[foxboro] Float Star Communication with DCS

We have problem in establishing DCS communication with Float star.
Setup is as follws:

The process control software (Kepware) resides on a standalone windows 2000 
computer (this is a server machine). The SA 85 card is configured on this PC as 
well. The communication to be established is with DCS via Modbus Plus. Dcs is 
Master and the (Kepware)Floatstar is Slave. All requests are initiated from 
DCS. The holding registers in the Floatstar is 400001-40000*. The device ID of 
Floatstar is DS.1.0.0.0.0. which means Device ID is 1.
When we switch ON the compounds, the ECB Fails with time out errors, indicating 
no response from the SA85 card. 
We spoke to local Schneider assistance and they categorically stated that SA85 
status as Master and cannot be changed - ever.
Also we found that we can chage in Kepware software from Master to slave.But we 
are not definitely sure that the card assumes slave role, ie., on both sides of 
the connection - not just in it's relationship to Kepware connection - but also 
in the SA85 to the rest of the Modbus Plus relationship?
Could somebody tell us this communication has been physically done in a known 
plant?
If so, please help us

thanks 
suman
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