UART Communication between GSM and GPS

Ankur's picture

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Joined: Apr 22, 2019

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UART Communication between GSM and GPS
April 22, 2019 - 9:03pm

UART Communication between GSM and GPS 

I want to establish a UART Communication between GSM and GPS.
The Supply Voltage of GPS is 3.3V.
The Supply Voltage of GSM is 3.8V.

The measured RX/TX Voltage Levels of GPS is 2.8V and 0V (for logic High and logic Low).
The measured RX/TX Voltage Levels of GSM is 1.8V and 0V (for logic High and logic Low).

Since there is a difference between RX/TX logic levels of the GSM and GPS, So I am 
not able to establish the UART Communication between GSM and GPS.

Please suggest me a possible way to perform voltage (or Logic) level shifting.

Aswinth Raj's picture

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Between GSM and GPS?
April 26, 2019 - 2:15pm

What GSM or GPS module are you using?

I do not understand the part where you say the GSM and GPS should communicate with each other. Normaly a microonctroller is used to communicate with these two modules. 

Ankur's picture

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Joined: Apr 22, 2019

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UART Communication between GSM and GPS
April 28, 2019 - 8:04pm

I am using the interpreter of the telit gsm to process the data recieved from the GPS

Bradyen's picture

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baud rate?
April 29, 2019 - 11:15am

Did you check for baud rate? Your GSM modem and GPS should work in same baudrate for them to talk to each other.

Provide part number for both, this will help people understand what hardware u r using 

Araldo Janes's picture

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Joined: Apr 30, 2019

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Hello...as per my knowldge
April 30, 2019 - 11:35pm

Hello...as per my knowldge GSM modules usually has output with 1.8V (for example VAUX/PWRMON on Telit LE910), ypu could use it to power level shifter ic.Not sure about GPS module though. Specific part number would be helpful