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9
Using the Pass Thru mode does not require
the use of dedicated terminals.
The Pass Thru mode of SNA IMF/iX is mot
intended as a replacement for real IBM 3270
devices.
For HP terminals being used in the Pass Thru
mode, the response time will be longer than
that of IBM terminals:
• The data transmission rate between the
HP 3000 and the terminals is slower than
that between the IBM 3270 controller and
its attached terminals.
• For terminals not supported by the write
optimization feature, the screens on the
HP 3000 and Pass Thru terminals are
rewritten any time a change is made. For
small changes, this contributes to an
increase in response time
• SNA IMF/iX uses the Modified Data Tag fea-
ture of the HP 700/94, HP 2394A, and HP
150 terminals in order to accurately and
flexibly handle null and blank characters. In
addition, this may result in improved
response time when compared to other HP
terminals.
• For applications where response time is
critical, please consult your HP Sales
Representative for more information.
• Although the principle functions of IBM
3270 terminal keyboards are implemented -
including Program Function (PF) keys and
Program Attention (PA) keys - there are
some differences:
• Some keys are in different positions, some
keys have different labels, and some keys
are not implemented. Table 2 lists the
major differences between IBM 3270 termi-
nals and HP 2392 terminals.
There are minor logical differences in the way
HP terminals behave. Differences include:
• With Pass Thru mode, only unprotected
fields in which one or more characters have
actually been changed are transmitted to
the host. If a Pass Thru user "modifies" an
Table 2.
3270 Typewriter Keyboard
Program Function Keys
FIELD MARK, TEST REQ,
CURSOR BLINK, ALT
CURSOR, IDENT, DEV
CNCL, DUP, CLOCK, PRINT
and CURSOR SELECT
Keys
PA1, PA2, PA3, CLEAR,
SYSTEM REQUEST
SYSTEM AVAILABLE,
INSERT MODE, INPUT
INHIBITED Indicators
ERASE INPUT, ERASE
EOF, TAB, BACKTAB,
NEWLINE, RESET INSERT
Keys
3270 Characters
cent sign ¢
!
solid vertical bar |
"NOT" sign
unprotected field by replacing the field with
exactly the same characters as it had previ-
ously; the field would NOT be transmitted
to the host with SNA IMF/iX, since no char-
acters had changed. A real 3270-type ter-
minal will transmit such modified fields
whether or not any characters are actually
changed.
• Leading blanks can be converted to nulls
based on a configuration option at Pass
Thru startup.
• Trailing blanks can be converted to nulls
based on a configuration option at Pass
Thru startup.
• Trailing nulls can be converted to blanks
based on a configuration optional Pass Thru
startup.
• Magnetic card reader, auxiliary card reader,
and light pen are not provided in HP termi-
nals using Pass Thru mode.
HP 700/96 Keyboard
User specifies by typing
desired program function
number or through user-
defined configuration of
HP function keys.
No equivalent on HP
terminals
Keys are in different
locations (Softkeys are
used)
Indicators not provided
Equivalent functions
provided
Corresponding to HP
Terminal Characters
[
]
!
^
HP 3000
Bus ness
Servers
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