diff --git a/internal/device/logic.go b/internal/device/logic.go
index 5b33b2b..039c6da 100644
--- a/internal/device/logic.go
+++ b/internal/device/logic.go
@@ -164,7 +164,7 @@ func isReadableParamID(id int) bool {
 // validateParamRange checks if value is within acceptable range for parameter
 func validateParamRange(id, value int) bool {
 	ranges := map[int][2]int{
-		1:  {0, 255},     // W1 - Min Threshold
+		1:  {0, 2000},    // W1 - Min Threshold
 		2:  {0, 4095},    // W2 - Max Threshold
 		3:  {1, 50},      // W3 - Pulse Count
 		4:  {1000, 60000},// W4 - Time Window
diff --git a/internal/device/state.go b/internal/device/state.go
index 8c245dd..ad4b066 100644
--- a/internal/device/state.go
+++ b/internal/device/state.go
@@ -35,7 +35,7 @@ func NewDeviceState() *DeviceState {
 		alarmActive: false,
 		alarmType:   "",
 		params: map[int]int{
-			1:  127,   // W1 - Min Threshold (middle of 0-255)
+			1:  1200,  // W1 - Min Threshold (default as per docs)
 			2:  2047,  // W2 - Max Threshold (middle of 0-4095)
 			3:  25,    // W3 - Pulse Count (middle of 1-50)
 			4:  30500, // W4 - Time Window (middle of 1000-60000)
diff --git a/internal/tui/view.go b/internal/tui/view.go
index d20df7e..ab81a02 100644
--- a/internal/tui/view.go
+++ b/internal/tui/view.go
@@ -155,7 +155,7 @@ func (m Model) renderControlsPanel(width int) string {
 		20: "W20 (Gain)",
 	}
 	paramRanges := map[int][2]int{
-		1:  {0, 255},
+		1:  {0, 2000},
 		2:  {0, 4095},
 		3:  {1, 50},
 		4:  {1000, 60000},