ASCII Passthrough
Printer: The general requirements
for
ASCII printers to be supported
for
3270
printer
emulation
(LU1
SNA character string [SCS] mode
and/or
LU3 3270
Information Display System
data stream
compatibility
[DSC] mode)
are
as follows:
• Serial
transmission
• Equal
transmit
and receive speeds, which must be in the range of speeds
supported on the
emulation adapter
• Duplex character mode
•
7-bit code defined by ASCII (ANSI 3.4, 1977)
• EIA 2320 electrical interface
• A
maximum
of
132
print
positions
• ASCII commands supported:
Carriage
Return (Control
M;
hex
00)
- Line Feed (Control
H;
hex OA)
- Bell (Control
G;
hex
07)
•
Carriage
return must not generate a line feed, nor can a
line
feed generate a
carriage
return.
• The
printer
must not be dependent on any delay characters to
allow
mechanical motion.
Printers connected in this mode can be used as host printers, shared printers, and
local copy printers.
Host Attachment: IBM host attachment
is
through the host attachment interface of
the 3174 in which the adapter is
installed.
Operator Indicator Line: Operator
indicator
status is provided upon request on the
24th
or
25th line of the ASCII
display
station.
RTM and Alert: Network statistics
for
ASCII
terminals
are
gathered in the same
manner
as 3270
terminals
connected to the 3174.
The
emulation adapter can provide the connection between an ASCII
terminal
and
an
ASCII host, using any ASCII host-configured port. Flow
controls
supported by
the adapter
will
prevent potential data
overruns
if supported by the host
connection.
If an overrun does occur, a message is sent to the
display
station
operator.
Error
checking is the responsibility of the ASCII host.
General
Items Common to ASCII and 3270
Destination Menu: Prompts help the user
determine
how to connect
with
the
desired host
application.
Modems: Supported
are
all unswitched-line, limited-distance, and switched-line
modems that provide
duplex asynchronous operation, support equal
transmit
and
receive speeds, and conform to
EIA232D specifications on pins 1 to
8,20,
and
22.
Connections can be made through
"smart"
modems, such as the IBM 5841.
Transmission
on/transmission
off (XON/XOFF), data
terminal
ready (DTR), and
clear
to send (CTS) asynchronous
flow
controls are supported.
Chapter
2.
Features and Functions
of
the 3174
Controller
2-5
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