a connection using the ble_app_uart example from SDK but I am unable to send AT command.
 Same tried with UART example also.
Connections done are DK pin P0.06 -> Rx of Sim, DK pin P0.08 -> Tx of Sim, given ground and power supply.
Baud Rate used is 115200.
if I am disconnecting TX and RX pin from Sim I am able to see data(AT command) in the terminal.
Any Help would be appreciated.

[awneil]

if I am disconnecting TX and RX pin from Sim I am able to see data (AT command) in the terminal.

Sorry, it's not clear what "data" you're talking about - is that the data from the nRF52, or data from the SIM800?

Can you communicate from a PC terminal with the SIM800 using the same connections?

Can you communicate from a PC terminal with the nRF52 using the same connections?

You need to narrow down exactly what is and is not happening.