ACC HDLC-NRM (SDLC) User's Guide

Using HDLC-NRM (SDLC) Protocols
Status and Error Messages
Chapter 338
IO_BUSY
(3)
Terminal busy for too long.
Messages cannot be sent to the remote station
because it is busy.
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.
Table 3-1 Buffer Completion Status (Continued)
Status Code
Value
Description