Synchronous request

After a synchronous request, or a CHECK or ENDREQ macro, the return code in register 15 indicates if the request completed successfully. Table 1 describes each return code returned in register 15.

Table 1. Return Code in Register 15 Following Synchronous Request
Return Code (RPLRTNCD)	Meaning
0(X'0')	Request completed successfully.
4(X'4')	Request was not accepted because the request parameter list indicated by the request (RPL=address) was active for another request.
8(X'8')	Logical error; specific error is indicated in the RPL feedback area.
12(X'C')	Physical error; specific error is indicated in the RPL feedback area.