diff --git a/df_datalink_sp/src/systembus/systembus.c b/df_datalink_sp/src/systembus/systembus.c
index 1a27673..315fb67 100644
--- a/df_datalink_sp/src/systembus/systembus.c
+++ b/df_datalink_sp/src/systembus/systembus.c
@@ -282,7 +282,7 @@ static int32_t SystemBus_SystemConfig(SYSBUS *instPtr, uint8_t *msg)
 	if (msg[WD_MODE_CMD] == MODE_CMD_HEAD)
 	{
 		// head node config
-		reconfig = (L2_NODE_HEAD != linkConfig.myType);
+		reconfig = (L2_NODE_HEAD != L2_GetNodeType(linkInstPtr));
 		linkConfig.myType = L2_NODE_HEAD;
 		linkConfig.myId = 1;
 	}
@@ -290,7 +290,7 @@ static int32_t SystemBus_SystemConfig(SYSBUS *instPtr, uint8_t *msg)
 	else if (msg[WD_MODE_CMD] == MODE_CMD_MEMBER)
 	{
 		// member node config
-		reconfig = (L2_NODE_MEMBER != linkConfig.myType);
+		reconfig = (L2_NODE_MEMBER != L2_GetNodeType(linkInstPtr));
 		linkConfig.myType = L2_NODE_MEMBER;
 		linkConfig.myId = 2;
 	}