Installation guide

4: Commands and Responses

DC 900-1564A 35

4.1 Access Category

The commands and responses in the Access category are used to establish access control

sessions for a speciﬁed SLC network connection. Several access modes are supported:

Master, Reader, Control, or Trace (refer back to Table 4–1 on page 33 for a summary).

For each SLC network connection, only one application session is permitted per access

mode. The

DLI_ICP_CMD_ATTACH command establishes the access mode. Also see

Section 6.2 on page 83 for suggestions on using access modes.

4.1.1 Attach

The DLI_ICP_CMD_ATTACH command obtains access to the SLC network connection

associated with a speciﬁed ICP data link. The speciﬁed ICP data link is channel 1

the SLC network connection. The corresponding

DLI_ICP_CMD_ATTACH response reports

the success or failure of the request. If successful, the SLC access session ID assigned to

the application is reported. The header formats are detailed in Section 5.1 on page 62.

4.1.2 Detach

The DLI_ICP_CMD_DETACH command relinquishes access to the SLC network connection

for the ICP link and access mode associated with a speciﬁed application session. The

corresponding

DLI_ICP_CMD_DETACH response reports the success or failure of the

request. The header formats are detailed in Section 5.5 on page 67.

1. When the multi-channel configuration option (Section 4.2.3 on page 36) is used, the application

must specify the ICP link configured as channel 1 on the SLC network connection.