HP Advanced Communications Controllers (ACC) manual Status and Error Messages

Using HDLC/LAP-D Protocol

Status and Error Messages

Status and Error Messages

HDLC/LAP-D produces a range of buffer status codes and unsolicited status messages, apart from the standard communications statuses described elsewhere in the ACC documentation. In the following descriptions, the statuses marked with a dagger (†) are not generated by UI terminals. The defines for these status codes are located in /usr/include/zcom/zcomstatus.h and /usr/include/zcom/zx25status.h.

Terminal Request Status Codes

The following statuses are returned in response to a request to create, destroy, enable, disable, activate or deactivate a terminal. Although these are a part of the standard status set, they are not used by all protocols, and have a particular significance within HDLC/LAP-D.

0	TM_OK	No error detected
		The request was successfully processed. In the case of
		enabling or disabling the terminal, this does not mean
		that the link has been established or disconnected. The
		link status is reported via unsolicited status messages.
1	TM_MUST_DSBL	Terminal must be disabled
		This status code is returned in response to a terminal
		delete request. Before deleting a terminal, it must be
		disabled and the ST25DSBL unsolicited status message
		must have been received.
12	TM_PROT_REJ	Protocol detected error
		TM_PROT_REJ is returned in response to a terminal
		enable request when the configuration specified by the
		poll, select and option words is invalid. In addition to

returning TM_PROT_REJ, the protocol generates a ST25ENF unsolicited status message. For configuration information, Chapter 4 , “Protocol Specific Configuration.” Another possible, although unlikely, cause for TM_PROT_REJ is that an error occurred when the protocol attempted to setup a group of LAP-D terminals. In this case, the ST25ENF unsolicited status message will not be generated.

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