HP 3000 Series Manuale - Pagina 9

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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

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