6530 Programmer's Guide

Block Mode Operation
6530 Programmer’s Guide 3-63
Read VTLAUNCH 6530 Configuration Parameter
( Esc - g )
The Esc - g escape sequence provides a mechanism for the host to
identify the connected 6530 in Virtual Terminal Launch (VTLAUNCH).
Host programs that have knowledge of various emulators can use this
information to provide extended support for those recognizable devices.
The Esc - g sequence causes the 6530 to transmit the current string values
of its supported configuration parameters. Only parameters 2 (terminal
type) and 3 (operating system version) are supported by the 6530.
A syntax error in the escape sequence causes the 6530 to ignore the
sequence and return no response.
The Escape sequence has the following format:
Esc - pn g
where:
pn is the parameter number (an ASCII numeric character)
0 = all 6530 parameters in order 1-6
2 = 6530 type
3 = operating system version
The return message has the following format:
SOH ( string DC2 [ string DC2]... terminator
where:
SOH is a control character (01H) that acts as a start of header for
messages returned to the host.
( is left parenthesis (28H).
string is the ASCII character string value for the parameter(s) to
be set. When all seven parameters are set, their string values must be
listed in the order specified by pn. The 6530 truncates any string
values that exceed the maximum length allowed for that parameter.
DC2 is a control character (12H) that acts as a delimiter for the string
values.
terminator comprises the control characters ETX (03H) and
LRC (Longitudinal Redundancy Check) in block mode.