Envoy ACP/XF Application Programming Manual

EnvoyACP/XF Application Programming Manual–132179
4-1
4
System Procedure Call Specifics for
EnvoyACP/XF
This section describes EnvoyACP/XF-specific information for Guardian file-system
procedures. For complete information see the Guardian Procedure Calls Reference
Manual.
Table 4-1
lists the file procedures that your application can use to interact with
EnvoyACP/XF, bit-synchronous, data-communication lines.
.
Table 4-1. File-system Procedures Used With EnvoyACP/XF
AWAITIO[X] Completes a previously initiated I/O operation on an
EnvoyACP/XF line.
CANCEL Cancel the oldest incomplete operation on a nowait file.
CANCELREQ Cancels a specific incomplete operation on a nowait file.
CHANGELIST Controls polling when the application program is acting as a
supervisor or tributary station in a centralized multipoint
configuration.
CLOSE Terminates access to the specified communications line.
(Same as FILE_CLOSE_.)
CONTROL Initiates a protocol-dependent control operation.
DEFINELIST Specifies all tributary station addresses in the entire
multipoint configuration for supervisor applications. Specifies
the station addresses to which that particular tributary will
respond for tributary applications.
FILE_CLOSE_ Terminates access to the specified communications line.
(Same as CLOSE.)
FILE_GETINFO_ Obtains information concerning the last error and
configuration information for an opened line.
FILE_GETINFOBY
NAME_
Obtains the configured device type and general information
about the specified line.
FILE_OPEN_ Obtains access to the specified communications line. (Same
as OPEN.)
OPEN Obtains access to the specified communications line. (Same
as FILE_OPEN_.)
READ[X] Accepts one incoming frame and returns data and/or a two-
byte Message Control Word (MCW) to the specified
application buffer.