Cytron Technical Forum

How to interface the new TC35 to a laptop? Can I use a USB-Serial converter to connect the modem to the laptop. Also based on the documentation in this link: https://docs.google.com/document/d/1Nmk ... f2b2o/edit, where is T0 and T1 in the latest TC35 board? The part P3 in the latest board only has 4 pins, "GND,RXD,TXD,VCC".

I have the old board if you claim yours is new

Show the picture of the new board, maybe I can figure out some possible interface.

Hi,

recently i have purchased Siemens TC35 gsm module from Cytron.I inserted a sim card with credit within it.However, i have certain issues with it.The issues are:

1)There are 4 pins indicating 'GND,RXD,TXD,VCC' on the gsm module.On the other hand there is VDD pin also.So which one i suppose to connect to the logic level conver in order to interface with PIC 18F46K22 ?

2)In the tutorial of interfacing between Siemens TC35 gsm module and SK40C, it was stated that we could straightly connect the gsm module with pic without the logic level converter.Can i connect my gsm module directly to pic 18F46K22 ?

Hope you could answer all my question and thank you very much.

Hi, you can check the User's Manual of TC35

If you are using Rev2.0, you should connect to the VCC.

Currently i am doing accident notifier where once accident it sends sms using TC35 development board to certain numbers.I have connected the gsm to the pic,but the expected result doesn't come out. I use the Rev. 2.0 and use a logic converter to interface with a pic.But the sms is not being sent.Hope anyone could help me.

karthi06 WROTE:Currently i am doing accident notifier where once accident it sends sms using TC35 development board to certain numbers.I have connected the gsm to the pic,but the expected result doesn't come out. I use the Rev. 2.0 and use a logic converter to interface with a pic.But the sms is not being sent.Hope anyone could help me.

If you are using Rev.2.0, why logic converter is needed? Which figure do you refer in the User's Manual?

karthi06 WROTE:Currently i am doing accident notifier where once accident it sends sms using TC35 development board to certain numbers.I have connected the gsm to the pic,but the expected result doesn't come out. I use the Rev. 2.0 and use a logic converter to interface with a pic.But the sms is not being sent.Hope anyone could help me.

If you are using TC35 rev.2.0, why is the logic converter is needed? Which figure of interface are you referring to in the User's Manual? Can you show us?

I refer to the image shown in tutorial.Does the Rev 2.0 means thaat it has 4 UART pin,VCC,GND,TXD,RXD ?
If yes how would i connect it to pic ?
Hope you could ans my questions.
Thank you.

Mind sharing the photo of your TC35 GSM board? I am curious to know what is the reason for you to get confused, because we are trying to be clear in the User's Manual and showing picture (top and bottom) of both version of TC35 GSM modem, also the interface to SK40C which is PIC microcontroller.

The interface to SK40C with the TC35 ver2.0 is shown in page 13 of User's Manual

Previously i referred to user manual of October 2013.That's why i get confused.Anyway, when i connected the gsm module to pc and tried my coding,it does send sms.However,when i connected it to pic in hardware nothing happens.May i know why this happens ? Hope you could solve my doubt.

Thank you.