diff --git a/das/src/main/java/com/das/modules/node/command/HeartbeatCommand.java b/das/src/main/java/com/das/modules/node/command/HeartbeatCommand.java
index 45db3a1b..b2ecf27b 100644
--- a/das/src/main/java/com/das/modules/node/command/HeartbeatCommand.java
+++ b/das/src/main/java/com/das/modules/node/command/HeartbeatCommand.java
@@ -46,11 +46,11 @@ public class HeartbeatCommand implements BaseCommand{
                 for (JsonNode linkNode : links) {
                     String linkId = linkNode.get("linkId").asText();
                     boolean online = linkNode.get("online").asBoolean();
-                    JsonNode modbusNode = linkNode.get("modbus");
-                    if (modbusNode != null){
-                        boolean modbus = modbusNode.asBoolean();
+                    JsonNode realNode = linkNode.get("real");
+                    if (realNode != null){
+                        boolean real = realNode.asBoolean();
                         String key = String.format("link:%s:modbus", linkId);
-                        ops.set(key, modbus, HEARTBEAT_TTL, TimeUnit.SECONDS);
+                        ops.set(key, real, HEARTBEAT_TTL, TimeUnit.SECONDS);
                     }
                     JsonNode ftpNode = linkNode.get("ftp");
                     if (ftpNode != null){