<![CDATA[Server room is a room used to store server computers, network equipment such as routers, server computers and other important equipment. This server room requires special attention to protect the equipment in it, such as temperature, humidity, fire and other disasters. Therefore, in this study it is proposed to implement a server room monitoring system with the modbus interconnection protocol to measure temperature, humidity, vibration and electric current conditions in the server room. The system uses 1 master to display data and provide warnings and 2 slaves paired with sensors. The system is connected via the RS485 module and data transmission uses Modbus RTU. In addition, the system uses a master-slave which uses Wemos D1 mini on the master and Arduino Nano on the slave connected to the DHT11, SW420 and SCT-013-00 sensors. The results of this study are that the system as a whole can monitor the server room via LCD16x2 and Telegram and the system can provide warnings when room conditions are abnormal in the form of alarms with minor, major and critical levels as well as warning notifications to Telegram when in predetermined conditions. The system can send sensor data from slave to master with a cable length of 5 meters for slave 2 and 4 meters for slave 1. At a timeout value of 3574ms the system has an average time interval for sending data from slave 1 which is 196.4ms and from slave 2 which is 598.5ms with data read by the master having a length of 13-14 data.]]>
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