Scada Connectivity

[asaleem]

Dear All,

I have conected Scada over Cisco 2621 using Async protocol in BSTUN but Traffic is going one Way.

Anybody Know BSTUN with Async Protocol with Local Acknowledgement Feature.

Rgds,

[jihicks]

Good Afternoon,

With roles coded, it does look like local-ack, but BSTUN for SCADA ( async generic ) is not local-ack.

The SCADA device is not answering the poll, maybe because it should be more than 5 bytes.

Add these statements to the serial interfaces on both sides:

async mode dedicated

asp ignore-sequence-number

Change the role on BOTH sides from primary to secondary:

asp role secondary

Usually, the host side would be secondary and the remote side primary, because this is the router's role. We had to make this secondary on both sides for one customer to work correctly.

And finally, I am used to seeing about 14 bytes of data on the receive for a poll, wonder if the rx-ift is not too small. Your debugs show only 5 bytes. Try changing this also:

asp rx-ift 20

You may have to try different values for rx-ift to find the one that works for you.

Best regards,

Jim

[asaleem]

Dear Jim

Thanks for All support But the commands async mode dedicated and asp ignore-sequence-number doesn't worked at all . If the scenario is working at other peer there must be something more they have done to get 14 bytes packets in async line configuration becoz im getting only 5 bytes.

Kindly check if you can get some answer.

[asaleem]

Dear Jim

Thanks for All support But the commands async mode dedicated and asp ignore-sequence-number doesn't worked at all . If the scenario is working at other peer there must be something more they have done to get 14 bytes packets in async line configuration becoz im getting only 5 bytes.

Kindly check if you can get some answer.

[jihicks]

Good Morning,

The problem is that we don't know how many bytes your implementation of SCADA uses. You are seeing 5 bytes no matter what we change. This may be correct. The reason we suspect it may not be correct, is that the data is being sent out the far end to teh RTU and it is not answering. The RTU was connected to a multiplexor via a DTE cable if I understand correctly. Now the router cable is plugged into RTU. Please try using the DTE cable from prior connection and plugging to DCE cable from router, use both cables.