User`s guide

3: BSC 3270 DLI Functions
DC 900-1340I 63
BSC 3270 software responds with the new poll list using the same
pOptArgs.usProtCommand field and format used to set the poll list.
It is possible to configure an “empty” poll list by issuing a poll list command with a –1
(hex FF) as the only CU number in the list. In this case, a control station does not issue
general polls but may issue specific polls and select sequences as directed by the client.
For tributary links in test mode (Station ID = 32), the Set Poll List command is used to
signify the control units which the BSC software will emulate on the link.
If a Set Poll List command is issued with a data size equal to zero, the BSC 3270 software
responds to the client with a list of the current CU numbers in the poll list.
An unsuccessful Set Poll List command can return one of the following error codes in
the
dlRead pOptArgs.iICPStatus field (see Appendix D for error handling):
DLI_ICP_ERR_BAD_MODE
The function request is not available for the requested
access mode.
Figure 3–3: Set Poll List Command Example
0
1
3
6
Byte
0
1
2
3
pBuf
iBufLen = 4