interface PIC16F877A with SIM900A GSM module

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I've tried to interface PIC16F877A with SIM800l V2.2 in order to send sensor data from the microcontroller. While connecting SIM800L with proteus using TTL connection all the data are sent through GSM as we expected. But while we upload the code to the PIC16F877A, there is no response from the GSM module. I've also checked the baud rate, Tx and Rx configuration, changed the PIC16F877A but we can't obtain the results. I also changed the GSM module to SIM900A but still it's not working. Is there anyone who can help me with this issue please.enter image description here

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