diff --git a/.gitignore b/.gitignore
index 94bbcd7..f9ffa8b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -28,7 +28,7 @@ backend/.tmp_ws_check.py
 backend/data/
 
 # Environment files
-.env
+
 .env.*
 !.env.example
 !backend/.env.example
diff --git a/backend/.env b/backend/.env
new file mode 100644
index 0000000..6f01075
--- /dev/null
+++ b/backend/.env
@@ -0,0 +1,27 @@
+EMCP_DATA_DIR=/userdata/emcp/data
+EMCP_ALARM_DB_PATH=/userdata/emcp/data/alarm.db
+EMCP_BACKUP_DIR=/userdata/emcp/data/backups
+
+# true: use MockDeviceClient
+# false: use real Modbus client
+EMCP_USE_MOCK_DEVICE=true
+
+# mock | rtu | tcp
+EMCP_MODBUS_TRANSPORT=mock
+EMCP_MODBUS_SLAVE_ID=1
+EMCP_MODBUS_TIMEOUT_SECONDS=1.0
+
+# float decode options
+EMCP_MODBUS_FLOAT_BYTE_ORDER=big
+EMCP_MODBUS_FLOAT_WORD_ORDER=big
+
+# RTU settings
+EMCP_MODBUS_SERIAL_DEVICE=/dev/ttyS1
+EMCP_MODBUS_SERIAL_BAUD=115200
+EMCP_MODBUS_SERIAL_PARITY=N
+EMCP_MODBUS_SERIAL_DATA_BITS=8
+EMCP_MODBUS_SERIAL_STOP_BITS=1
+
+# TCP settings
+EMCP_MODBUS_TCP_HOST=127.0.0.1
+EMCP_MODBUS_TCP_PORT=502