diff --git a/config/devices.properties b/config/devices.properties
index c29207d..309b327 100644
--- a/config/devices.properties
+++ b/config/devices.properties
@@ -1,4 +1,4 @@
 robot=RobotTcp|127.0.0.1:1000|||
-robot_modbus=RobotModbus|127.0.0.1:850|||
+robot_modbus=RobotModbus|127.0.0.1:851|||
 $dewar=ch.psi.pshell.modbus.ModbusTCP|PC12288:502|||
 $temperature=ch.psi.pshell.modbus.AnalogInput|dewar 0|||