I have problems in FBUS communications with the dual-mode adapter. How to start searching for the reason?
To start solving your problem, try to disconnect the D or S of the FET Q1 to make the adapter FBUS-only and try again. Also you can try holding the FET connected and adjusting the R3 to be larger than the specified 10k. If this helps, there may be something wrong in the RTS circuit or the FET type is incorrect. The problem may be in your computer and the application together – if your computer supplies lower RS 232 levels and if the application powers the adapter more sparingly, it is possible that the adapter will not be powered properly. Test using a 4.5 V – 9 V battery between V+ (pin 2) and GND (pin 15) of the MAX232. If this helps, there may be something wrong in the power supply part of the adapter or in the serial port of your computer. • I have problems with my adapter that is only slightly different than yours. How to fix it? I cannot help anybody even with my own circuit design, so I absolutely do not help anybody with third-party circuits. • There is a note that a “null-mode
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