I have built the adapter but when I measure the voltages from the board they are all near zero. What is wrong?
The voltages will appear on board only if some program is using the corresponding COM port. For basic measurements and tests you can use a general-purpose terminal program like HyperTerminal. See the chapter 3 for details. • Voltages on my dual cable are higher than on an FBUS cable. Is it ok? The voltages may be higher with a terminal program in a dual-mode adapter than in a single-mode adapter. Most terminal programs assert both DTR and RTS simultaneously, and in Nokia software assert only DTR with FBUS and only RTS with MBUS. It is not a problem. • I have used much more common BS170 FET instead of the specified BF245. Why my dual-mode adapter does not work? You have totally wrong component in your circuit. The BS170 is an N-channel MOSFET, and the dual-mode circuit cannot operate with a MOSFET (because the substrate is usually connected to the source pin in MOSFETs making them asymmetric). The circuit requires a symmetric N-channel FET [Philips1996][Siliconix1997] and in general onl
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