I am having trouble getting communications set up with a Raven 460 monitor. I purchased a null modem cable from our local computer store( will this work or do I need a special cable). When I select rev a-h there is nothing at all that happens, when I select rev J it changes the rate on the raven to over 500. The tag on the back of the raven is not marked with a revision letter but is program E. This all takes place with the log without control checked. My next question is if you want to log without control, can you create a field boundary while doing so?