ACC HDLC-NRM (SDLC) User's Guide

38 Chapter3
Using HDLC-NRM (SDLC) Protocols
Status and Error Messages
IO_TX_RETRY
(4)
Too many retransmissions.
There were too many retransmissions needed to send
this message or to obtain an acknowledgment for this
message.
IO_TERM_TMOUT
(6)
No terminal response.
There is no response from this terminal for this
message or a request for acknowledgment.
IO_PROT_REJ
(10)
Protocol rejects request.
This status code is used for messages which are
attempted to be transmitted to a secondary broadcast
terminal.
IO_DOWN
(20)
Terminal down.
Messages cannot be successfully transmitted because
the terminal is down.
IO_LNK_RST
(23)
Link reset.
Messages which were outstanding and
unacknowledged at the time when the link is reset with
a SNRM/UA sequence are completed with this status
code. These messages have been transmitted, but not
properly acknowledged.
In Loop mode the link may also be reset due to the
secondary station sending an RIM frame.
ST25RXFR
(70)
Received frame reject.
Messages which were outstanding and
unacknowledged at the time when the link is reset due
to a received frame reject are completed with this
status code. These messages have been transmitted, but
not acknowledged.
Table 3-1 Buffer Completion Status
Status Code Value Description