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No. 717	Re: CSE-M53 sio buffer	2013-02-01

Hello. This is a technical support team of Sollae systems. Data loss might occur because of the a difference between LAN and Serial speed. I recommend you use the flow control. Here are answers. 1. SIO RX buffer? -> 2048 bytes 2. Is there a way to visualise errors such as buffer overflows ? to visualise the actual number of bytes in this buffer ? -> if you click the [Status] button at ezManager, you can see the count of sio_rx. Please check the sio_rx count and send data size. If it is not the same, data loss might occur.. And you can see the net_tx count, it is the actual number of bytes. 3. flow control mechanism -> nearly full. when the empty space less than 1/4(512bytes) in RX buffer, RTS pin will be active. And then if empty space remain over 3/4 of buffer size, RTS pin will be inactive. 4. would the module continue to accept data for a while? -> yes, buffer has a empty space, if not data loss might occur too. Have a nice day. Thank you. > Jean Taeymans wrote: > ------------------------------------ > Dear, > > I am using the CSE-M53 in TCP-server mode with a almost continuous stream of data at 230kbaud (some 17.5kbytes/s, 75% of the theoretical capacity) and no flow control over a 100Mbit/s LAN. > I notice that entire data chuncks are fairly often lost, without any TCP error at the client side. Can somebody comment about the depth of the sio rx buffer ? Is there a way to visualise errors such as buffer overflows ? to visualise the actual number of bytes in this buffer ? > Is there a description of the flow control mechanism (in the non Telnet RFC2217 mode), i.o.w. when is the RTS asserted ? : when the rx buffer is full ? nearly full ? would the module continue to accept data for a while ? > > Best regards, > Jean.

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