You can use the conversion information service to obtain information about details of one specific coded character set identifier (CCSID) or two CCSIDs. Use the conversion information service separately, or use the service before the z/OS® Unicode character conversion service. The conversion information services are called using a stub routine named CUNLINFO for AMODE (31) and CUN4LINF for AMODE (64). Callers for conversion information service must provide at least one CCSID to obtain the following CCSID information:

• Encoding scheme ID and encoding scheme name
• Encoding Minimum size and maximum size
• CCSID description
• Number of substitution characters and these substitution characters
• SubCCSIDs information (if any)
• Supported CCSID or unsupported CCSID

When two CCSIDs are provided, and these CCSIDs are supported, conversion information service returns the techniques supported between those CCSIDs in addition to the CCSID information for each one of them.