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How to read several Modbus commands and respond

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My setup is as follows:
An rs485 device sends a request to a xbee coordinator that sends it to a router and this one to another rs485 device.
My problem arises when the device linked to the coordinator sends requests faster then 1/second. Sometimes it sends the request but is unable the get the answer. So there isn't like a request/response sequince, sometimes it sends 3 requests and then gets 3 consecutive answers.
This is only if the coordinator is in broadcast mode, but i need it to be this way because i want to use 5 routers.

Update: I have set up a point to point connection: coordinator to router. Now the speed is almost good but i still send 2 packets before receiving the first one. I mention that the rs485 device send it's request at about 48ms. Still isn't solved.
asked Mar 18, 2015 in Modbus and Industrial Automation by ene.dragos.george New to the Community (1 point)
edited Mar 25, 2015 by ene.dragos.george

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