6530 Programmer's Guide

Conversational Mode Operation
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6530 Programmer’s Guide
SPACE represents a space (H20), which must precede the data.
data is the data to be written to the device when a write (40)
operation is specified. A space must precede the data. The data
can be:
• A mode switch sequence that specifies the type of data (Esc a
for ASCII data or Esc b for binary data) to be sent on a
subsequent write.
• ASCII characters in the range of 20H to 7E.
• Binary data specified by pairs of ASCII hexadecimal pairs that
represent single characters in the range of 00H to FFH.
CR is a control character (0DH) that terminates the escape sequence.
See the programmer’s guide for your workstation’s operating system for
more information about writing to a file or device.
Write/Read to File or Device name (Esc } )
The Esc } sequence allows your application to perform I/O operations on
an operating system file or device name. The format of the escape
sequence is as follows:
Esc } “ device” operation SPACE data CR
where:
device is the operating system file or device name to which you
are performing the write/read operation. Note that the device name
must be enclosed in quotes.
operation is one of the following ASCII hexadecimal pairs that
specifies the function to be performed. These correspond to the
same codes used to make operating system calls:
The write/read operation is a composite of an operating system write
function followed by a read. The read status information, however,
is returned in the message described below.
3C = create 40 = write
3D = open 43 = seek EOF
3E = close 42 = delete
3F = read