Texas Instruments 990 User Manual page 95

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Table E-2. Communication Completion/Error Codes
Description
No error
Line disconnected
I/ 0 terminated abnormally
NAK threshold exceeded
ENQ threshold exceeded
Recovery Procedure
None required.
Connection must be reestablished if additional
data transfers are desired.
The receiving terminal received an EOT prior
to receiving an ETX. The data file must be
retransmitted to obtain a complete data trans-
fer. Refer to Appendix F for a description of
the EOT and ETX characters.
The communication link is unusually bad. Try
to reconnect the link to see if another cir-
cuit will allow transfers. Refer to Appendix
F for a description of a NAK character.
The remote system is either responding incor-
rectly (wrong acknowledgement) or is not res-
ponding at all. Determine if the remote
system has disconnected. Refer to Appendix F
for a description of an ENQ character.
E-5/E-6 Digital Systems Group