HDLC-Frame Protocol User's Guide (February 2004)

Using HDLC.FRAME Protocol
Status and Error Messages
Chapter 3 23
The following transmit completion status codes may be generated by the
HDLC.FRAME protocol.
Table 3-1 Transmit Completion Status Codes
Transmit
Status Code
Description
IO_OK No error detected.
This message was successfully transmitted to the
receiving station.
IO_DSBL Terminal disabled.
Messages cannot be transmitted by a disabled
terminal.
IO_LONG_MSG
(Z7340A only)
There is a limit to the number of buffers which
may be used for a single transmit frame. If this
limit is exceeded, the frame is flushed with this
status code, and is not transmitted. Note: The
Z7340A card has a configurable buffer size. A
buffer size of 128 bytes or larger will prevent this
problem from occurring.
IO_SHRT_MSG
(Z7340A only)
A zero length frame cannot be transmitted by the
Z7340A ACC.
IO_TX_TMOUT Cable or local modem fault.
This message cannot be sent or acknowledged
because of a bad clock or modem signal.