How long is your timeout value? Perhaps it is not long enough.
You set termination characters for reads. You don't set it for writes. You just append the carriage return or linefeed at the end of the string you write.
(There is a propeerty node that will enable and set the value for a termination character for writes. It just automatically appends that character to the end of every write. It isn't necessary to use. You are better off just putting the character in yourself on the write.)
Write now you don't have a termination character for the read. You could try enabling it and set it for \06. The only problem is that for those occasions where you might get teh NAK (\15), you'll have to wait until the VISA read timesout because teh \06 is not coming. That or begining every VISA read with 1 byte to see if it is the NAK, then if it isn't that or \06, read plenty more bytes as the rest of the string should be a response that will end in ACK.
