CLI Connection Errors in IBM DB2 v9.5

As stated in the title, I would like to connect to DB2(v9.5) from PHP 5.6, but an error occurred and I cannot connect.

Error Contents

 [IBM] [CLI Driver] SQL0332N Character conversion from the source code page "819" to the target code page "UNKNOWN" is not supported.SQLSTATE=57017SQLCODE=-332

Connected From Information

• Linux Centos 6.7
• PHP 5.6
• ibm_db2 1.9.7

Connecting Information

• Windows Server 2003 R2
• IBM DB2 v9.5

The code set of the target DB is IBM-943, and I was able to access other DBs that were built with Unicode, so I think it's okay with the source environment.

I thought it would work if I could set the UNKNOWN part of the error, but when I set DB2 CODEPAGE in the Windows environment variable and hit the following command, the display didn't change.

 db2set DB2CODEPAGE=943

If you know how to solve this problem, please cooperate.