Copy Printers; Terminal-Attached Printers; Modem Operations; Using The Alt Key As The Ascii Control Key - IBM 3174 Reference Manual

Nonescaping Keys
Copy Printers
The copy printer operation (using the 3270 PRINT key) works with ASCII hosts just
as it does in normal 3270 sessions, except that IDENT (used to alter the printer
address) must be done in 3270 mode. The copy printer operation is normally
limited to display stations and printers both operating in 3270 mode. However, this
support is extended to allow a 3270 terminal operating as an ASCII terminal to
perform a local copy. The target printer must be in 3270 mode, and the IDENT
process that is used to alter the copy printer assignment (if necessary) must be
done while the 3270 terminal is in 3270 mode (connected to a normal 3270 host or
the Connection Menu).
Terminal-Attached Printers
Some IBM terminals can have directly attached printers. When you are using this
type of IBM terminal to communicate with an ASCII host, the host cannot
communicate with the attached printer. You can only use the printer to print
screen images from the terminal. The information on the terminal is sent from the
terminal to the printer.
Modem Operations
When you select an ASCII host from the Connection Menu, the host is usually
called automatically. This means that when you select an ASCII host with stored
dial digits, the 3174 control unit selects a port that can get to the host. The call is
placed by sending the dial string to the modem attached to the port.
You can manually dial an ASCII host by typing the dial digits at the keyboard.
When you select a host that must be dialed manually, the 3174 selects a port that
can get to the host and establishes a connection between the terminal and the
modem as if the modem were a host on a direct connection. You can then type
commands to the modem and receive its responses.
Using The ALT Key as the ASCII Control Key
When the 3174 is customized to use the ALT key instead of the CTRL key as the
ASCII control key, some functions are limited or operate differently. See your
system administrator for your 3174 customization information. This provides an
interface to use your 3270 terminal as an ASCII terminal that is the same as the
interface provided in microcode releases prior to 3174 Release B2. Following are
limitations associated with using the ALT key as the ASCII control key:
• You cannot use your 3270 terminal as a Data General Dasher D210 or a DEC
VT220.
• Extended Graphics characters are not supported.
• Control mode and Control Shift are not valid.
• Modified keyboards are mapped as if the keyboard were not modified.
• Control Indicator is not displayed in the OIA.
Nonescaping Keys
Processing an accent character in Extended Graphics mode, or from the main
keyboard in most languages, places the keyboard in nonescape mode. (In ASCII
documentation, this mode is sometimes referred to as dead-key processing.)
Pressing the accent characters causes an indicator to appear in the OIA showing
which accent character was pressed. The cursor on the screen does not move.
Chapter 2. Using a 3270 Terminal to Connect to ASCII Hosts 2-3