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6.16 Error Response Numbers
The Error number is always the fourth parameter in all responses. This number is normally the
parameter number of the command that the eCNA could not process because it was out of range or
missing. However, there are a few special case Error numbers that have been defined.
Error Number Description
0 OK - All data in the packet received by the eCNA was accepted.
1
Not used. The command must start with the valid parameter, CMD, . If it doesn’t the characters up to and
including the next CR LF are discarded and the eCNA does not respond.
2 The command was not recognized. This response always return Sequence Number = 0.
3 to n
This Error Number indicates which parameter of the received packet has a problem. The parameter was
unrecognized or out of range. None of the data in the received packet was stored. Example:
“CMD,XST,0,Host,xxx,SPN,OK,NO,?” would return an Error Number of 5 indicating that xxx was not
recognized as a valid parameter.
989
General purpose timer reserved. Any attempts to start or clear a timer currently owned by another CAI channel
or eCNA will get this error number in the response.
990 NXQ Cue command parameter did not match the cue number in the program.
991 Exception Timer is already running. Too late to start the Exception Timer.
992 Can not change Program number because a show is in progress.
993 Won’t set Clock. Indicates that the eCNA won’t set the Real Time Clock because it is configured for NTP time.
994
Command Blocked by Instruction. Indicates that the command was blocked by the program CAI Command
Block instruction.
995 Can not start because there is a fault.
996
Indicates I/O Board is not present or not responding. This error can be returned for the DIN. DOT and RDO
commands.
997 Client Control is disabled at the eCNA. eCNA Main CPU Board DIP switch S2-8 is off.
998 Resource Not Available. This is returned when the connection is not available (already connected).
999
Checksum Error. The packet received by the eCNA had a missing or incorrect checksum and was ignored. If
possible, the eCNA returns the normal response packet (but did not use the received data).
6.17 Connect Error Response
In the special case where the eCNA communications resource is already being used, when the client
tries to connect, the following error response is sent back to the caller and the connection is then
closed by the eCNA.
Command Response
Any RSP,ERR,0,998,Resource Unavailable,828<CR><LF>
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eCNA-10 Operation and Installation Manual Version 1.270-00
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