HP 11i User Manual download pdf (Page 34)

34 Chapter3

Using HDLC/LAP-D Protocol

Status and Error Messages

The following status messages are sent after an error occurs when the

link is in multiple frame acknowledged operation. The error conditions

include cable faults, inability to receive acknowledgment of transmitted

frames or receiving frames that are inconsistent with multiple frame

acknowledged operation. When one of these error conditions occur, the

protocol attempts to reestablish multiple frame acknowledged operation.

After the attempt has either succeeded or failed, the unsolicited status

message th at reflects the original error condition is sent. If the attempt

fails, the link is considered disconnected and the down bit will be set in

the status; otherwise the l ink has only been reset and the down bit will

be clear

64 ST25ENBL† Link NOT established on ENABLE

This status message is generated in response to a

terminal enable request after it is determined that

multiple frame acknowledged operation can not be

established. The down bit will always be set.

65 ST25DSBL Link disconnected on DISABLE

This status message is generated in response to a

terminal disable request after multiple frame

acknowledged operation has terminated. The down bit

will always be set.

77 ST25ENF ENABLE failed - bad config

This status message is generated in response to a

terminal enable request when the terminal’s

configuration is invalid. The down bit will always be

set.

66 ST25XDCD Link disc. on loss of carrier

The card is no longer receiving the required

communications signals. This can be caused by incorrect

port configuration or disconnected/faulty cabling.

68 ST25RTRY† Exceeded retransmit limit

A frame was transmitted N200 times without receiving

an acknowledgment from the remote.

1 2 ... 29 30 31 32 33 34 35 36 37 38 39 ... 53 54

No comments

HP 11i User Manual Page 34