Hi,
you can use the ResponseFormat datamember of the ASCII object. If you put e.g. %1s%1s%1s%s you should get the first three bytes into RSV1.txt, RSV2.txt, RSV3.txt and the tail of your string will be in RSV4.txt.
Some other examples how to use the ResponseFormat should be in the online help of the ASCII object.
Hope this helps
Roland