Missed attaching the file..
Can you please report your sybase-service.xml file with the 'charset'(iso_1) as a connection parameter. I have tried to set it and have not succeeded.
On another topic. Have you had any problems with the log segment when working with Sybase. I am getting error about the log being full during my transaction, even though I have set the "trunc. log on chkpt." option set. Any comments are welcom.