User`s guide

3: BSC 3270 DLI Functions
DC 900-1340I 77
When a tributary link is started, each device on that link has a status associated with it
based on the settings of the device status bits. Every device on the link is in one of four
general status conditions, which determines how that device responds to select
sequences from the BSC 3270 master. Ta bl e 3 –9 lists the status conditions and
responses.
See Section A.4 on page 197 for more information on virtual device procedures and line
sequence diagrams.
An unsuccessful 3270 virtual device status report request can return the following error
code in the
dlRead pOptArgs.iICPStatus field (see Appendix D for error handling):
DLI_ICP_ERR_BAD_PARMS
The parameter value(s) used for the function call are
illegal.
Table 3–9: BSC 3270 Device Status Conditions and Responses
Status Condition Status Bit Response to Select
Nonexistent is = 0 None
Available is = 1 ACK 0
Unavailable ir = 1 RVI
Busy db = 1 WACK