6530 Programmer's Guide

Block Mode Operation
6530 Programmer’s Guide 3-67
ov = An ASCII 1 to indicate that one of the buckets has reached the
maximum count, or an ASCII 0 to indicate that no bucket has
reached the maximum value of 65535.
ETX LRC is a control character (0DH) that terminates the message.
PFKey Support PFKey support is supported in block mode and EM3270 mode. PFKey
support makes it possible to read a function key press and the associated
screen data in a single read instead of the previous method of performing
separate reads for the function key and the data.
The next section, “EM3270 Support,” provides details about PFKey
support, escape sequences, and responses.
EM3270 Support Your terminal’s reply to the Read Configuration escape sequence (Esc ?)
indicates its ability to support the 6530 enhancements which provide
emulation of IBM’s 3270 family of terminals.
Set EM3270 Mode (Esc - m)
The Set EM3270 Mode sequence is used to enter or exit PFKey or
EM3270 mode only while the device is in the protect submode of block
mode.
The Set EM3270 Mode sequence enables an enhanced function key
response, which includes both an FKEY response (standard) and a Read
Modified response.
On entry to protect submode (Esc W) or after a reinitialize (Esc q), all
pages are reset to normal mode. PFKey and EM3270 mode are enabled or
disabled using the following sequences. The format of the sequence is as
follows:
Esc - mode m
where:
m = 0 designates set current selected page to normal mode
= 1 designates set current selected page to EM3270 mode
= 2 designates set ALL pages to PFKey on
= 3 designates set ALL pages to PFKey off
EM3270 mode is enabled or disabled one page at a time, while PFKey is
enabled or disabled for all pages or no pages.