diff --git a/index.js b/index.js
index d97d5e5..9428385 100644
--- a/index.js
+++ b/index.js
@@ -97,10 +97,26 @@ module.exports = function (app) {
 
     try {
       await bms.open();
-      await bms.getStatus(); // necessario per cell/temp
+
+      let lastErr = null;
+      for (let i=0; i<3; i++) {
+        try {
+          await bms.getStatus();
+          lastErr = null;
+          break;
+        } catch (error) {
+          lastErr = error;
+          await new Promise(r => setTimeout(r, 500));
+        }
+        if (lastErr) throw lastErr;
+      }
       app.setPluginStatus(`Connesso a ${opts.device}`);
     } catch (e) {
       app.setPluginError(`init failed: ${e.message}`);
+      if (bms) {
+        await bms.close().catch(()=>{});
+        bms = null;
+      }
       return;
     }
 
diff --git a/src/bmscore.js b/src/bmscore.js
index 61bdcee..9a5faa0 100644
--- a/src/bmscore.js
+++ b/src/bmscore.js
@@ -29,9 +29,13 @@ class BMS {
         dataBits: 8,
         parity: 'none',
         stopBits: 1,
+        lock: true,
         autoOpen: false
       });
-      this.port.open(err => err ? reject(err) : this.port.flush(() => resolve()));
+      this.port.open(err => {
+        if (err) return reject(err);
+        setTimeout(() => this.port.flush(() => resolve()), 300);
+      });
     });
   }