dashie@ubuntu-shared:~/pikon$ ./pikon fire_shutter
20:01:08 INFO  src/nikonDatalink.cpp:36: Starting session.
20:01:08 INFO  src/nikonDatalink.cpp:133: libserialport version: 0.1.1
20:01:08 INFO  src/nikonDatalink.cpp:134: Port name: /dev/ttyUSB0
20:01:08 INFO  src/nikonDatalink.cpp:135: Description: FT232R USB UART - A50285BI
20:01:08 INFO  src/nikonDatalink.cpp:169: Identifying camera...
20:01:08 INFO  src/nikonDatalink.cpp:170: Sending wakeup string...
20:01:08 INFO  src/nikonDatalink.cpp:181: Sending nikon inquiry string...
20:01:10 INFO  src/nikonDatalink.cpp:181: Sending nikon inquiry string...
20:01:10 INFO  src/nikonDatalink.cpp:57: Camera is a N90s/F90x
20:01:10 INFO  src/nikonDatalink.cpp:645: Triggering shutter
20:01:10 INFO  src/nikonDatalink.cpp:79: Ending session.
dashie@ubuntu-shared:~/pikon$ 

It does successfully trigger the shutter after doing focus. Standalone focus command still doesn't work, nor 9600 bauds negociation.