Experimental Physics and
Industrial Control System

"Return codes are communicated in the protocol by the CA_PROTO_READ_NOTIFY, CA_PROTO_WRITE_NOTIFY, monitor subscription responses, and the CA_PROTO_ERROR responses."

All,

 

According to the Channel Access protocol specification from the Cosylab website, parameter 1 of the header of a CA_PROTO_READ_NOTIFY response contains the channel SID (the same as the request header received).

 

Is this correct?  Monitoring network traffic from a 3.14.12 win32-x86 soft IOC, this value always appears to a fixed value of 1, no matter what the serverID, or clientID of the channel.  Returning anything other than 1 also appears to break correct functioning of a caget.

 

Thanks,

 

Graham

 

Header

Field	Value	Description
Command	15	Command identifier for CA_PROTO_READ_NOTIFY.
Payload size	Size of payload	Size of DBR formatted data in payload.
Data type	DBR type	Payload format.
Data count	>= 0	Payload element count.
SID	Same as request	SID of the channel.
IOID	Same as request	IOID of this operation.

 

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