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I installed your (great) driver (thank you), and checked that with Zterm I can receive data from a GPS using a PL2303, so I know it works. I am now trying to write a simple C program on Mac OS-X 10.4.11 to read/write to the GPS. When I do an open() on /dev/tty.PL2303-4B14, the program blocks (an stty on /dev/tty.PL2303-4B14 also blocks). The open() on /dev/cu.PL2303-4B14 works and I can set speed with tcsetattr(), but then subsequent read() calls to get data do not return anything. Obviously I am missing something. What is the difference between the cu and tty versions of the device? Why does the tty version block on open() or stty? Can't I use open(), read(), write(), close() to get data in and out of this device on Mac OS-X?
For information, here what the ioreg gives me for this device:
+-o IOSerialBSDClient <class IOSerialBSDClient, registered, matched, active, busy 0, retain count 7>
"IOTTYSuffix" = "4B14"
"CFBundleIdentifier" = "com.apple.iokit.IOSerialFamily"
"IOClass" = "IOSerialBSDClient"
"IOTTYBaseName" = "PL2303-"
"IOSerialBSDClientType" = "IORS232SerialStream"
"IOProbeScore" = 1000
"IOResourceMatch" = "IOBSD"
"IOMatchCategory" = "IODefaultMatchCategory"
"IOTTYDevice" = "PL2303-4B14"
"IOCalloutDevice" = "/dev/cu.PL2303-4B14"
"IODialinDevice" = "/dev/tty.PL2303-4B14"
"IOProviderClass" = "IOSerialStreamSync"
Thanks in advance for your help!