diff --git a/src/ioc/db/dbAccessDefs.h b/src/ioc/db/dbAccessDefs.h
index e0e8f4484..67b529d39 100644
--- a/src/ioc/db/dbAccessDefs.h
+++ b/src/ioc/db/dbAccessDefs.h
@@ -182,6 +182,7 @@ struct dbr_alDouble     {DBRalDouble};
 #define S_db_badChoice 	(M_dbAccess|13) /*Illegal choice*/
 #define S_db_badField 	(M_dbAccess|15) /*Illegal field value*/
 #define S_db_lsetLogic 	(M_dbAccess|17) /*Logic error generating lock sets*/
+#define S_db_noLSET     (M_dbAccess|21) /*No link support table or entry*/
 #define S_db_noRSET 	(M_dbAccess|31) /*missing record support entry table*/
 #define S_db_noSupport 	(M_dbAccess|33) /*RSET or DSXT routine not defined*/
 #define S_db_BadSub 	(M_dbAccess|35) /*Subroutine not found*/
diff --git a/src/ioc/db/dbCa.c b/src/ioc/db/dbCa.c
index 5f532ad5d..1763fe3e7 100644
--- a/src/ioc/db/dbCa.c
+++ b/src/ioc/db/dbCa.c
@@ -232,11 +232,8 @@ void dbCaSync(void)
 void dbCaCallbackProcess(void *userPvt)
 {
     struct link *plink = (struct link *)userPvt;
-    dbCommon *pdbCommon = plink->precord;
 
-    dbScanLock(pdbCommon);
-    pdbCommon->rset->process(pdbCommon);
-    dbScanUnlock(pdbCommon);
+    dbLinkAsyncComplete(plink);
 }
 
 void dbCaShutdown(void)
@@ -420,6 +417,13 @@ done:
     return status;
 }
 
+static long dbCaPutAsync(struct link *plink,short dbrType,
+    const void *pbuffer,long nRequest)
+{
+    return dbCaPutLinkCallback(plink, dbrType, pbuffer, nRequest,
+        dbCaCallbackProcess, plink);
+}
+
 long dbCaPutLinkCallback(struct link *plink,short dbrType,
     const void *pbuffer,long nRequest,dbCaCallback callback,void *userPvt)
 {
@@ -717,7 +721,7 @@ static lset dbCa_lset = {
     getControlLimits, getGraphicLimits, getAlarmLimits,
     getPrecision, getUnits,
     getAlarm, getTimeStamp,
-    dbCaPutLink,
+    dbCaPutLink, dbCaPutAsync,
     scanForward
 };
 
diff --git a/src/ioc/db/dbConstLink.c b/src/ioc/db/dbConstLink.c
index 90f5d8d6b..38f5d448c 100644
--- a/src/ioc/db/dbConstLink.c
+++ b/src/ioc/db/dbConstLink.c
@@ -94,7 +94,7 @@ static lset dbConst_lset = {
     NULL, NULL, NULL,
     NULL, NULL,
     NULL, NULL,
-    NULL,
+    NULL, NULL,
     NULL
 };
 
diff --git a/src/ioc/db/dbDbLink.c b/src/ioc/db/dbDbLink.c
index e4e86316c..58f089126 100644
--- a/src/ioc/db/dbDbLink.c
+++ b/src/ioc/db/dbDbLink.c
@@ -344,7 +344,7 @@ static lset dbDb_lset = {
     dbDbGetControlLimits, dbDbGetGraphicLimits, dbDbGetAlarmLimits,
     dbDbGetPrecision, dbDbGetUnits,
     dbDbGetAlarm, dbDbGetTimeStamp,
-    dbDbPutValue,
+    dbDbPutValue, NULL,
     dbDbScanFwdLink
 };
 
diff --git a/src/ioc/db/dbLink.c b/src/ioc/db/dbLink.c
index a07d35caf..a877eec6e 100644
--- a/src/ioc/db/dbLink.c
+++ b/src/ioc/db/dbLink.c
@@ -38,6 +38,7 @@
 #include "db_field_log.h"
 #include "dbFldTypes.h"
 #include "dbLink.h"
+#include "dbLock.h"
 #include "dbScan.h"
 #include "dbStaticLib.h"
 #include "devSup.h"
@@ -149,7 +150,7 @@ long dbLoadLink(struct link *plink, short dbrType, void *pbuffer)
     if (plset && plset->loadScalar)
         return plset->loadScalar(plink, dbrType, pbuffer);
 
-    return S_db_notFound;
+    return S_db_noLSET;
 }
 
 long dbLoadLinkArray(struct link *plink, short dbrType, void *pbuffer,
@@ -160,7 +161,7 @@ long dbLoadLinkArray(struct link *plink, short dbrType, void *pbuffer,
     if (plset && plset->loadArray)
         return plset->loadArray(plink, dbrType, pbuffer, pnRequest);
 
-    return S_db_notFound;
+    return S_db_noLSET;
 }
 
 void dbRemoveLink(struct dbLocker *locker, struct link *plink)
@@ -199,7 +200,7 @@ long dbGetNelements(const struct link *plink, long *nelements)
     lset *plset = plink->lset;
 
     if (!plset || !plset->getElements)
-        return S_db_badField;
+        return S_db_noLSET;
 
     return plset->getElements(plink, nelements);
 }
@@ -235,7 +236,7 @@ long dbGetControlLimits(const struct link *plink, double *low, double *high)
     lset *plset = plink->lset;
 
     if (!plset || !plset->getControlLimits)
-        return S_db_notFound;
+        return S_db_noLSET;
 
     return plset->getControlLimits(plink, low, high);
 }
@@ -245,7 +246,7 @@ long dbGetGraphicLimits(const struct link *plink, double *low, double *high)
     lset *plset = plink->lset;
 
     if (!plset || !plset->getGraphicLimits)
-        return S_db_notFound;
+        return S_db_noLSET;
 
     return plset->getGraphicLimits(plink, low, high);
 }
@@ -256,7 +257,7 @@ long dbGetAlarmLimits(const struct link *plink, double *lolo, double *low,
     lset *plset = plink->lset;
 
     if (!plset || !plset->getAlarmLimits)
-        return S_db_notFound;
+        return S_db_noLSET;
 
     return plset->getAlarmLimits(plink, lolo, low, high, hihi);
 }
@@ -266,7 +267,7 @@ long dbGetPrecision(const struct link *plink, short *precision)
     lset *plset = plink->lset;
 
     if (!plset || !plset->getPrecision)
-        return S_db_notFound;
+        return S_db_noLSET;
 
     return plset->getPrecision(plink, precision);
 }
@@ -276,7 +277,7 @@ long dbGetUnits(const struct link *plink, char *units, int unitsSize)
     lset *plset = plink->lset;
 
     if (!plset || !plset->getUnits)
-        return S_db_notFound;
+        return S_db_noLSET;
 
     return plset->getUnits(plink, units, unitsSize);
 }
@@ -287,7 +288,7 @@ long dbGetAlarm(const struct link *plink, epicsEnum16 *status,
     lset *plset = plink->lset;
 
     if (!plset || !plset->getAlarm)
-        return S_db_notFound;
+        return S_db_noLSET;
 
     return plset->getAlarm(plink, status, severity);
 }
@@ -297,7 +298,7 @@ long dbGetTimeStamp(const struct link *plink, epicsTimeStamp *pstamp)
     lset *plset = plink->lset;
 
     if (!plset || !plset->getTimeStamp)
-        return S_db_notFound;
+        return S_db_noLSET;
 
     return plset->getTimeStamp(plink, pstamp);
 }
@@ -309,7 +310,7 @@ long dbPutLink(struct link *plink, short dbrType, const void *pbuffer,
     long status;
 
     if (!plset || !plset->putValue)
-        return S_db_notFound;
+        return S_db_noLSET;
 
     status = plset->putValue(plink, dbrType, pbuffer, nRequest);
     if (status) {
@@ -320,6 +321,33 @@ long dbPutLink(struct link *plink, short dbrType, const void *pbuffer,
     return status;
 }
 
+void dbLinkAsyncComplete(struct link *plink)
+{
+    dbCommon *pdbCommon = plink->precord;
+
+    dbScanLock(pdbCommon);
+    pdbCommon->rset->process(pdbCommon);
+    dbScanUnlock(pdbCommon);
+}
+
+long dbPutLinkAsync(struct link *plink, short dbrType, const void *pbuffer,
+        long nRequest)
+{
+    lset *plset = plink->lset;
+    long status;
+
+    if (!plset || !plset->putAsync)
+        return S_db_noLSET;
+
+    status = plset->putAsync(plink, dbrType, pbuffer, nRequest);
+    if (status) {
+        struct dbCommon *precord = plink->precord;
+
+        recGblSetSevr(precord, LINK_ALARM, INVALID_ALARM);
+    }
+    return status;
+}
+
 void dbScanFwdLink(struct link *plink)
 {
     lset *plset = plink->lset;
@@ -341,7 +369,7 @@ long dbLoadLinkLS(struct link *plink, char *pbuffer, epicsUInt32 size,
         return 0;
     }
 
-    return S_db_notFound;
+    return S_db_noLSET;
 }
 
 long dbGetLinkLS(struct link *plink, char *pbuffer, epicsUInt32 size,
diff --git a/src/ioc/db/dbLink.h b/src/ioc/db/dbLink.h
index 628483119..834400c73 100644
--- a/src/ioc/db/dbLink.h
+++ b/src/ioc/db/dbLink.h
@@ -48,6 +48,8 @@ typedef struct lset {
     long (*getTimeStamp)(const struct link *plink, epicsTimeStamp *pstamp);
     long (*putValue)(struct link *plink, short dbrType,
             const void *pbuffer, long nRequest);
+    long (*putAsync)(struct link *plink, short dbrType,
+            const void *pbuffer, long nRequest);
     void (*scanForward)(struct link *plink);
 } lset;
 
@@ -83,6 +85,9 @@ epicsShareFunc long dbGetTimeStamp(const struct link *plink,
         epicsTimeStamp *pstamp);
 epicsShareFunc long dbPutLink(struct link *plink, short dbrType,
         const void *pbuffer, long nRequest);
+epicsShareFunc void dbLinkAsyncComplete(struct link *plink);
+epicsShareFunc long dbPutLinkAsync(struct link *plink, short dbrType,
+        const void *pbuffer, long nRequest);
 epicsShareFunc void dbScanFwdLink(struct link *plink);
 
 epicsShareFunc long dbLoadLinkLS(struct link *plink, char *pbuffer,