# PDU MODE

**URL:** <https://forum.sierrawireless.com/t/pdu-mode/3865>\
**Category:** Legacy FX/FXT series\
**Created:** [November 16, 2009, 6:24pm UTC](https://forum.sierrawireless.com/t/pdu-mode/3865 "2009-11-16T18:24:09Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![dapinheiro](https://avatars.discourse-cdn.com/v4/letter/d/f6c823/32.png) [@dapinheiro](https://forum.sierrawireless.com/u/dapinheiro)\
**Post date:** [November 16, 2009, 6:24pm UTC](https://forum.sierrawireless.com/t/pdu-mode/3865/1 "2009-11-16T18:24:09Z")

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Hello,

I have an wavecom fastrack supreme gsm modem. I want to know if I can have access to the pdu conversion used by the modem ?

I’m developing an app in C# with the porpuse of sending and receving sms’s, the problem is that i’ve used the following converter for testing the pdu’s: [twit88.com/home/utility/sms-pdu-encode-decode](http://twit88.com/home/utility/sms-pdu-encode-decode).

With the generated pdu from that website everthing goes smooth and I’m able to retrieve message,sender and smsc, so i decied to try and read an sms from the modem.

The same parameters (message,sender and smsc) are used for both, the modem comes with a diferent pdu from the one generated from the website.

Any help in understanding how the conversion is made in the modem ?

Many thanks