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USB UART and USB to Serial (RS-232) adapters<br />
A USB UART adapter is used to access the serial console of the Raspberry Pi from a<br />
development host such as a laptop or desktop PC. The USB end connects to the PC and<br />
the UART header end connects to the USB. While it is possible to connect the USB end<br />
to another Raspberry Pi, this configuration has not been tested unless explicitly<br />
mentioned against an individual entry below.<br />
▪ FTDI<br />
▪ FT232 chip based adapters works for some people but others find it hangs Linux<br />
when the port is opened. module is ftdi_sio<br />
▪ ▪ FT2232D dual RS232/FIFO works (used in various JTAG devices)<br />
▪ Prolific<br />
▪ PL2303 chip based adaptors works fine on latest Debian tested with minicom and<br />
gtkterm<br />
A USB to Serial (RS-232) adapter is used the other way around, ie. the USB end connects<br />
to the Raspberry Pi and the RS-232 end (DSUB-9 or DSUB-25 pin) to the other device<br />
which may be another computer, (old) modem or printer, or some electronic test<br />
equipment.<br />
▪ "Best Connectivity" (Possibly also sold under the "Newlink HQ" or "Kenable HQ"<br />
labels)<br />
▪ FG-U1232-PL2 Based upon the Prolific PL2303X chipset and listed by lsusb as<br />
ID 067b:2303 Prolific Technology, Inc. PL2303 Serial<br />
Port. Appears as /dev/ttyUSB0, and requires the user to be a member of the<br />
dialout group (which pi is for Raspbian Wheezy). Initially tested using an old RS<br />
Datalinker setup in "loopback" mode via microcom upto 9600 baud, and gtkterm<br />
after installing that from source code. All handshake lines toggled as expected<br />
and no characters were lost. Subsequently gtkterm was used to check bidirectional<br />
communication with an ancient brother EP44 electronic typewriter (as<br />
a printer/dumb terminal) at 1200 baud. Signal lines were again monitored with<br />
the Datalinker.<br />
Other, exotic USB devices<br />
USB to Parallel Port/Printer Adapters<br />
▪ Prolific<br />
▪ PL2305 Chipset with Centronics 36w connector. Originally purchased for use<br />
with a netbook and connected to an old Canon BJC-250 printer. Worked fine<br />
under RISC OS Pi with its in-built BJC-250 driver. Could not install the CUPS
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