Protocol problem

Dear Experts
I am using hardware device PG-2750C with my application (Developed in VC++).But I am unable to know the protocol that device uses. I have tried very much but I am unable to detect its protocol. If you want to know about hardware device that I am using then click the link

bellowhttp://caddx.theshoppe.com/PG2750.html
and see only PG-2750C(LCD Display). Because I am using
this device.
Due to this I am unable to communicate with my application.Moreover I am using createfile() and maskcomm  tecnique to open COM port. Any suggestion will be warmly wecomed.
I have also checked it with Hyper terminal and tera term pro emulator type things.
Thanks in Advance                                                    
LVL 4
habibbAsked:
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jkrConnect With a Mentor Commented:
If you have a sample program that communicates with the device, try http://www.sysinternals.com/ntw2k/freeware/portmon.shtml to find out about the protocol it uses.
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habibbAuthor Commented:
Dear jkr very nice to you. I have succeded half but not checked further and also it will take sometime to confirm however I hope it will help me great so again thanks and hope 300 are your.
if you have some other comments or answers then plz tell it to me.
Best regards
habibb
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jkrCommented:
Sorry, no other hints - you will have to 'reverse-engineer' the communication by yourself...
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jkrCommented:
Hmm, anything else you need to know or could we close this question?
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habibbAuthor Commented:
Actually I am waiting for master card as I get master card I will check all protocols that I have written by portmon. So plz wait I am also hanging up due to lack of master card.
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jkrCommented:
OK :o)
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