diff --git a/src/GcLogger.cpp b/src/GcLogger.cpp
index dea5b9f..0022edf 100644
--- a/src/GcLogger.cpp
+++ b/src/GcLogger.cpp
@@ -6,7 +6,7 @@
 #include "GcLogger.h"
 
 
-void GcLogger::setup(const string& deviceSerialPort, int deviceBaudRate) {
+void GcLogger::setup(const string &deviceSerialPort, int deviceBaudRate) {
     baudRate = deviceBaudRate;
     serialPort = deviceSerialPort;
 
@@ -14,7 +14,7 @@ void GcLogger::setup(const string& deviceSerialPort, int deviceBaudRate) {
 
     device = new GmcDevice(deviceSerialPort, deviceBaudRate);
 
-    if(!device->isConnected()) {
+    if (!device->isConnected()) {
         cout << "Failed to connect to device!" << endl;
     } else {
         cout << "Device connected!" << endl;
@@ -44,7 +44,7 @@ int GcLogger::run() {
     }
 }
 
-void GcLogger::readIni(const string& filePath) {
+void GcLogger::readIni(const string &filePath) {
     cout << "Reading configuration from: " << filePath << endl;
 
     ifstream is(filePath);
diff --git a/src/GcLogger.h b/src/GcLogger.h
index dca55f4..53ce1ab 100644
--- a/src/GcLogger.h
+++ b/src/GcLogger.h
@@ -21,10 +21,11 @@ class GcLogger {
     inipp::Ini<char> ini;
     GmcDevice *device;
 
-    void setup(const string&, int);
+    void setup(const string &, int);
 
 public:
-    void readIni(const string&);
+    void readIni(const string &);
+
     int run();
 };
 
diff --git a/src/GmcDevice.cpp b/src/GmcDevice.cpp
index 88c6bd9..d79d40f 100644
--- a/src/GmcDevice.cpp
+++ b/src/GmcDevice.cpp
@@ -4,14 +4,14 @@
 
 #include "GmcDevice.h"
 
-GmcDevice::GmcDevice(const string& serialPort, int baud) {
+GmcDevice::GmcDevice(const string &serialPort, int baud) {
     device = new SerialPort(serialPort, baud);
 
-    if(!device->isOpen()) {
+    if (!device->isOpen()) {
         cout << "Failed to open gmc device!" << endl;
     } else {
         cout << "Connection to gmc device established!" << endl;
-        if(!setHeartbeatOff()) {
+        if (!setHeartbeatOff()) {
             cout << "Failed to disable heartbeat!" << endl;
             device->serialClose();
         }
@@ -27,16 +27,16 @@ bool GmcDevice::close() {
 }
 
 int GmcDevice::getCPM() {
-    if(!device->isOpen()) {
+    if (!device->isOpen()) {
         cout << "Device is not connected, failed to read CPM!" << endl;
         return -1;
     }
 
     string cmd = "<GETCPM>>";
-    string result;
+    vector<uint8_t> result;
 
-    if(device->serialWrite(cmd) == cmd.length()) {
-        result = device->serialRead(2); // cpm result has size 2
+    if (device->serialWrite(cmd) == cmd.length()) {
+        result = device->serialRead(2);  // cpm result has size 2
     } else {
         cout << "Failed to send command to device!" << endl;
     }
@@ -45,47 +45,49 @@ int GmcDevice::getCPM() {
 }
 
 float GmcDevice::getTemperature() {
-    if(!device->isOpen()) {
+    if (!device->isOpen()) {
         cout << "Device is not connected, failed to read temperature!" << endl;
         return -1;
     }
 
     string cmd = "<GETTEMP>>";
-    string result;
+    vector<uint8_t> result;
 
-    if(device->serialWrite(cmd) == cmd.length()) {
-        result = device->serialRead(4); // temp result has size 4
+    if (device->serialWrite(cmd) == cmd.length()) {
+        result = device->serialRead(4);  // temp result has size 4
     } else {
         cout << "Failed to send command to device!" << endl;
     }
 
-    int sign =  result[2] == 0 ? 1 : -1;
-    float temp = result[0];
-    temp += (float) result[1] / 10;
+    int sign = result[2] == 0 ? 1 : -1;
+    float temp = result[0];  // integer part
+    temp += static_cast<float>(result[1] / 10.0); // float part
     temp = temp * sign;
     return temp;
 }
 
 string GmcDevice::getVersion() {
-    if(!device->isOpen()) {
+    if (!device->isOpen()) {
         cout << "Device is not connected, failed to read version!" << endl;
         return "";
     }
 
     string cmd = "<GETVER>>";
-    string result;
+    vector<uint8_t> result;
 
-    if(device->serialWrite(cmd) == cmd.length()) {
-        result = device->serialRead(14); // version result has size 14
+    if (device->serialWrite(cmd) == cmd.length()) {
+        result = device->serialRead(14);  // version result has size 14
     } else {
         cout << "Failed to send command to device!" << endl;
     }
 
-    return result;
+    string strResult(result.begin(), result.end());
+
+    return strResult;
 }
 
 bool GmcDevice::setHeartbeatOff() {
-    if(!device->isOpen()) {
+    if (!device->isOpen()) {
         cout << "Device is not connected, failed to disable heartbeat!" << endl;
         return false;
     }
@@ -93,8 +95,8 @@ bool GmcDevice::setHeartbeatOff() {
     string cmd = "<HEARTBEAT0>>";
     string result;
 
-    if(device->serialWrite(cmd) == cmd.length()) {
-        return device->clearInput(100); // clear 100 chars
+    if (device->serialWrite(cmd) == cmd.length()) {
+        return device->clearInput(100);  // clear 100 chars
     } else {
         cout << "Failed to send command to device!" << endl;
     }
diff --git a/src/GmcDevice.h b/src/GmcDevice.h
index f193914..37ed2db 100644
--- a/src/GmcDevice.h
+++ b/src/GmcDevice.h
@@ -11,15 +11,20 @@ class GmcDevice {
     SerialPort *device;
 
 public:
-    GmcDevice(const string& serialPort, int baud);
+    GmcDevice(const string &serialPort, int baud);
+
     ~GmcDevice();
 
     bool close();
+
     bool isConnected();
 
     int getCPM();
+
     float getTemperature();
+
     string getVersion();
+
     bool setHeartbeatOff();
 };
 
diff --git a/src/SerialPort.cpp b/src/SerialPort.cpp
index d8496d9..1d217e8 100644
--- a/src/SerialPort.cpp
+++ b/src/SerialPort.cpp
@@ -60,12 +60,12 @@ SerialPort::~SerialPort() {
     serialClose();
 }
 
-string SerialPort::serialRead(int length) {
-    char *buf = (char *) calloc(length + 1, sizeof(char));
+vector<uint8_t> SerialPort::serialRead(int length) {
+    auto *buf = reinterpret_cast<uint8_t *> (calloc(length, sizeof(uint8_t)));
 
     read(fd, buf, length);
 
-    string result(buf);
+    vector<uint8_t> result(buf, buf + length);
     free(buf);
 
     return result;
diff --git a/src/SerialPort.h b/src/SerialPort.h
index c65ae2e..f961969 100644
--- a/src/SerialPort.h
+++ b/src/SerialPort.h
@@ -7,6 +7,7 @@
 
 #include <iostream>
 #include <string>
+#include <vector>
 
 #include <termios.h> // POSIX terminal control definitions
 #include <unistd.h>
@@ -19,19 +20,24 @@ class SerialPort {
     struct termios tio;
     int tioBaud;
 
-    int getTioBaud(int);
+    static int getTioBaud(int);
 
 public:
     // Constructor
     SerialPort();
-    SerialPort(const string&, int);
+
+    SerialPort(const string &, int);
+
     ~SerialPort();
 
     bool isOpen();
+
     bool serialClose();
 
-    string serialRead(int);
-    int serialWrite(const string&);
+    vector<uint8_t> serialRead(int);
+
+    int serialWrite(const string &);
+
     bool clearInput(int);
 };