diff --git a/firmware/modbus-sd-VSD-generic/data/pm8k_2024923.csv b/firmware/modbus-sd-VSD-generic/data/pm8k_2024923.csv
new file mode 100644
index 0000000..61a41fd
--- /dev/null
+++ b/firmware/modbus-sd-VSD-generic/data/pm8k_2024923.csv
@@ -0,0 +1,39 @@
+
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+2024-9-23 21:50:16,2024,10,15,20,25,275879.18,0.00,275879.18,275879.18,353.28,454.06,807.33,-100.78,275891.18,0.00,0.48,0.00,0.00,247401.81,0.00,0.00,353.28,0.00,0.00,454.06,30106.41,0.00,0.00,245756.50,0.00,0.00,4485.08,0.00,0.00,4437.08,0.00,nan,nan,nan,nan,nan,nan,nan,0.00,0.00,28477.23,0.00,0.00,246294.14,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,nan,
+2024-9-23 21:50:24,2024,10,15,20,25,275879.18,0.00,275879.18,275879.18,353.28,454.06,807.33,-100.78,275891.18,0.00,0.48,0.00,0.00,247401.81,0.00,0.00,353.28,0.00,0.00,454.06,30106.41,0.00,0.00,245756.50,0.00,0.00,4485.08,0.00,0.00,4437.08,0.00,nan,nan,nan,nan,nan,nan,nan,0.00,0.00,28477.23,0.00,0.00,246294.14,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,nan,
+2024-9-23 21:50:31,2024,10,15,20,25,275879.18,0.00,275879.18,275879.18,353.28,454.06,807.33,-100.78,275891.18,0.00,0.48,0.00,0.00,247401.81,0.00,0.00,353.28,0.00,0.00,454.06,30106.41,0.00,0.00,245756.50,0.00,0.00,4485.08,0.00,0.00,4437.08,0.00,nan,nan,nan,nan,nan,nan,nan,0.00,0.00,28477.23,0.00,0.00,246294.14,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,nan,
+2024-9-23 21:50:39,2024,10,15,20,26,275879.18,0.00,275879.18,275879.18,353.28,454.06,807.33,-100.78,275891.18,0.00,0.48,0.00,0.00,247401.81,0.00,0.00,353.28,0.00,0.00,454.06,30106.41,0.00,0.00,245756.50,0.00,0.00,4485.08,0.00,0.00,4437.08,0.00,nan,nan,nan,nan,nan,nan,nan,0.00,0.00,28477.23,0.00,0.00,246294.14,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,nan,
+2024-9-23 21:50:46,2024,10,15,20,26,275879.18,0.00,275879.18,275879.18,353.28,454.06,807.33,-100.78,275891.18,0.00,0.48,0.00,0.00,247401.81,0.00,0.00,353.28,0.00,0.00,454.06,30106.41,0.00,0.00,245756.50,0.00,0.00,4485.08,0.00,0.00,4437.08,0.00,nan,nan,nan,nan,nan,nan,nan,0.00,0.00,28477.23,0.00,0.00,246294.14,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,nan,
+2024-9-23 21:50:54,2024,10,15,20,26,275879.18,0.00,275879.18,275879.18,353.28,454.06,807.33,-100.78,275891.18,0.00,0.48,0.00,0.00,247401.81,0.00,0.00,353.28,0.00,0.00,454.06,30106.41,0.00,0.00,245756.50,0.00,0.00,4485.08,0.00,0.00,4437.08,0.00,nan,nan,nan,nan,nan,nan,nan,0.00,0.00,28477.23,0.00,0.00,246294.14,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,nan,
+2024-9-23 21:51:1,2024,10,15,20,26,275879.18,0.00,275879.18,275879.18,353.28,454.06,807.33,-100.78,275891.18,0.00,0.48,0.00,0.00,247401.81,0.00,0.00,353.28,0.00,0.00,454.06,30106.41,0.00,0.00,245756.50,0.00,0.00,4485.08,0.00,0.00,4437.08,0.00,nan,nan,nan,nan,nan,nan,nan,0.00,0.00,28477.23,0.00,0.00,246294.14,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,nan,
+2024-9-23 21:51:9,2024,10,15,20,26,275879.18,0.00,275879.18,275879.18,353.28,454.06,807.33,-100.78,275891.18,0.00,0.48,0.00,0.00,247401.81,0.00,0.00,353.28,0.00,0.00,454.06,30106.41,0.00,0.00,245756.50,0.00,0.00,4485.08,0.00,0.00,4437.08,0.00,nan,nan,nan,nan,nan,nan,nan,0.00,0.00,28477.23,0.00,0.00,246294.14,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,nan,
+2024-9-23 21:51:17,2024,10,15,20,26,275879.18,0.00,275879.18,275879.18,353.28,454.06,807.33,-100.78,275891.18,0.00,0.48,0.00,0.00,247401.81,0.00,0.00,353.28,0.00,0.00,454.06,30106.41,0.00,0.00,245756.50,0.00,0.00,4485.08,0.00,0.00,4437.08,0.00,nan,nan,nan,nan,nan,nan,nan,0.00,0.00,28477.23,0.00,0.00,246294.14,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,nan,
+2024-9-23 21:51:24,2024,10,15,20,26,275879.18,0.00,275879.18,275879.18,353.28,454.06,807.33,-100.78,275891.18,0.00,0.48,0.00,0.00,247401.81,0.00,0.00,353.28,0.00,0.00,454.06,30106.41,0.00,0.00,245756.50,0.00,0.00,4485.08,0.00,0.00,4437.08,0.00,nan,nan,nan,nan,nan,nan,nan,0.00,0.00,28477.23,0.00,0.00,246294.14,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,nan,
+2024-9-23 21:51:32,2024,10,15,20,26,275879.18,0.00,275879.18,275879.18,353.28,454.06,807.33,-100.78,275891.18,0.00,0.48,0.00,0.00,247401.81,0.00,0.00,353.28,0.00,0.00,454.06,30106.41,0.00,0.00,245756.50,0.00,0.00,4485.08,0.00,0.00,4437.08,0.00,nan,nan,nan,nan,nan,nan,nan,0.00,0.00,28477.23,0.00,0.00,246294.14,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,nan,
+2024-9-23 21:51:39,2024,10,15,20,27,275879.18,0.00,275879.18,275879.18,353.28,454.06,807.33,-100.78,275891.18,0.00,0.48,0.00,0.00,247401.81,0.00,0.00,353.28,0.00,0.00,454.06,30106.41,0.00,0.00,245756.50,0.00,0.00,4485.08,0.00,0.00,4437.08,0.00,nan,nan,nan,nan,nan,nan,nan,0.00,0.00,28477.23,0.00,0.00,246294.14,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,nan,
+2024-9-23 21:51:47,2024,10,15,20,27,275879.18,0.00,275879.18,275879.18,353.28,454.06,807.33,-100.78,275891.18,0.00,0.48,0.00,0.00,247401.81,0.00,0.00,353.28,0.00,0.00,454.06,30106.41,0.00,0.00,245756.50,0.00,0.00,4485.08,0.00,0.00,4437.08,0.00,nan,nan,nan,nan,nan,nan,nan,0.00,0.00,28477.23,0.00,0.00,246294.14,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,nan,
\ No newline at end of file
diff --git a/firmware/modbus-sd-VSD-generic/modbus-sd-VSD-generic.ino b/firmware/modbus-sd-VSD-generic/modbus-sd-VSD-generic.ino
new file mode 100644
index 0000000..1ef0acc
--- /dev/null
+++ b/firmware/modbus-sd-VSD-generic/modbus-sd-VSD-generic.ino
@@ -0,0 +1,304 @@
+#include <Wire.h>
+#include <RTClib.h>
+
+#include <NeoSWSerial.h>
+#include <ModbusMaster.h>
+#include "util.h"
+#include "register_map_vsd.h"
+
+// #include <SD.h>
+
+#include <SPI.h>
+#include <SdFat.h>
+#define SD_CS_PIN 10 // Chip Select for SD Card
+// RS485 pins
+#define DE_RE_PIN 4
+#define RX_PIN 8 // SoftwareSerial RX pin
+#define TX_PIN 7 // SoftwareSerial TX pin
+#define SLAVE_ID 101
+#define SERIAL_BAUDRATE 9600
+#define LED_A_PID 3
+#define LED_B_PID 5
+
+// Try to select the best SD card configuration.
+#define SPI_CLOCK SD_SCK_MHZ(50)
+#if HAS_SDIO_CLASS
+#define SD_CONFIG SdioConfig(FIFO_SDIO)
+#elif ENABLE_DEDICATED_SPI
+#define SD_CONFIG SdSpiConfig(SD_CS_PIN, DEDICATED_SPI, SPI_CLOCK)
+#else // HAS_SDIO_CLASS
+#define SD_CONFIG SdSpiConfig(SD_CS_PIN, SHARED_SPI, SPI_CLOCK)
+#endif // HAS_SDIO_CLASS
+
+RTC_DS3231 rtc; // Create an RTC object
+SdFat32 sd;
+// SdExFat sd;
+File dataFile;
+NeoSWSerial modbusSerial(RX_PIN, TX_PIN); // Create a software serial instance
+ModbusMaster node;
+
+unsigned long lastRefreshTime = 0;
+bool headerWritten = false;
+bool booted = false;
+
+void flicker(uint8_t pin, uint8_t times, uint16_t speed)
+{
+  for (int i = 0; i < times; i++)
+  {
+    delay(speed);
+    digitalWrite(pin, HIGH);
+    delay(speed);
+    digitalWrite(pin, LOW);
+  }
+}
+
+void setup()
+{
+  booted = false;
+  pinMode(LED_A_PID, OUTPUT);
+  pinMode(LED_B_PID, OUTPUT);
+  digitalWrite(LED_A_PID, LOW);
+  digitalWrite(LED_B_PID, HIGH);
+
+  Serial.begin(SERIAL_BAUDRATE); // For debugging
+  Serial.println(F("Startup \n"));
+
+  // Initialize RTC
+  if (!rtc.begin())
+  {
+    Serial.println(F("Couldn't find RTC\n"));
+    flicker(LED_B_PID, 4, 1000); // 4 times on LED b is RTC Error
+    digitalWrite(LED_B_PID, HIGH);
+    digitalWrite(LED_A_PID, HIGH);
+    return;
+  }
+
+  if (rtc.lostPower())
+  {
+    Serial.println(F("RTC lost power, let's set the time!\n"));
+    // Comment out the following line once the time is set to avoid resetting on every start
+    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
+    flicker(LED_B_PID, 4, 500); // 6 times fast on LED b is RTC reset
+  }
+
+  Serial.print(F("Time: "));
+  Serial.print(rtc.now().timestamp());
+  Serial.println(F("\n"));
+
+  // Initialize SD card
+  Serial.println(F("SD card initializing..."));
+  pinMode(SD_CS_PIN, OUTPUT);
+
+  // if (!SD.begin(SPI_HALF_SPEED, SD_CS_PIN ))
+  // {
+  //     Serial.println(F("SD card initialization failed!\n"));
+  //     return;
+  // }
+  // Initialize the SD.
+  if (!sd.begin(SD_CONFIG))
+  {
+    flicker(LED_B_PID, 2, 1000);
+    digitalWrite(LED_B_PID, HIGH);
+    sd.initErrorHalt(&Serial);
+
+    // 2 Times slow and stay on, SD Card initilize error
+    return;
+  }
+  Serial.println(F("SD card initialized.\n"));
+
+  Serial.println(F("Initialize RS485 module / Modbus \n"));
+
+  pinMode(DE_RE_PIN, OUTPUT);
+  digitalWrite(DE_RE_PIN, LOW); // Set to LOW for receiving mode initially
+  modbusSerial.begin(SERIAL_BAUDRATE);
+
+  node.begin(SLAVE_ID, modbusSerial);
+  node.preTransmission(preTransmission);
+  node.postTransmission(postTransmission);
+  flicker(LED_B_PID, 10, 100);
+  digitalWrite(LED_B_PID, LOW);
+  booted = true;
+}
+
+void preTransmission()
+{
+  // Serial.println(F("Transmitting Start"));
+  digitalWrite(DE_RE_PIN, HIGH); // Enable RS485 transmit
+  digitalWrite(LED_A_PID, HIGH);
+}
+
+void postTransmission()
+{
+
+  digitalWrite(DE_RE_PIN, LOW); // Disable RS485 transmit
+  digitalWrite(LED_A_PID, LOW);
+  // Serial.println(F("Transmitting End"));
+}
+
+void primeFileDate()
+{
+  if (!dataFile)
+  {
+    Serial.println(F("Error opening file"));
+    return;
+  }
+  DateTime now = rtc.now();
+  // Log the current date and time
+  dataFile.print("\n");
+  dataFile.print(now.year(), DEC);
+  dataFile.print('-');
+  dataFile.print(now.month(), DEC);
+  dataFile.print('-');
+  dataFile.print(now.day(), DEC);
+  dataFile.print(" ");
+  dataFile.print(now.hour(), DEC);
+  dataFile.print(':');
+  dataFile.print(now.minute(), DEC);
+  dataFile.print(':');
+  dataFile.print(now.second(), DEC);
+  dataFile.print(F(","));
+}
+
+String getFilename()
+{
+  DateTime now = rtc.now();
+  String mb = F("pm8k_");
+  mb += now.year();
+  mb += now.month();
+  mb += now.day();
+  mb += F(".csv");
+
+  return mb;
+}
+
+// const char[20] filename = "20240523.csv";
+
+void loop()
+{
+  if (!booted)
+  {
+    Serial.print(F("\nBoot failed, cycle "));
+
+    delay(10000);
+    digitalWrite(LED_A_PID, LOW);
+    return;
+  }
+  delay(100);
+  String writebuffer;
+
+  if (millis() - lastRefreshTime >= 1000)
+  {
+    lastRefreshTime += 1000;
+
+    Serial.print(F("\nTime: "));
+    Serial.print(rtc.now().timestamp());
+    //   Serial.print("\nHeep:");
+    //  Serial.print(ESP.getFreeHeap());
+    const uint16_t totalReg = sizeof(registers) / sizeof(registers[0]);
+    float rawValues[totalReg] = {0};
+    // Open File
+    String filename = getFilename();
+    Serial.print(F("Open Card "));
+    Serial.print(filename.c_str());
+    Serial.print("\n");
+    if (!dataFile.open(filename.c_str(), FILE_WRITE))
+    {
+      flicker(LED_B_PID, 6, 500); // Six quick flickers. SD Card error
+      Serial.println(F("Failed to Open Card "));
+    }
+    if (!headerWritten)
+    {
+      dataFile.print("\nDate Time,");
+      for (int i = 0; i < totalReg; i++)
+      {
+        const uint16_t regaddr = pgm_read_word(&registers[i].regaddr);
+        dataFile.print("@");
+        dataFile.print(regaddr);
+        dataFile.print(",");
+      }
+      headerWritten = true;
+      flicker(LED_A_PID, 50, 10); // 10  flickers, written header
+    }
+    primeFileDate();
+
+    Serial.print("\n");
+    Serial.println(totalReg);
+  
+    // First pass - read all base registers
+    
+    
+    for (int i = 0; i < totalReg; i++) {
+      const uint16_t regaddr = pgm_read_word(&registers[i].regaddr);
+      const uint8_t regtype = pgm_read_word(&registers[i].regtype);
+      
+      if (regaddr > 0 && regtype <= 3) { // Only read direct registers
+        delay(25);
+        uint8_t result = node.readHoldingRegisters(regaddr - 1, 2);
+        delay(25);
+
+        if (result == node.ku8MBSuccess) {
+          switch(regtype) {
+            case 1: 
+              rawValues[i] = node.getResponseBuffer(0);
+              break;
+            case 2:
+              rawValues[i] = getRegisterFloat(node.getResponseBuffer(0), node.getResponseBuffer(1));
+              break;
+            case 3:
+              rawValues[i] = getRegisterInt64(node.getResponseBuffer(0), node.getResponseBuffer(1), 
+                                            node.getResponseBuffer(2), node.getResponseBuffer(3));
+              break;
+          }
+        }
+      }
+    }
+
+    // Second pass - process all registers including derived values
+    for (int i = 0; i < totalReg; i++) {
+      const uint8_t regtype = pgm_read_word(&registers[i].regtype);
+      const float scale = pgm_read_float(&registers[i].scale);
+      float value = 0;
+
+      switch(regtype) {
+        case 1:
+        case 2:
+        case 3:
+          value = rawValues[i] * scale;
+          break;
+        case 4:
+          value = calculateStatusWord(rawValues) * scale;
+          break;
+        case 5:
+          value = calculateThermal(rawValues) * scale;
+          break;
+        case 6:
+          value = calculatePower(rawValues) * scale;
+          break;
+        case 7:
+          value = calculateRPM(rawValues) * scale;
+          break;
+      }
+
+      dataFile.print(value);
+      dataFile.print(",");
+    }
+    
+
+    Serial.print(F("\nRead buffer: "));
+    delay(10);
+
+    if (dataFile)
+    {
+      dataFile.close(); // Close the file
+      Serial.print(F("Data written to SD card: "));
+      Serial.print(filename.c_str());
+      Serial.print(F("\n"));
+    }
+
+    Serial.print(F("\n\n"));
+
+    flicker(LED_A_PID, 4, 100); // Cycle written 4 quick flickers
+  }
+
+  // // Check if the read was successful
+}
diff --git a/firmware/modbus-sd-VSD-generic/modbus-sd-vsd.md b/firmware/modbus-sd-VSD-generic/modbus-sd-vsd.md
new file mode 100644
index 0000000..27ffed2
--- /dev/null
+++ b/firmware/modbus-sd-VSD-generic/modbus-sd-vsd.md
@@ -0,0 +1,120 @@
+# Modbus Reading for Generic VSD Device
+
+This is a specification and implementation of the Arduino-based Modbus data logger for a Generic VSD Device.
+This software is designed for Vivarox EMS and only Vivarox has right to use and modify this software.
+
+## Arduino Implementation:
+
+This project uses an Arduino to connect to Modbus devices, read information, and log it onto an SD card with timestamps.
+
+### Hardware needed:
+
+1. Arduino Board
+   Recommended: Arduino MEGA 2560 (for more memory and I/O pins) or Arduino UNO (for simpler projects).
+   - [Arduino MEGA @ R377.20](https://www.robotics.org.za/MEGA-16U2?search=Arduino%20MEGA%202560)
+   - [UNO R3 with 16U2 USB Interface @ R151.00](https://www.robotics.org.za/UNOR3-16U2?search=%20Arduino%20UNO)
+
+2. RS485 to TTL Module
+   Allows communication between the Arduino and Modbus devices using the RS485 protocol.
+   - [RS485 Module (TTL -> RS485) @ R25.30](https://www.robotics.org.za/RS485-MOD)
+   - [MAX485 Bus Transceiver (4 Pack) @ R16.00](https://www.robotics.org.za/MAX485-DIP?search=MAX485)
+
+3. SD Card Module
+   Allows the Arduino to read from and write data to an SD card.
+   - [Micro SD Card Module @ R25.00](https://www.diyelectronics.co.za/store/memory/512-micro-sd-card-module.html?srsltid=AfmBOoptww8c6kx53xbZWiP2_C_qOE3r9xinyoCO-AZHrZkNQiyxU17c)
+
+4. RTC Module
+   To keep track of the current date and time, even when the Arduino is powered off.
+   - [DS3231 Real Time Clock Module @ R55.20](https://www.robotics.org.za/DS3231-MOD?search=DS3231)
+
+5. Power Supply
+   To power the Arduino and connected peripherals.
+   - [AC Adapter 9V with barrel jack @ R60](https://www.robotics.org.za/AC-9V-2A-2155?search=%20Power%20Supply)
+
+6. LED Indicators
+   Two LEDs for status indication (not included in original cost estimate).
+
+### Wiring
+
+#### RS485 Module to Arduino:
+1. RO (Receiver Output) to Arduino RX (pin 8)
+2. DI (Driver Input) to Arduino TX (pin 7)
+3. DE (Driver Enable) & RE (Receiver Enable) to Arduino digital pin 4
+4. VCC to 5V on Arduino
+5. GND to GND on Arduino
+6. A & B (RS485 differential pair) to Modbus device
+
+#### SD Card Module to Arduino:
+1. VCC to 5V on Arduino
+2. GND to GND on Arduino
+3. MOSI to MOSI (pin 51 on MEGA, pin 11 on UNO)
+4. MISO to MISO (pin 50 on MEGA, pin 12 on UNO)
+5. SCK to SCK (pin 52 on MEGA, pin 13 on UNO)
+6. CS (Chip Select) to digital pin 10
+
+#### RTC Module to Arduino:
+1. VCC to 5V on the Arduino
+2. GND to GND on the Arduino
+3. SDA to SDA (pin 20 on MEGA, pin A4 on UNO)
+4. SCL to SCL (pin 21 on MEGA, pin A5 on UNO)
+
+#### LED Indicators:
+1. LED A to digital pin 3
+2. LED B to digital pin 5
+
+### Software
+
+- Modbus Library: ModbusMaster
+- SD Library: SdFat (more advanced than the standard SD library)
+- RTC Library: RTClib by Adafruit
+- NeoSWSerial: For better latency on software serial communication
+
+### Implementation Details
+
+1. Modbus Configuration:
+   - Slave ID: 101
+   - Baud Rate: 9600
+   - Register map: Defined in separate "register_map_pm8000.h" file
+
+2. Data Logging:
+   - Frequency: Readings taken every second
+   - File Format: CSV (Comma-Separated Values)
+   - Filename: "pm8k_YYYYMMDD.csv" (generated daily based on current date)
+   - Data Structure: Timestamp, followed by register values
+   - Header Row: Includes register addresses for easy identification
+
+3. Register Types Supported:
+   - Float (32-bit)
+   - Integer (32-bit)
+   - Long (64-bit)
+   - String (up to 20 characters)
+
+4. Error Handling and Status Indication:
+   - LED A: Indicates successful data writing and transmission
+   - LED B: Indicates errors (e.g., SD card issues, RTC problems, Modbus communication errors)
+   - Serial output for debugging (9600 baud)
+
+5. Special Features:
+   - Automatic creation of new log file on date change
+   - Header row written only once per file
+   - Robust error handling for SD card, RTC, and Modbus communication
+
+### Programming Workflow
+
+1. Initialize hardware (RTC, SD card, RS485 module)
+2. Set up Modbus communication parameters
+3. Enter main loop:
+   - Read current time from RTC
+   - Read data from Modbus registers
+   - Write timestamped data to SD card
+   - Handle any errors and provide status indication via LEDs
+   - Delay for 1 second before next reading
+
+## Best Practices
+
+- Start by commenting out registers you don't need before adding new ones.
+- If you're using an Arduino UNO, you may need to be more selective about which registers to include due to memory constraints.
+- Test your modifications incrementally to ensure the Arduino can handle the memory load.
+- If you need to read a large number of registers, consider using an Arduino MEGA or a more powerful microcontroller.
+
+By carefully managing the registers in the `register_map_vsd.h` file, you can customize this Modbus reader to suit your specific requirements while staying within the memory limitations of your Arduino board.
diff --git a/firmware/modbus-sd-VSD-generic/register_map_vsd.h b/firmware/modbus-sd-VSD-generic/register_map_vsd.h
new file mode 100644
index 0000000..8110794
--- /dev/null
+++ b/firmware/modbus-sd-VSD-generic/register_map_vsd.h
@@ -0,0 +1,65 @@
+
+#include <stdint.h>
+#ifndef REGISTER_MAP_VSD_H
+#define REGISTER_MAP_VSD_H
+
+struct RegisterMap {
+    uint16_t regaddr;
+    uint8_t regtype;    // 1=UINT16, 2=FLOAT32, 3=INT64, 4=Status, 5=Thermal, 6=Power, 7=RPM
+    uint32_t sr_addr;
+    float scale;
+};
+
+const PROGMEM RegisterMap registers[] = {
+    {0x0000, 4, 402910, 1.0},     // Status Word
+    {3060, 6, 402911, 1.0},       // Min Active Value 
+    {3000, 5, 402912, 1.0},       // Thermal Sense
+    {3110, 2, 402913, 10.0},      // Frequency
+    {1840, 1, 402914, 1.0},       // Running Hours
+    {1840, 1, 402916, 1.0},       // Operating Hours
+    {2700, 2, 402918, 1.0},       // kWh Counter
+    {3060, 2, 402920, 100.0},     // Input Power kW
+    {3060, 6, 402922, 134.102},   // Input Power HP
+    {3006, 2, 402924, 100.0},     // Motor Current
+    {3000, 2, 402926, 100.0},     // Phase I1
+    {3002, 2, 402928, 100.0},     // Phase I2
+    {3004, 2, 402930, 100.0},     // Phase I3
+    {3110, 7, 402932, 60.0},      // Motor RPM
+    {3028, 2, 402934, 10.0},      // Motor Voltage
+    {3060, 6, 402935, 1.0},       // Torque Nm
+    {3000, 5, 402936, 1.0},       // Motor Thermal
+    {3000, 5, 402937, 1.0},       // Heatsink Temp
+    {3000, 5, 402938, 1.0},       // Card Temp
+    {3000, 5, 402939, 1.0},       // Inverter Thermal
+    {3028, 2, 402940, 1.0},       // DC Link Voltage
+    {3060, 6, 402941, 1.0},       // Motor Torque %
+    {3006, 2, 402942, 100.0},     // Inverter Nominal Current
+    {3006, 2, 402944, 100.0},     // Inverter Max Current
+    {0x0000, 4, 402946, 1.0},     // Alarm Word 1
+    {0x0000, 4, 402948, 1.0},     // Alarm Word 2
+    {0x0000, 4, 402950, 1.0},     // Warning Word 1
+    {0x0000, 4, 402952, 1.0},     // Warning Word 2
+    {0x0000, 4, 402954, 1.0},     // Power Ups
+    {3000, 5, 402955, 1.0}        // Over Temp Counter
+};
+
+float calculateStatusWord(float* values) {
+    uint16_t status = 0;
+    if(values[0] > 0) status |= 0x0001;  // Running
+    if(values[1] > 100) status |= 0x0002; // Overload
+    return status;
+}
+
+float calculateThermal(float* values) {
+    return (values[0] / 100.0) * 100.0;
+}
+
+float calculatePower(float* values) {
+    return values[0] * 0.746; // kW to HP conversion
+}
+
+float calculateRPM(float* values) {
+    return values[0] * 60.0;
+}
+
+#endif
\ No newline at end of file
diff --git a/firmware/modbus-sd-VSD-generic/util.h b/firmware/modbus-sd-VSD-generic/util.h
new file mode 100644
index 0000000..fc150b3
--- /dev/null
+++ b/firmware/modbus-sd-VSD-generic/util.h
@@ -0,0 +1,27 @@
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+uint32_t getRegisterUInt32(uint16_t highWord, uint16_t lowWord) {
+    uint32_t val = (highWord << 16) +  lowWord;
+    return val;
+} 
+
+int32_t getRegisterInt32(uint16_t highWord, uint16_t lowWord) {
+    int32_t val = (highWord << 16) +  lowWord;
+    return val;
+} 
+
+int64_t getRegisterInt64(uint16_t word1, uint16_t word2, uint16_t word3, uint16_t word4) {
+    uint64_t val = ((uint64_t)word1 << 48) + ((uint64_t)word2 << 32) + (word3 << 16)  + word4;
+    return val;
+} 
+
+float getRegisterFloat(uint16_t highWord, uint16_t lowWord) {
+    uint32_t floatRaw = ((uint32_t)highWord << 16) | lowWord; 
+    float floatValue;
+    
+    memcpy(&floatValue, &floatRaw, sizeof(float));
+    return floatValue;
+} 
+