diff --git a/unilabos/devices/pump_and_valve/runze_multiple_backbone.py b/unilabos/devices/pump_and_valve/runze_multiple_backbone.py
index ab6b286f..51d1ea28 100644
--- a/unilabos/devices/pump_and_valve/runze_multiple_backbone.py
+++ b/unilabos/devices/pump_and_valve/runze_multiple_backbone.py
@@ -145,6 +145,16 @@ class RunzeMultiplePump:
         total_steps_vel = 48000 if mode == RunzeSyringePumpMode.AccuratePosVel else 6000
         return total_steps, total_steps_vel
 
+    def _receive(self, data: bytes) -> str:
+        """
+        Keep this method as original. Always use chr to decode, avoid "/0"
+        """
+        if not data:
+            return ""
+        # **Do not use decode method
+        ascii_string = "".join(chr(byte) for byte in data)
+        return ascii_string
+
     def send_command(self, full_command: str) -> str:
         """Send command to hardware and get response"""
         full_command_data = bytearray(full_command, "ascii")
@@ -175,11 +185,6 @@ class RunzeMultiplePump:
             output = self.send_command(full_command)[3:-3]
         return output
 
-    def _receive(self, data: bytes) -> str:
-        if not data:
-            return ""
-        ascii_string = "".join(chr(byte) for byte in data)  # *Do not use decode('ascii', errors='ignore')
-        return ascii_string
 
     def _run(self, address: str, command: str) -> str:
         """