IBM 3174 Introduction Manual page 18

Functional Description
ASCII Emulation
The Asynchronous Emulation Adapter provides three major functions:
ASCII terminal emulation (IBM 3270 terminals emulating an IBM 3101 Display
Station, a DEC VT-1001, or an ASCII printer for connection to ASCII hosts or
public data networks)
3270 terminal emulation (ASCII terminals emulating an IBM 3178 Display
Station Model C2, 3279 Color Display Station Model 2A, or 3287 Printer Model 2
for connection to an IBM host)
ASCII passthrough (ASCII terminals connecting to ASCII hosts or to public data
networks).
The Asynchronous Emulation Adapter supports character-mode, asynchronous
transmission of 7-bit ASCII (ANSI 3.4,1977) data with parity. Odd, even, mark,
space, and no-parity c;:oding are supported. Ports can be configured in
combinations of ASCII terminal emulation, 3270 terminal emulation, or ASCII
passthrough. Each port provides an EIA232D electrical interface and supports
transmission speeds of 300, 1200,2400,4800,9600, and 19200 bits per second
(bps) through modems over switched or nonswitched communication facilities or
through direct connection (without modems).
Terminal: The following display stations are supported for ASCII terminal
emulation: IBM 3178, 3179 (Model 1 only), 3180, 3191, 3278, 3279 (operating in
four-color mode), and 3270 Personal Computers operating in control unit terminal
(CUT) mode.
Keyboard: The IBM typewriter, APL, and text keyboard types are supported
through special keyboard maps for the IBM 3101 and DEC VT-100 display stations.
Printer: The IBM 3230 Model 2,3262 Model 3 or 13, 3268 Model 2, and 3287 Model
1 or 2 are supported for ASCII printer emulation. ASCII control sequences for the
following functions are supported: line feed, form feed, carriage return, bell, and
tab-skip to the next multiple of 8 characters. The 3270 printer in this mode is used
only as a host pri nter.
Host Attachment: ASCII host attachment is through any of the adapter ports, as
specified during customization of the 3174.
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Trademark of the Digital Equipment Corporation.
Chapter 2. Features and Functions of the 3174 Controller
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