Experimental Physics and
Industrial Control System

Ø  According to the Channel Access protocol specification from the Cosylab website,

Ø  parameter 1 of the header of a CA_PROTO_READ_NOTIFY response contains the

Ø  channel SID (the same as the request header received).

 

typedef struct ca_hdr {

    ca_uint16_t m_cmmd;         /* operation to be performed */

    ca_uint16_t m_postsize;     /* size of payload */

    ca_uint16_t m_dataType;     /* operation data type */

    ca_uint16_t m_count;        /* operation data count */

    ca_uint32_t m_cid;          /* channel identifier */

    ca_uint32_t m_available;    /* protocol stub dependent */

} caHdr;

 

The m_cid field in the CA_PROTO_READ_NOTIFY response message header

communicates the CA status (see caerr.h) of the request, as it was executed in the

server, with this request type.

 

Jeff