The following 1-byte character encoding systems are supported:
| Character Encoding System | Windows CP | Mainframe CP | UNIX CS |
|---|---|---|---|
| ISO8859-1 Latin1 (Western Europe) | 1252 | *see table below | ISO8859-1(15) |
| ISO8859-2 Latin2 (Eastern Europe) | 1250 | IBM-870 | ISO8859-2 |
| ISO8859-5 Cyrillic | 1251 | IBM-1025 | ISO8859-5* (iconv) |
| ISO8859-7 Greek | 1253 | IBM-875 | ISO8859-7 |
| ISO8859-9 Turkish | 1254 | IBM-1026 | ISO8859-9 |
| ISO8859-8 Hebrew | 1255 | IBM-424 | ISO8859-8 |
| ISO8859-6 Arabic | 1256 | IBM-420 | ISO8859-6* (iconv) |
The following mainframe character encoding systems are compatible with ISO8859-1:
| Encoding System | Location |
|---|---|
| IBM-037(1140) - | USA, Canada, Australia, New Zealand, Netherlands, Brazil, Portugal |
| IBM-273(1141) - | Austria, Germany |
| IBM-274 - | Belgium |
| IBM-275 - | Brazil |
| IBM-277(1142) - | Denmark, Norway |
| IBM-278(1143) - | Finland, Sweden |
| IBM-280(1144) - | Italy |
| IBM-281 - | Japanese English |
| IBM-284(1145) - | Spanish |
| IBM-285(1146) - | United Kingdom |
| IBM-297(1147) - | France |
| IBM-500(1047) - | Latin-1 |
| IBM-871(1149) - | Iceland |
Data Express does not support any additional character encoding systems at this time. This includes any multi or mixed byte character sets for CJK languages, Vietnamese, or any of the various forms of UNICODE, including UTF-8, UTF-16, and UCS-2.