I am using GDW-11 of WESTERMO make for GPRS connectivity. I am not able to connect to PLCS using GPRS. I am using SIM cards with static IP addresses. Can anybody provide modem configuration for this application?
I read the specification of GDW-11, i guess you make the wrong decision to use the common GPRS modem for your application.
my question as below:
1) your SIM card binding with a static IP address, i guess you have apply the VPN business with your local mobile phone service provider. but how do you keep the internet connection between your PLCs and your SCADA ? use TCP/IP protocl and maintain a socket? your plcs or your GDW-11 could provide port number for listening to your SCADA?
2) When your GDW-11 detach from GPRS network,how do you deal with it? your plcs could sent AT command to re-dial-up in order to maintain the conncetion automatically?
3) Does your SCADA have static IP address?
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you could sent me a e-mail to me, i would like provide some technical documments for your reference.
my e-mail is : [email protected]
I've recently bought 5 Westermo GDW11 modems.
My goal is to connect (through GPRS) 4 remote stations with Omron PLCs to a central station (also with an Omron PLC). In this case, the autoconnect feature doesn't work, because I want the server to receive data from all the clients (usually alarm information). How can I do this? How can I make a manual connection from a client to a server without using the autoconnect feature?
All my modems have a software revision "SW version: 4100-9401"
I've also checked that the online manual from westermo.com has some extra commands that are not included in my CD.
I'd appreciate a fast answer on this, because I'm running out of time to implement this project!
Based on your description, generally, first you should setting your Central Station (Omron PLC) as the TCP Server, that would setup socket with your remote station for data transmission. Your remote station will regard as the TCP client. So you should make the configuration for your PLC, and let your PLC could output AT command to your GDW11, such as setting TCP server sever IP address; setting port number for TCP client listening, etc., you could check their AT command list for detail. I noticed that your SIM card binding with static IP address, maybe your TCP server should provide different port for listening for your remote station. Then you set remote PLC with GDW11 modems as the TCP client, and configure the server IP, port number in order to initial a socket with your TCP server.
I do not know what's the meaning of autoconnection, would you explain it for me?
For manual connection, from my understanding, if you attached your GDW11 modems with your PC, it is easy, just running the hyperterminal, just type like ¡°at+CSQ¡±¡¦¡¦¡¦.
> I've recently bought 5 Westermo GDW11 modems.
> My goal is to connect (through GPRS) 4 remote stations with Omron PLCs to a central station (also with an Omron PLC). In this case, the autoconnect feature doesn't work, because I want the server to receive data from all the clients (usually alarm information). How can I do this? How can I make a manual connection from a client to a server without using the autoconnect feature?
>
> All my modems have a software revision "SW version: 4100-9401" <
I do not know about that software, it maybe makes the configuration for your GDW11 modems.
I have some questions below:
1. How do you deal with when your GDW11 modems detached from GPRS network? How to make the reconnection to GPRS networking?
2. Does your PLC could release socket automatically when it has no data exchange between your central station with your remote stations?
3. Assume your TCP server have setup TCP connection with your remote TCP client and have the data exchange, how does your Omron PLC deal with the data got from socket?
Am facing the same problems as you had using the autoconnect feature on GDW11 modems. Did you have any luck with this autoconnect feature???? Awaiting your reply. You can mail me at salim @ nie-kwt. com.
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