Across the Boards
Communications Device Drivers
Section 6 - MAINCON Driver Configuration
Page 288
cfSOFTWARE Confidential,
2000
6.21 MAINCON Panel E1, Single Session TN3270 (continued)
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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