HP 11i User Manual download pdf (Page 37)

Chapter 3 37

Using HDLC/LAP-D Protocol

Status and Error Messages

Read Completion Status Codes

All receive completion messages will have the status IO_OK.Received

messages that have errors are not returned by the protocol.

1 IO_DSBL Terminal disabled

The terminal must be enabled before it will accept

write or control write requests.

11 IO_LONG_MSG Message too long

Indicates one of the following errors:

• The packet length in the header is not zero.

• The control length in the header is not zero for a

CW_STATS or CW_REVCODE request.

• The control length in the header is greater than six

for a CW_TIMERS request.

12 IO_SHRT_MSG Message too short

Indicates one of the following errors:

• The request length is less than four (too short to

contain the control write header).

• The control length in the header is less than six for

a CW_TIMERS request.

24 IO_BAD_CTL Bad control function or format

Indicates one of the following errors:

• The control length in the header does not equal the

request length plus four.

• The control code in the header contains a value

other than CW_STATS

, CW_REVCODE or

CW_TIMERS.

• The value specified for a timer resolution in a

CW_TIMERS request is outside of the range zero to

four.

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HP 11i User Manual Page 37