Maybe that, or the data byte configuration is wrong. The 7 data bits seems a bit unusual. I have communicated with about 15 different devices over the course of my LabVIEW programming and 8 data bits is the only configuration that I have encountered. The stop bit is probably 1.0.
Hung, double check the required configuration and make sure that the device decodes the transmission as 7 data bits and not 8 data bits. Also, check the response to see if it is a binary number or an ASCII string representation of the number. If it is an ASCII string representation, i.e. you can read the number with any ol' text editor, then, since a <cr> is required on transmission, I'll bet you can enable the termination character for reading the responses, too. If the number is a binary encoded number, i.e. I32, or a float or something, then you will not be able to enable the termination character. Usually, the device sends a small amount of data, and sends it as an ASCII encoded string.
