diff --git a/chuniio/chuniio.h b/chuniio/chuniio.h
index 8c575c9..c13bff4 100644
--- a/chuniio/chuniio.h
+++ b/chuniio/chuniio.h
@@ -139,9 +139,10 @@ void chuni_io_slider_start(chuni_io_slider_callback_t callback);
 void chuni_io_slider_stop(void);
 
 /* Update the RGB lighting on the slider. A pointer to an array of 32 * 3 = 96
-   bytes is supplied. The illuminated areas on the touch slider are some
-   combination of rectangular regions and dividing lines between these regions
-   but the exact mapping of this lighting control buffer is still TBD.
+  bytes is supplied, organized in BRG format.
+   The first set of bytes is the right-most slider key, and from there the bytes
+   alternate between the dividers and the keys until the left-most key. 
+   There are 31 illuminated sections in total.
 
    Minimum API version: 0x0100 */
 
diff --git a/chuniio/config.c b/chuniio/config.c
index aaa048e..0f8b31b 100644
--- a/chuniio/config.c
+++ b/chuniio/config.c
@@ -63,6 +63,8 @@ void chuni_io_config_load(
     cfg->controller_led_output_pipe = GetPrivateProfileIntW(L"led", L"controllerLedOutputPipe", 1, filename);
     cfg->controller_led_output_serial = GetPrivateProfileIntW(L"led", L"controllerLedOutputSerial", 0, filename);
 
+    cfg->controller_led_output_openithm = GetPrivateProfileIntW(L"led", L"controllerLedOutputOpeNITHM", 0, filename);
+
     cfg->led_serial_baud = GetPrivateProfileIntW(L"led", L"serialBaud", 921600, filename);
 
     GetPrivateProfileStringW(
diff --git a/chuniio/config.h b/chuniio/config.h
index 3eb8223..8c5bf2c 100644
--- a/chuniio/config.h
+++ b/chuniio/config.h
@@ -18,6 +18,8 @@ struct chuni_io_config {
     bool controller_led_output_pipe;
     bool controller_led_output_serial;
 
+    bool controller_led_output_openithm;
+
     // The name of a COM port to output LED data on, in serial mode
     wchar_t led_serial_port[12];
     int32_t led_serial_baud;
diff --git a/chuniio/ledoutput.c b/chuniio/ledoutput.c
index 8cac5a3..6052e42 100644
--- a/chuniio/ledoutput.c
+++ b/chuniio/ledoutput.c
@@ -127,7 +127,11 @@ void led_output_update(uint8_t board, const byte* rgb)
         
         if (config->controller_led_output_serial)
         {
-            led_serial_update(escaped_data);
+            if (config->controller_led_output_openithm){
+                led_serial_update_openithm(rgb);
+            } else {
+                led_serial_update(escaped_data);
+            }
         }
     }
 }
diff --git a/chuniio/meson.build b/chuniio/meson.build
index 864aa87..8b03dff 100644
--- a/chuniio/meson.build
+++ b/chuniio/meson.build
@@ -4,6 +4,7 @@ chuniio_lib = static_library(
     include_directories : inc,
     implicit_include_directories : false,
     c_pch : '../precompiled.h',
+
     sources : [
         'chu2to3.c',
         'chu2to3.h',
diff --git a/chuniio/serialimpl.c b/chuniio/serialimpl.c
index 57ebb7f..7a68435 100644
--- a/chuniio/serialimpl.c
+++ b/chuniio/serialimpl.c
@@ -97,3 +97,27 @@ void led_serial_update(struct _chuni_led_data_buf_t* data)
     
     ReleaseMutex(serial_write_mutex);
 }
+
+void led_serial_update_openithm(const byte* rgb)
+{
+    if (serial_port != INVALID_HANDLE_VALUE)
+    {
+        char led_buffer[100];
+        DWORD bytes_to_write;               // No of bytes to write into the port
+        DWORD bytes_written = 0;            // No of bytes written to the port
+        bytes_to_write = sizeof(led_buffer);
+        BOOL status;
+        
+        led_buffer[0] = 0xAA;
+        led_buffer[1] = 0xAA;
+        memcpy(led_buffer+2, rgb, sizeof(uint8_t) * 96);
+        led_buffer[98] = 0xDD;
+        led_buffer[99] = 0xDD;
+        
+        status = WriteFile(serial_port,     // Handle to the Serial port
+                           led_buffer,      // Data to be written to the port
+                           bytes_to_write,  // No of bytes to write
+                           &bytes_written,  // Bytes written
+                           NULL);
+    }
+}
diff --git a/chuniio/serialimpl.h b/chuniio/serialimpl.h
index f8f276b..3f37803 100644
--- a/chuniio/serialimpl.h
+++ b/chuniio/serialimpl.h
@@ -13,3 +13,4 @@
 
 HRESULT led_serial_init(wchar_t led_com[12], DWORD baud);
 void led_serial_update(struct _chuni_led_data_buf_t* data);
+void led_serial_update_openithm(const byte* rgb);
\ No newline at end of file
diff --git a/dist/chuni/segatools.ini b/dist/chuni/segatools.ini
index 87d923d..5b8af0c 100644
--- a/dist/chuni/segatools.ini
+++ b/dist/chuni/segatools.ini
@@ -82,10 +82,12 @@ cabLedOutputSerial=0
 controllerLedOutputPipe=1
 ; Output slider LED data to the serial port
 controllerLedOutputSerial=0
+; Use the OpeNITHM protocol for serial LED output
+controllerLedOutputOpeNITHM=0
 
 ; Serial port to send data to if using serial output. Default is COM5.
 ;serialPort=COM5
-; Baud rate for serial data
+; Baud rate for serial data (set to 115200 if using OpeNITHM)
 ;serialBaud=921600
 
 ; Data output a sequence of bytes, with JVS-like framing.
diff --git a/dist/chusan/segatools.ini b/dist/chusan/segatools.ini
index c167f26..c0b19de 100644
--- a/dist/chusan/segatools.ini
+++ b/dist/chusan/segatools.ini
@@ -108,10 +108,12 @@ cabLedOutputSerial=0
 controllerLedOutputPipe=1
 ; Output slider LED data to the serial port
 controllerLedOutputSerial=0
+; Use the OpeNITHM protocol for serial LED output
+controllerLedOutputOpeNITHM=0
 
 ; Serial port to send data to if using serial output. Default is COM5.
 ;serialPort=COM5
-; Baud rate for serial data
+; Baud rate for serial data (set to 115200 if using OpeNITHM)
 ;serialBaud=921600
 
 ; Data output a sequence of bytes, with JVS-like framing.
@@ -202,7 +204,3 @@ ir=0x20
 ; ... etc ...
 ;cell31=0x53
 ;cell32=0x53
-
-; Enable slider LED serial output. This follows OpeNITHM Serial LED Protocol.
-; eg. COM5
-;ledport=