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The LaunchPad includes a pre-programmed MSP430G2553 device [...] Press button P1.3 to switch the application to a temperature measurement mode. [...] The collected temperature data is also communicated via back-channel UART through the USB emulation circuitry back to the PC. The transmitted values [...] can be displayed with any terminal ...
It seems like your launchpad's EZ-FET is broken. It is not stable, and by some reason, it becomes broken easily. Try to reset the firmware of EZ-FET by running, $ mspdebug tilib , and then try your commands again. I've experimented with several MSP programmers before. The EZ-FET included in Launchpads were unstable for external usage.
6. They are similar concepts in that they both measure a rate of a thing, but not the same. Hz, or hertz, means cycles per second, and is a measure of frequency. bps is "bits per second", or less frequently "bytes per second". The relationship between the two will depend on how a bit is encoded.
If you try to use 9600 bps rate with 32768 Hz clock, it is not possible, the actual baud rate will be faster, 10923 bps. That is 13% faster than requested 9600 bps, and thus out of tolerance requirement for receiver operating at 9600 bps rate.
Because of the serial interface, you may be limited to as low as 115,200 bps, certainly no higher than 1 Mbps, which is not even as fast as the slower USB 1.1 rate of 1.5 Mbps. However on the slave side, you will need to implement a USB host to talk to the slave USB interface.
It cannot be 1 to 1 because, 115200 bits per seconds is 14.0625 KBps (kilo byte per second), which is too slow. A UART simply encodes 1 as a high voltage level, and 0 as a low voltage level. For a 'normal' UART, baud == bit rate, so 115200 baud = 115200 bit rate = 11.520kBps (assuming 8N1 which means 8bits data + 1 start bit + 1 stop bit).
56K bps is the limit for an analog telephone line. The higher rates 115200 upwards (once again doubling starting at 57600) are used for hard-wired connections. As mikeselectricstuff mentioned, 14400 and 28800 bps were introduced as 1.5 x 9600 and 1.5 x 19200 when modems speeds couldn't be doubled at the time, but are seldom used anymore.
In order for asynchronous serial data to be received correctly, the original clock must be recreated at the receiving end. A rule of thumb for serial links is that if the clock rates are off by more than 3%, you'll get errors much like the ones you describe. So at a rate of 460,800 bits/second, that's a little over 2.27 s per bit.
3. The data rate in any communication channel is equal to the Symbol Rate if there is 1 bit per symbol. For any multi-level coded channel (where there is more than 1 bit per symbol), the symbol rate is simply the data rate / bits per symbol. In this case, there are 4 bits per symbol, the data rate is 9600 bits per second and the symbol rate is ...
In the first case the bit rate will be 60 bps, as the "0V's" and "5V's" are switching 30 times a second. In the second case the bit rate will be a maximum of 660bps, (if the threshold switching voltage of the receiver is exactly 2.5V), and slightly less if the threshold voltage is different.