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Across the Boards

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Communications Device Drivers

Section 6 - MAINCON Driver Configuration

Page 329

cfSOFTWARE Confidential,

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2000

6.27 MAINCON Panel E7, TN3270 with TN3287 Support (continued)

5. Minimum Response Time option

Forces a minimum amount of delay before sending a response to the host. Used to force a more “human”

response time. Specified in hundreths of a second, the default is zero. (0-999).

Some TN3270 servers do not correctly queue inbound data from the TN3270 terminal when a bracket state

change or bracket change direction is pending. Setting a minimum response time allows the TN3270 server

to handle the bracket change before receiving the next inbound data from the terminal.

This is primarily a problem if the host sends a bracket state change or bracket change direction in a separate

RU. CICS usually does not, TSO usually does. See also the “Accept Spurious Write” option, below.

6. Accept Spurious Writes

Some TN3270 servers insert spurious write commands into the outbound 3270 datastream while structured

fields are being sent and received. This configuration option can be used to compensate for this behavior.

When set to ‘0’, 3270 Write commands will be will be interpreted as standard for 3270 commands.

When set to ‘1’, Write commands will be processed as normal, but will not reset the structured field

pending state for the terminal. This will prevent the write command being reported as an erroneous

response when a structured field is expected from the host. This only effects data transfer in structured field

mode.

When set to ‘2’, Write commands will be processed as for option ‘1’, but a 3270 Write command with only

a WCC byte specifying only Keyboard-Restore (free keyboard) and no additional 3270 data, will cancel any

remaining “Minimum Response Time” interval.

NOTE

: When a spurious null Write/WCC(FKB) sequence is sent it often occurs when the host generates

an RU with no 3270 data in it. Often this can be an RU containing a bracket state change or bracket change

direction in a separate RU (often done by TSO). When this problem occurs, a Minimum Response Time

(recommended setting = 200) and the Accept Spurious Writes (option ‘1’ or ‘2’) options can be set to work

around this problem. If the problem is strictly the bracket state change/bracket change direction problem

generating the spurious write, setting option ‘2’ will essentially eliminate the performance penalty

introduced by setting a minimum response time.

Several version of Microsoft SNA Server have this problem, and Minimum Response Time and Accept

Spurious Writes should be set to ‘200’ and ‘2’, if communicating with TSO.

7. Suppress TN3270E Mode

When set to ‘1’, inhibits the negotiation of TN3270E mode (force “old style” TN3270 to be negotiated with

the host). Should normally be set to ‘0’.

8. Suppress DOID

When set to ‘1’, inhibits the generation of Destination-Origin-ID structured fields by the driver. This option

is for compatibility with old applications that do not support DOIDs. This includes APPX based

applications using APPX versions prior to v3.12, or pcMAINFRAME versions prior to v4.30 (both PC and

mainframe components must be at the indicated versions). This only applies if applications use structured

fields. Should normally be set to ‘0’.

9. Support Non-TN3270E SysReq/Attn

When running in non-TN3270E mode: When set to ‘1’, maps the 3270 keyboard function SysReq and Attn

to Telnet-Break and Telnet-IP. When set to zero, SysReq generates an AID X‘F0’, and Attn is not

supported.

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