NCR 7800, User Manual, Page: 75 / 112

563UHIL[%\WH
8VHUV*XLGH
RS-232 Prefix Byte
Controls the use of prefix bytes. If you use an RS-232 Prefix
Byte, it is the leading character in each message sent to the
host terminal or PC. Following it is the message data which
may include a message VLI as its first byte.
Contains two selections: Disable and Enable. Scan the Hex 0
tag to disable the Prefix Byte or the Hex 1 tag to enable it.
The default is Disable.
When selecting RS-232 Direct communications
protocol, the Prefix Byte option is enabled.
Specifies what ASCII code to use for the Prefix Byte. Enter
your selection by scanning the two appropriate Hex tags, as
listed in the ASCII Code Chart in Appendix A. Although you
can select any value from 00 to 7F (Hex), the Start of Text
(STX) ASCII Code (Hex 02) is recommended. If do not use
Hex 02, 01 - 0F (Hex) are recommended. Scan the two
appropriate Hex tags (Hex 0 through Hex 7 for the first
character and Hex 0 through Hex F for the second). The
default is 02.
Prefix Byte
Note:
ASCII Code