Each T16 interface comes from the factory with a preset destination address. Each time you need to communicate with the T16, you have to first send the destination address. If the destination address doesn't match, the T16 ignores your communication and does not respond. So it's important to know your destination address. If you do not know it, PCMSCAN provides a T16 detection feature for you.
The reason that the preferences dialog provides boxes for entering the destination address in both hex and decimal is because some people only know the hex number or the decimal number of the destination address.
Feel free to download our demo version and play around with it. Let me know if you have any troubles getting connected and I'll help you out.