CAS ERROR CODES
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CAS compatible fax boards return NEGATIVE error codes. This list contains
all of the "current" codes (more may be added later).

CODE   DESCRIPTION
----- ------------------------------------------------------------------------
CLASS: FAX ERRORS

-1123  Can't get through to remote unit
       (this is the most common error.  Remote fax didn't answer)
-1025  Remote fax not Group III compatible (no fax handshake)
-1026  Remote fax handshake failure
-1027  Remote fax requested disconnect
-1028  Remote unit isn't capable of file transfers
-1029  Exceeded retrain for fax resend limit
-1030  Remote and local don't agree on bit rate (line noise)
-1031  Remote unit disconnect after receiving data
-1032  No response from remote after sending data
       (they turned off their fax machine halfway through)
-1033  Remote fax capabilities incompatible
       (example, remote fax does not support fine mode)
-1035  Invalid response from remote after sending data
-1037  Phone line dead or remote unit disconnected
-1041  Invalid command from remote after receiving data
-1045  Tried to receive from incompatible hardware
-1055  Unexpected end of file while receiving.
-1116  Received data overflowed input buffer.
-1118  Remote did not send any data
-1119  Remote took too long to send fax scan line
-1124  User cancelled event

CLASS: WARNINGS

0      Fax completed successfully
-2     Bad scan line count
-3     Page sent with errors, couldn't resent
-5     Invalid or missing logo file
-6     File name doesn't match NSF header
-7     File size doesn't match NSF header

CLASS: DOS WARNINGS; DATA WAS SENT

-257   Invalid function number
-261   Access denied
-262   Invalid handle

FATAL ERRORS: Fax transmission failed

-512   Multiplex handler failed
-513   Unknown command (bad function number)
-514   Event not found (bad event handle)
-515   Attempted to Find Next before Find First
-516   No more events
-519   Invalid Queue type (bad Queue number)
-520   Bad Control File
-521   Communication board is busy
-522   Invalid command parameter
-523   Can't uninstall the Resident Manager
-524   File already exists
-640   Unknown task type
-641   Bad phone number
-642   Bad PCX file header (invalid PCX file)
-643   Unexpected End-of-file (invalid PCX file)
-644   Unexpected disconnect
-645   Exceeded maximum dialing retries
-646   No files specified for event
-647   Fax card timeout
-648   Received more than 1023 pages of data
-649   Manual connect posted too long ago
-650   Hardware command set error
-651   Bad NSF header file

CLASS: FATAL DOS ERRORS

-770   File not found
-771   Path not found