I'm using an external power source to power an MBED module. I have the UART transfer and receive ports connected to a MAX232 level switcher in order to make the signals compatible with RS232. From there the wires go to an RJ-45 connector, which goes to a DB9 connector that is connected to a USB-DB9 converter. This is connected to the laptop.
With this setup, I should be able to program the CPU to write text which will appear in a terminal program like HyperTerminal in Windows? I've tried several things, but haven't been able to get any input in HyperTerminal. I can get it to work if I use a USB connection though.
I've already checked that everything is powered and grounded. I've also checked the connections. What can I do next to figure this out?