Vb communication with GSM

<pre>Station1->plc1->modem1--
station2->plc2->modem2---
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PC Engineering station--->Internet-- |
Vb coding |
Communicating with Station1&2 |
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Please Provide VB coding for this application.

We want help for PLC communication with GSM mode on VB which is install on our another engineering station which is communicate through web.

Project view :-two plc station which is connected to GSM modem and modem communicate with engineering station.