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_ _ LEAR SIEGLER, INC.
DATA PRODUCTS DIVISION
ETX 03 or EOT 04 or CR OD. RTS line is set high
when DCD (carrier detect) line falls, indicating
that (character) transmission is complete. Data
transmission from the ADM 3A takes place when
CTS l[clear
to
send) line from the host is set high.
When, RTS (and CTS from the host) are reset
to
the
marking state, the ADM 3A transmission is
inhibited. The terminal will not recognize any
further commands or codes for approximately 250
milliseconds to allow the host time to propagate its
signal.
3.6 IPROGRAMMING
CONSIDERATIONS
3.6.11 Remote CTRL Operation
The host computer has full control over the ADM
3A. All control operations which are possible from
the kleyboard can a180 be executed from the
computer by transmitting the appropriate CTRL
codes. (Refer to the control and operators codes
chart in Appendix A.) Displayable characters
will be' displayed, and valid control codes will be
recognized and acted upon in the same manner
described for keyboard operations.
3.6.2 Remote Load-Cursor Operation
The co:mputer may command the ADM 3A cursor
to any absolute screen position, as shown in the
a:lbsolute cursor positions chart in Appendix A.
3.6.3 Escape Sequences
I~ach
escape sequence controls a specific terminal
o,peration. The escape sequences recognized by the
,ADM 3A is described in Table 3-5, page 3-12.
3.7 GATED EXTENSION PORT
OPERATION
1'he RS-232C extension port provides a convenient
Dlethod
for
attaching
an
auxiliary
aerial
asynchronous device
to
the ADM 3A. The device
IIlay be an additional CRT terminal; however, a
1I1Ore common application is for a hard copy device
such as a printer. The extension port parallels the
RS·232C modem port, such that any
data
sent to
the terminal through the modem port is also
p,assed through the extension port, unless the port
is disabled using the gating function.
The gating function allows the host computer to
turn the extension port ON and OFF, using
control codes. (Refer to the control and operator
codes chart in Appendix A.)
This
function is
enabled by entering the set-up mode and setting
the SO/SI feature to gate and exiting set-up)
pl'essing
I
CTRL
[R1.
The
I
CTRL
lQ]
commands
disa bles the port.
3-13
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