diff --git a/sdk/webservice/ManagerV2.cpp b/sdk/webservice/ManagerV2.cpp
index e473eb88..32454f6c 100644
--- a/sdk/webservice/ManagerV2.cpp
+++ b/sdk/webservice/ManagerV2.cpp
@@ -3625,29 +3625,32 @@ namespace ver_2
 
 				if (0 == strcmp(devParams[i].name.c_str(), name) || 0 == strcmp(devParams[i].title.c_str(), title))
 				{
-					if (SANE_TYPE_STRING == desp->type)
-					{
-						if (SANE_STATUS_GOOD != sane_control_option(hdev, j, SANE_ACTION_SET_VALUE, (void*)devParams[i].stringValue.c_str(), NULL))
-							ret = -1;
-					}
-					else if (SANE_TYPE_INT == desp->type)
-					{
-						SANE_Int value = devParams[i].intValue;
-						if (SANE_STATUS_GOOD != sane_control_option(hdev, j, SANE_ACTION_SET_VALUE, &value, NULL))
-							ret = -1;
-					}
-					else if (SANE_TYPE_FIXED == desp->type)
-					{
-						SANE_Fixed value = SANE_FIX(devParams[i].doubleValue);
-						if (SANE_STATUS_GOOD != sane_control_option(hdev, j, SANE_ACTION_SET_VALUE, &value, NULL))
-							ret = -1;
-					}
-					else if (SANE_TYPE_BOOL == desp->type)
-					{
-						SANE_Bool value = (SANE_Bool)devParams[i].boolValue;
-						if (SANE_STATUS_GOOD != sane_control_option(hdev, j, SANE_ACTION_SET_VALUE, &value, NULL))
-							ret = -1;
-					}
+                    if (!IS_CAP_READONLY(desp->cap))
+                    {
+                        if (SANE_TYPE_STRING == desp->type)
+                        {
+                            if (SANE_STATUS_GOOD != sane_control_option(hdev, j, SANE_ACTION_SET_VALUE, (void*)devParams[i].stringValue.c_str(), NULL))
+                                ret = -1;
+                        }
+                        else if (SANE_TYPE_INT == desp->type)
+                        {
+                            SANE_Int value = devParams[i].intValue;
+                            if (SANE_STATUS_GOOD != sane_control_option(hdev, j, SANE_ACTION_SET_VALUE, &value, NULL))
+                                ret = -1;
+                        }
+                        else if (SANE_TYPE_FIXED == desp->type)
+                        {
+                            SANE_Fixed value = SANE_FIX(devParams[i].doubleValue);
+                            if (SANE_STATUS_GOOD != sane_control_option(hdev, j, SANE_ACTION_SET_VALUE, &value, NULL))
+                                ret = -1;
+                        }
+                        else if (SANE_TYPE_BOOL == desp->type)
+                        {
+                            SANE_Bool value = (SANE_Bool)devParams[i].boolValue;
+                            if (SANE_STATUS_GOOD != sane_control_option(hdev, j, SANE_ACTION_SET_VALUE, &value, NULL))
+                                ret = -1;
+                        }
+                    }
 
 					find = true;
 					break;