9
Using the Pass Thru mode does not require
Table 2.
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 |
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
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
[
]
!
^
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
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
•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 3000