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PIC Serial Communication

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eda_

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Hello I need to make a serial communication with PIC877A .

PIC877A must communicate to device to get inf. via Modbus .

At same time PIC877A must connect with rs232 to the Meter to get required datas over modbus too.

At the same time PIC must connect to GSM module to make SPI communication.

But I have only one serial TX,RX pins. how can I do this ?


Thanks
 

Preferably use a PIC with more serial interfaces. Otherwise, use any available "poor man's" methods to work with existing PIC:
- slow software UART
- sequential usage of the hardware UART through external multiplexer

In case of the MODBUS communication, do you necessarily need two separate bus segments?

I guess, the GSM communication will be UART, not SPI?
 
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