Communications Error Tables; So Lc Error Codes; Modem Control Error Codes - IBM 5280 Technical Newsletter

993
COMMUNICATIONS ERROR TABLES
(continued)
SO LC Error Codes
The following error codes are logged during SO LC
communications only:
Hexadecimal
Error Code
50
51
52
53
54
55
56
57
58
59
5A-75
76-80
80-9F
Meaning
Overrun; the data is being received too fast for the IBM 5280 MPU.
Underrun; the IBM 5280 cannot transmit fast enough for the line.
Not used.
Frame check sequence error.
The IBM 5280 received a frame with a transmit sequence error.
The IBM 5280 received a framethat contained less than four bytes between flags.
The remote station canceled the frame.
Not used.
The trailing flag was not on an 8-bit boundary.
Transmit timeout. The IBM 5280 cannot transmit a frame within the time specified in hexadecimal
displacement 42 of the CCB.
Not used.
Communications MPU errors.
Communications MPU errors; for example, invalid buffer addressing. (Error codes 96 through 99 are
probably MPU errors, error codes 9A through 90 may be ca.used by either the MPU or the CAM, and
error codes 9E and 9F are probably MPU errors.
Modem Contr.ol Error Codes
The following error codes are logged for all communications:
Hexadeci mal
Error Code
AO
A1
A2
A3
A4
A5
A6-AF
Meaning
When performing an MPU open operation, the data-set-ready line was already on or the data-set-ready
line did not go off on a switched line when the line was disconnected.
The data-set-ready line went off unexpectedly.
Receive timeout; the IBM 5280 received nothing within the time specified in the activity timeout timer
(hexadecimal displacement 43 in the CCB).
The IBM 5280 detected the clear-to-send line on when attempting to turn on the request-to-send line.
The data-set-ready line did not turn on.
The clear-to-send line did not turn on.
Not used.
993
Communications Error Tables 235