minerd --gc3355=/dev/ttyACM0 --url=stratum+tcp://sf.clevermining.com:3333 --user=1M698hKVYQ9h5zEntcUetp84t4Eq3xetfd --pass=x -P

minerd --version
cpuminer 2.3.2
libcurl/7.19.7 NSS/3.14.0.0 zlib/1.2.3 libidn/1.18 libssh2/1.4.2

Here is the output:

[2014-04-05 10:55:20] Stratum detected new block
[2014-04-05 10:55:21] dispatching new work to GC3355 LTC core
>>> LTC : 55aa1f2810000000
>>> LTC : 55aa1f2813000000
>>> LTC : 55aa1f00000000000000000000000000000000000000000000000000000080ff7f0000008463409 1806acf3e5281d91177f758a9495700f1a2c3dceb843fb9a136bff83c000000020e9b315c44677a c116d5a4c500f34310b00aa662091ae0ed61e65a5b34dfead558791233f2da3253a07ea14e15dac fe196091dcb0137a5cadf7a6f987d9f0c9b534035781b3e07d600000000ffffffff


(Similar data repeats every few seconds or so)