z/OS Communications Server: IP IMS Sockets Guide
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Data translation

z/OS Communications Server: IP IMS Sockets Guide
SC27-3653-00

The IMS™ Listener tests the initial input data string (the TRM) to determine whether the terminal is transmitting in ASCII. If the terminal is transmitting in ASCII, and the transaction is defined as implicit-mode in the TRANSACTION configuration statement, the Listener translates the ASCII application data into EBCDIC.
Note: When data translation takes place, the entire application data portion of the segment is translated from ASCII to EBCDIC, and vice versa; therefore, the segment should contain only printable characters that are common to both character sets. (For example, the EBCDIC cent sign and the ASCII left square bracket are both printable in their respective native environments, but they are not translated because they do not have an equivalent in the other character set.)

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