ISS 2, SECTION 582-202-200
OPTION NO.
DESCRIPTION
ACTION
h.
Switched Network Providing Device Selection
and
Security Identification J
E
~
A J S D Notes: 1, 2,
a B
AlB
1 C 1 N 0(10(2 A 2 B 2 C 2 C (I T C 3, 4, 5,
Continued from
previous page.
Q K
Xn
and 9
Note
1:
Device selection
is
restricted
to
the printer only
at
this time.
Note
2:
The character code for ENQ is programmable. See Option 159.m.
Note
3:
The [ ] represents Ready
to
Receive (ACKfIJ)/Not Ready
to
Receive (NAK)
replies from
the
ROP terminal. An ACK0 reply
is
required for
the
sequence
to
continue.
ACK(I
is preceded
byala2
in Options 171.d., e., f. and h
..
Note
4:
The sequence starting with STX (optionally SOH) is sent
as
the initial characters
of
the first block
of
a message. In Formats 171.a., e., and h, STX (optionally SOH)
is
also part
of
the
selection sequence.
Note
5:
DC
n
must be coded using Option 159.f. The use
of
Option 159.g.
to
code
Den
is reserved for future applications and may be left uncoded; however, if Option 159.g.
is
coded
(due
to
system compatibility) the terminal
on
receiving a selection sequence containing
the
.character coded by Option 159.g. will respond with an EOT.
If
the
selection sequence fails
to
include
DCn the
terminal will assume
that
the
printer is being addressed. Normally the char-
acters encoded for
DC
n
are chosen from
the
DC
1
through
DC4 category.
Note
6:
The a 1 a 2 are coded using Options 159.a. and 159.b. They represent
the
station
identity. Normally Option 159.b.
is coded identically
to
Option 159.a.
Note 7: The a in Option 171.c.
is
the station identity and is coded using Option 159.a.
The
#
is
the device select character and is coded using Option 159.b. The use
of
Options
I59.c.
or
159.d.
is
reserved for future applications and may be left uncoded; however, if
Option 159.c.
or
I59.d.
are coded (due
to
system compatibility)
the
terminal
on
receiving a
selection sequence containing
the
characters coded by Options I59.c.
or
I59.d. will respond
with a NAK (for 159.c.)
or
an EOT (for
I59.d.).
Note
8:
# must be coded using Option 159;f. The use
of
Option I59.g.
to
code #
is
reserved for future applications and
it
may be
left
uncoded; however,
if
Option 159.g.
is
'coded for system compatibility,
the
terminal
on
receiving a selection sequence containing
the
character coded by Option 159.g. will respond with a NAK.
Note 9: a A a B
Al
Bl Cl
are the LCU station identification characters and are
not
checked. The reply is a 1 a 2 A2 B2
C2
followed by ACK0
or
NAK. a 1 a 2 A2
B2
C2
are part
of
[ ] . (See Note 3.) a 1 a 2 in
the
reply identifies
the
ROP terminal. A2
B2
C2
represents a security identification sequence encoded
by
Options 159.c., 159.d., and 159.e.
See Note 6 for coding
of
a 1
CI
2.
Note 10: a A a B are
the
LCU station identification characters and are
not
checked. The reply is
a 1 a 2 followed
by
the
terminal status. a 1 a 2 are
part
of
[
J.
(See Note 3.)
See
Note
6 for coding
of
a 1 a 2.
Note
11:
ACK0 reply
is
preceded by a 1 a 2. a 1 a 2 are
part
of
[ J. (See
N~te
3.) The
a 1 a 2 in
the
reply identifies
the
ROP terminal. See Note 6 for coding
of
a 1 a 2.
Page
19