The Repeat to Address (RA) order compacts the data stream by eliminating repeated characters, specifying the ending buffer address and the character to be repeated. The RA order can be used at any point in the data stream and can be used within a field at any point in the data.
The RA Order, address, and character are four bytes long. CA Gen uses the RA order when the repeated data exceeds four bytes.
The RA Order can be inserted any number of times into a stream of data, even when the data is for the same field.
For example, the string:
AAAAAAABBBBBBBCCCCCCC
Can be reduced to:
SA addrA SA addrB SA addrC
Where the address in each case indicates the buffer address of the last occurrence of the repeated character. This example saves nine bytes in the data stream. When combined with other fields, the savings can be significant.
When the RA order is suppressed by the user, the runtime does not reduce repeated strings. Instead, the runtime software sends the entire string unchanged to the device.
To suppress the RA order, modify the Screen Table in the generated screen manager program. Add 4 to the value currently shown for the Data Stream Options.
Suppressing this feature may make it possible to use non-IBM 3270 systems that do not support this order.
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