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[SOLVED] SIMCOM serial connection qestion??

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drbizzarow

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HI to ALL

i am interfacing sim300cz with PIC microcontroller, i am supplying 5 volt to both devices my question is "Do i have to put some level convertor chip between Pic and Simcom module serial pins ,to convert PIC pin voltage level into 3 volt?
or i can connect their pins directly???

regards,
 

You have something like this:


PIC_TX ---------------------->SIMCOM_RX
PIC_RX<----------------------SIMCOM_TX

You have to put a voltage divider between the PIC_TX and
SIMCOM_RX to lower the input voltage to SIMCOM_RX.

For the SIMCOM_TX to PIC_RX you don't have to put anything, because it will be 3 V, and for TTL maximum low is 2.5 V, all above that is high level.

Regards
 
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    zeilja

    zeilja

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i think same is go for serial with DTS RTS mode ?
 

See this topic I have attached a file called "serial_port.pdf" wrote by Simcom.
Best regards.
 

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