User`s guide

90 DC 900-1317J
ADCCP NRM Programmer’s Guide
level protocol transactions. The client transmits and receives frames as Unformatted
Data packets and is responsible for conforming to the initialization mode requirements
specified for its application and configuration. The ICP handles FCS generation and
checking only and does not interpret the contents of any frame exchanged on the link.
Theoretically, a primary station may download a data base or program to a secondary
station while both are in the initialization state. The facility for passing unformatted
data allows information transfer without requiring that the format conform to ADCCP
I-frame or UI-frame format. However, exchange of unformatted data in an unbalanced
multi-drop configuration may cause errors for other stations not in initialization mode.
A transition from the initialization state to the information transfer state occurs as a
result of the exchange of a mode-setting command (SNRM or SNRME) and acknowl-
edgment (UA) on the link. This change of state applies only to the specified station. The
ICP does not initiate this change of state while in the initialization state; the client ini-
tiates it by sending a
DLI_PROT_SEND_BIND packet specifying the usProtXParms[0] field (sta-
tion ID). Once the logical link is established, the ICP responds with the
DLI_PROT_RESP_BIND_ACK packet containing the same usProtXParms[0] field (station ID).
A transition from the initialization state to the logically disconnected state occurs as a
result of the exchange of a DISC command and acknowledgment (UA or DM) on the
link. This state change applies only to the specified station. The ICP does not initiate
this change of state while in the initialization state. The client initiates this change of
state by sending a
DLI_PROT_SEND_UNBIND packet specifying the usProtXParms[0] field (sta-
tion ID); once the logical link is disconnected, the ICP responds with the
DLI_PROT_RESP_UNBIND_ACK packet containing the same usProtXParms[0] field (station
ID).