GPRS data transmission-SIM5218A

[toanfet]

Hi everybody,

I am working with SIM5218A for transfering GPRS data.I have “Hyper terminal “for entering AT command and showing result and “GPRS Sever” (Writen by C#)
I created a TCP/IP connection in following steps:
1: AT+NETOPEN="TCP",6002(6002 is the port of socket)
Respone:Network opened
2: AT+TCPCONNECT="212.124.55.1",6002
Respone:Connect OK
But when i entered AT+TCPWRITE=3 <CR>(3 is length of length of the string)
The Respone was >
Then I wrote abc
The respone :ERORR
IPSEND:255,1
Of course,the data didn’t tranfser

Please Help Me.

Thanks in Advance

 

[toanfet]

All AT-command entered are corect.I I sent the data via gprs success.Some errors occur due to unstable internet connection.
Thanks for listening!