diff --git a/.gitignore b/.gitignore
index 4a0b530..31b39c3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,8 @@
 # This file is used to ignore files which are generated
 # ----------------------------------------------------------------------------
 
+build
+
 *~
 *.autosave
 *.a
diff --git a/raptor_eagle_cameralink.h b/raptor_eagle_cameralink.h
index 4fa49eb..59ff57c 100644
--- a/raptor_eagle_cameralink.h
+++ b/raptor_eagle_cameralink.h
@@ -41,18 +41,58 @@ static constexpr char CL_ETX_DONE_LOW = 0x55;
 
 // system state
 
-static constexpr char CL_SYSTEM_STATE_CK_SUM = 0x40;            // 6-th bit
-static constexpr char CL_SYSTEM_STATE_ACK = 0x10;               // 4-th bit
-static constexpr char CL_SYSTEM_STATE_FPGA_BOOT_OK = 0x4;       // 2-nd bit
-static constexpr char CL_SYSTEM_STATE_FPGA_RST_HOLD = 0x2;      // 1-st bit
-static constexpr char CL_SYSTEM_STATE_FPGA_EEPROM_COMMS = 0x1;  // 0-th bit
+static constexpr size_t CL_SYSTEM_STATUS_FPGA_EEPROM_COMMS_BIT = 0;
+static constexpr size_t CL_SYSTEM_STATUS_FPGA_RST_HOLD_BIT = 1;
+static constexpr size_t CL_SYSTEM_STATUS_FPGA_BOOT_OK_BIT = 2;
+static constexpr size_t CL_SYSTEM_STATUS_ACK_BIT = 4;
+static constexpr size_t CL_SYSTEM_STATUS_CK_SUM_BIT = 6;
+
+static constexpr char CL_SYSTEM_STATUS_CK_SUM = 0x40;            // 6-th bit
+static constexpr char CL_SYSTEM_STATUS_ACK = 0x10;               // 4-th bit
+static constexpr char CL_SYSTEM_STATUS_FPGA_BOOT_OK = 0x4;       // 2-nd bit
+static constexpr char CL_SYSTEM_STATUS_FPGA_RST_HOLD = 0x2;      // 1-st bit
+static constexpr char CL_SYSTEM_STATUS_FPGA_EEPROM_COMMS = 0x1;  // 0-th bit
+
+namespace details
+{
+
+static constexpr std::string_view cl_system_status_bit(const size_t pos)
+{
+    return pos == CL_SYSTEM_STATUS_FPGA_EEPROM_COMMS_BIT ? "FPGA COMMS EPROM ENABLED"
+           : pos == CL_SYSTEM_STATUS_FPGA_RST_HOLD_BIT   ? "HOLD FPGA RST"
+           : pos == CL_SYSTEM_STATUS_FPGA_BOOT_OK_BIT    ? "FPGA BOOTED OK"
+           : pos == CL_SYSTEM_STATUS_ACK_BIT             ? "COMM ACK ENABLED"
+           : pos == CL_SYSTEM_STATUS_CK_SUM_BIT          ? "CHECKSUM ENABLED"
+                                                         : "UNKNOWN";
+}
+
+}  // namespace details
+
 
 // FPGA CTRL register
 
+static constexpr size_t CL_FPGA_CTRL_REG_HIGH_GAIN_BIT = 7;      // 7-th bit (0 if high pre-amp gain)
+static constexpr size_t CL_FPGA_CTRL_REG_TEMP_TRIP_RST_BIT = 1;  // 1-st bit
+static constexpr size_t CL_FPGA_CTRL_REG_ENABLE_TEC_BIT = 0;     // 0-th bit
+
 static constexpr char CL_FPGA_CTRL_REG_HIGH_GAIN = 0x80;    // 7-th bit (0 if high pre-amp gain)
 static constexpr char CL_FPGA_CTRL_REG_TMP_TRIP_RST = 0x2;  // 1-st bit
 static constexpr char CL_FPGA_CTRL_REG_ENABLE_TEC = 0x1;    // 0-th bit
 
+
+namespace details
+{
+
+static constexpr std::string_view cl_fpga_ctrl_reg_bit(const size_t pos)
+{
+    return pos == CL_FPGA_CTRL_REG_HIGH_GAIN_BIT       ? "HIGH GAIN ENABLED"
+           : pos == CL_FPGA_CTRL_REG_TEMP_TRIP_RST_BIT ? "OVERTEMP TRIPPED"
+           : pos == CL_FPGA_CTRL_REG_ENABLE_TEC_BIT    ? "TEC ENABLED"
+                                                       : "UNKNOWN";
+}
+
+}  // namespace details
+
 // trigger mode
 
 static constexpr char CL_TRIGGER_MODE_ENABLE_RISING_EDGE = 0x80;  // 7-th bit
@@ -96,11 +136,14 @@ static constexpr double DAC_CALIBRATION_POINT_2 = 40.0;  // at +40 Celcius degre
 static constexpr std::initializer_list<unsigned char> CL_EXPTIME_ADDR = {0xED, 0xEE, 0xEF, 0xF0, 0xF1};
 static constexpr std::initializer_list<unsigned char> CL_FRAMERATE_ADDR = {0xDC, 0xDD, 0xDE, 0xDF, 0xE0};
 
-static constexpr std::initializer_list<unsigned char> CL_ROILEFT_ADDR = {0xB6, 0xB7};
-static constexpr std::initializer_list<unsigned char> CL_ROITOP_ADDR = {0xBA, 0xBB};
+static constexpr std::initializer_list<unsigned char> CL_ROI_STARTX_ADDR = {0xB6, 0xB7};
+static constexpr std::initializer_list<unsigned char> CL_ROI_STARTY_ADDR = {0xBA, 0xBB};
 static constexpr std::initializer_list<unsigned char> CL_ROIWIDTH_ADDR = {0xB4, 0xB5};
 static constexpr std::initializer_list<unsigned char> CL_ROIHEIGHT_ADDR = {0xB8, 0xB9};
 
+static constexpr std::initializer_list<unsigned char> CL_XBIN_ADDR = {0xA1};
+static constexpr std::initializer_list<unsigned char> CL_YBIN_ADDR = {0xA2};
+
 /* COMMANDS  */
 
 static unsigned char CL_COMMAND_SET_ADDRESS[] = {
diff --git a/raptor_eagle_ccd.cpp b/raptor_eagle_ccd.cpp
index 9fa4dda..1b9bcdb 100644
--- a/raptor_eagle_ccd.cpp
+++ b/raptor_eagle_ccd.cpp
@@ -150,6 +150,148 @@ RaptorEagleCCD::~RaptorEagleCCD()
 }
 
 
+
+/*                                  PUBLIC METHODS                                  */
+
+
+/*   system state get/set   */
+
+std::bitset<8> RaptorEagleCCD::getSystemState()
+{
+    std::lock_guard lock_guard(_camlinkMutex);
+
+    byte_seq_t ans;
+
+    clWrite({0x49});
+    clReadAndCheckAck(ans);
+
+    std::bitset<8> bits{ans[0]};
+
+    logDebug("Get system state as 0b{} bits", bits.to_string());
+
+    return bits;
+}
+
+
+void RaptorEagleCCD::setSystemState(const std::bitset<8>& bits)
+{
+    std::lock_guard lock_guard(_camlinkMutex);
+
+    logDebug("Try to set system state to 0b{} bits", bits.to_string());
+
+    uint8_t status = static_cast<uint8_t>(bits.to_ulong());
+
+    clWrite({0x4F, status});
+    clReadAndCheckAck();
+}
+
+
+void RaptorEagleCCD::setSystemStateBit(const size_t pos)
+{
+    std::lock_guard lock_guard(_camlinkMutex);
+
+    auto bits = getSystemState();
+
+    logDebug("Set system state bit {}", details::cl_system_status_bit(pos));
+    bits.set(pos);
+
+    setSystemState(bits);
+}
+
+
+void RaptorEagleCCD::clearSystemStateBit(const size_t pos)
+{
+    std::lock_guard lock_guard(_camlinkMutex);
+
+    auto bits = getSystemState();
+
+    logDebug("Clear system state bit {}", details::cl_system_status_bit(pos));
+    bits.reset(pos);
+
+    setSystemState(bits);
+}
+
+
+void RaptorEagleCCD::flipSystemStateBit(const size_t pos)
+{
+    std::lock_guard lock_guard(_camlinkMutex);
+
+    auto bits = getSystemState();
+
+    logDebug("Flip system state bit {}", details::cl_system_status_bit(pos));
+    bits.flip(pos);
+
+    setSystemState(bits);
+}
+
+
+// FPGS control register get/set
+
+std::bitset<8> RaptorEagleCCD::getFPGAState()
+{
+    std::lock_guard log_guard(_camlinkMutex);
+
+    auto ans = readRegisters({0x00});
+
+    std::bitset<8> bits{ans[0]};
+
+    logDebug("Get FPGS control register as 0b{} bits", bits.to_string());
+
+    return bits;
+}
+
+
+void RaptorEagleCCD::setFPGAState(const std::bitset<8>& bits)
+{
+    std::lock_guard lock_guard(_camlinkMutex);
+
+    logDebug("Try to set FPGA control register to 0b{} bits", bits.to_string());
+
+    uint8_t status = static_cast<uint8_t>(bits.to_ulong());
+
+    writeRegisters({0x00}, {status});
+}
+
+
+void RaptorEagleCCD::setFPGAStateBit(const size_t pos)
+{
+    std::lock_guard lock_guard(_camlinkMutex);
+
+    auto bits = getFPGAState();
+
+    logDebug("Set FPGA control register bit {}", details::cl_fpga_ctrl_reg_bit(pos));
+    bits.set(pos);
+
+    setFPGAState(bits);
+}
+
+
+void RaptorEagleCCD::clearFPGAStateBit(const size_t pos)
+{
+    std::lock_guard lock_guard(_camlinkMutex);
+
+    auto bits = getFPGAState();
+
+    logDebug("Clear FPGA control register bit {}", details::cl_fpga_ctrl_reg_bit(pos));
+    bits.reset(pos);
+
+    setFPGAState(bits);
+}
+
+
+void RaptorEagleCCD::flipFPGAStateBit(const size_t pos)
+{
+    std::lock_guard lock_guard(_camlinkMutex);
+
+    auto bits = getFPGAState();
+
+    logDebug("Flip FPGA control register bit {}", details::cl_fpga_ctrl_reg_bit(pos));
+    bits.flip(pos);
+
+    setFPGAState(bits);
+}
+
+
 /*  PRIVATE METHODS  */
 
 void RaptorEagleCCD::initCamera(int unitmap)
@@ -193,10 +335,67 @@ void RaptorEagleCCD::closePIXCI()
 }
 
 
+/*  SYSTEM STATUS  */
+
+
+/*------------*/
+
+const RaptorEagleCCD::SystemStatus RaptorEagleCCD::getSystemStatus()
+{
+    std::lock_guard lock_guard(_camlinkMutex);
+
+    byte_seq_t ans;
+
+    clWrite({0x49});
+    clReadAndCheckAck(ans);
+
+    SystemStatus status;
+    status.ackEnabled = ans[0] & CL_SYSTEM_STATUS_ACK;
+    status.checkSumEnabled = ans[0] & CL_SYSTEM_STATUS_CK_SUM;
+    status.bootedFPGA = ans[0] & CL_SYSTEM_STATUS_FPGA_BOOT_OK;
+    status.commsFPGAEnabled = ans[0] & CL_SYSTEM_STATUS_FPGA_EEPROM_COMMS;
+    status.holdFPGAInReset = !(ans[0] & CL_SYSTEM_STATUS_FPGA_RST_HOLD);  // hold in RESET if bit is 0
+
+    return status;
+}
+
+void RaptorEagleCCD::setSystemStatus(const RaptorEagleCCD::SystemStatus& status)
+{
+    uint8_t st = 0;
+
+    if (status.ackEnabled)
+        st |= CL_SYSTEM_STATUS_ACK;
+
+    if (status.checkSumEnabled)
+        st |= CL_SYSTEM_STATUS_CK_SUM;
+
+    if (status.bootedFPGA)
+        st |= CL_SYSTEM_STATUS_FPGA_BOOT_OK;
+
+    if (status.commsFPGAEnabled)
+        st |= CL_SYSTEM_STATUS_FPGA_EEPROM_COMMS;
+
+    if (status.holdFPGAInReset)
+        st &= ~CL_SYSTEM_STATUS_FPGA_RST_HOLD;
+
+    setSystemStatus(st);
+}
+
+void RaptorEagleCCD::setSystemStatus(const uint8_t& status)
+{
+    std::lock_guard lock_guard(_camlinkMutex);
+
+    clWrite({0x4F, status});
+    clReadAndCheckAck();
+}
+
+
 /*  CameraLink-RELATED METHODS  */
 
 size_t RaptorEagleCCD::clRead(byte_seq_t& bytes)
 {
+    std::lock_guard lock_guard(_camlinkMutex);
+
     size_t nbytes;
 
     // how many byte are available
@@ -230,6 +429,8 @@ size_t RaptorEagleCCD::clRead(byte_seq_t& bytes)
 
 size_t RaptorEagleCCD::clReadAndCheckAck(byte_seq_t& bytes)
 {
+    std::lock_guard lock_guard(_camlinkMutex);
+
     auto nbytes = clRead(bytes);
 
     if (_clCommandAckBit && nbytes) {
@@ -253,6 +454,8 @@ size_t RaptorEagleCCD::clReadAndCheckAck()
 // 'bytes' must contain only data without trailing ETX and checksum bytes!
 size_t RaptorEagleCCD::clWrite(const byte_seq_t& bytes)
 {
+    std::lock_guard lock_guard(_camlinkMutex);
+
     static unsigned char etx_checksum_bytes[] = {CL_ETX, 0xFF};
 
     if (bytes.empty()) {
@@ -322,7 +525,7 @@ RaptorEagleCCD::byte_seq_t RaptorEagleCCD::readRegisters(const RaptorEagleCCD::b
                                                          byte_seq_t set_addr_cmd)
 {
     // to protect in multi-threading environment (multiple read-write operations, see below)
-    std::lock_guard<std::mutex> lock_guard(_camlinkMutex);
+    std::lock_guard lock_guard(_camlinkMutex);
 
     byte_seq_t reg_vals, ans(3);
 
@@ -359,7 +562,7 @@ RaptorEagleCCD::byte_seq_t RaptorEagleCCD::readRegisters(const RaptorEagleCCD::b
 void RaptorEagleCCD::writeRegisters(const byte_seq_t& addrs, const byte_seq_t& values)
 {
     // to protect in multi-threading environment (multiple read-write operations, see below)
-    std::lock_guard<std::mutex> lock_guard(_camlinkMutex);
+    std::lock_guard lock_guard(_camlinkMutex);
 
     if (addrs.empty() || values.empty()) {
         logWarn("Registers addresses or values array is an empty! Nothing to do!");
@@ -499,7 +702,8 @@ void RaptorEagleCCD::initAttrComm()
         });
 
 
-    auto create12BitAttr = [this](std::string_view name, auto reg_addrs, std::string_view log_mark) {
+    // helper to setup 12-bit register attributes
+    auto create12BitAttr = [this](std::string_view name, auto reg_addrs, auto&& validator, std::string_view log_mark) {
         return RaptorEagleCCD::attribute_t(
             name,
             [this, reg_addrs, log_mark]() {
@@ -510,19 +714,152 @@ void RaptorEagleCCD::initAttrComm()
 
                 return v;
             },
-            [this, reg_addrs, log_mark](const uint16_t& val) { logDebug("Try to set {} ...", log_mark); });
+            [this, reg_addrs, log_mark,
+             wrapper = adc::traits::adc_pf_wrapper(std::forward<decltype(validator)>(validator))](
+                const uint16_t& val) mutable {
+                logDebug("Try to set {} to {} ...", log_mark, val);
+
+                // call perfectly-forwarded validator
+                auto v_res = std::forward<std::tuple_element_t<0, decltype(wrapper)>>(std::get<0>(wrapper))(val);
+                if (v_res.second.size()) {  // warning
+                    logWarn("{}", v_res.second);
+                }
+
+                auto bytes = details::convertUIntTo12Bit(v_res.first);
+                writeRegisters(reg_addrs, bytes);
+
+                logDebug("{} is set to {}", log_mark, v_res.first);
+            });
     };
 
     // ROI left
-    addAttribute(
-        CAMERA_ATTR_ROI_LEFT,
-        [this]() {
-            auto bytes = readRegisters(CL_ROILEFT_ADDR);
-            uint16_t v = details::convert12BitToUInt(bytes);
+    addAttribute(create12BitAttr(
+        CAMERA_ATTR_ROI_STARTX, CL_ROI_STARTX_ADDR,
+        [this](const uint16_t& val) {  // validator
+            std::pair<uint16_t, std::string> res{val, ""};
 
-            logTrace("Return ROI X-offset (current value: {})", v);
+            if (val < 1) {
+                res.first = 1;
+                res.second = "The ROI X-offset must start from 1 (FITS notation)";
+            } else if (val > _dimCCD[0]) {
+                res.first = _dimCCD[0];
+                res.second = std::format(
+                    "The ROI X-offset must not be greater than CCD X-dimension of {} pixels (FITS notation)",
+                    _dimCCD[0]);
+            }
 
-            return v;
+            return res;
         },
-        [this](const uint16_t& val) {});
+        "ROI X-offset"));
+
+
+    // ROI top
+    addAttribute(create12BitAttr(
+        CAMERA_ATTR_ROI_STARTY, CL_ROI_STARTY_ADDR,
+        [this](const uint16_t& val) {  // validator
+            std::pair<uint16_t, std::string> res{val, ""};
+
+            if (val < 1) {
+                res.first = 1;
+                res.second = "The ROI Y-offset must start from 1 (FITS notation)";
+            } else if (val > _dimCCD[1]) {
+                res.first = _dimCCD[1];
+                res.second = std::format(
+                    "The ROI Y-offset must not be greater than CCD Y-dimension of {} pixels (FITS notation)",
+                    _dimCCD[1]);
+            }
+
+            return res;
+        },
+        "ROI Y-offset"));
+
+
+    // ROI width
+    addAttribute(create12BitAttr(
+        CAMERA_ATTR_ROI_WIDTH, CL_ROIWIDTH_ADDR,
+        [this](const uint16_t& val) {  // validator
+            std::pair<uint16_t, std::string> res{val, ""};
+
+            if (val < 1) {
+                res.first = 1;
+                res.second = "The ROI width must start from 1";
+            } else if (val > _dimCCD[0]) {
+                res.first = _dimCCD[0];
+                res.second = std::format(
+                    "The ROI width must not be greater than CCD dimension of {} pixels (FITS notation)", _dimCCD[0]);
+            }
+
+            return res;
+        },
+        "ROI width"));
+
+    // ROI height
+    addAttribute(create12BitAttr(
+        CAMERA_ATTR_ROI_HEIGHT, CL_ROIHEIGHT_ADDR,
+        [this](const uint16_t& val) {  // validator
+            std::pair<uint16_t, std::string> res{val, ""};
+
+            // ROI height can be 0 (see Eagle V 4240 instruction manual)
+            if (val > _dimCCD[1]) {
+                res.first = _dimCCD[1];
+                res.second = std::format(
+                    "The ROI height must not be greater than CCD dimension of {} pixels (FITS notation)", _dimCCD[1]);
+            }
+
+            return res;
+        },
+        "ROI height"));
+
+    // X-bin
+    addAttribute(create12BitAttr(
+        CAMERA_ATTR_XBIN, CL_XBIN_ADDR,
+        [this](const uint16_t& val) {  // validator (1-32, 64)
+            std::pair<uint16_t, std::string> res{val, ""};
+
+            if (val < 1) {
+                res.first = 1;
+                res.second = "The XBIN must start from 1";
+            } else if ((val > EAGLE_CAMERA_MAX_XBIN[0]) && (val < EAGLE_CAMERA_MAX_XBIN[1])) {
+                // set to the closest
+                res.first = (val - EAGLE_CAMERA_MAX_XBIN[0]) < (EAGLE_CAMERA_MAX_XBIN[1] - val)
+                                ? EAGLE_CAMERA_MAX_XBIN[0]
+                                : EAGLE_CAMERA_MAX_XBIN[1];
+
+                res.second = std::format("The XBIN must not be within {} and {}", EAGLE_CAMERA_MAX_XBIN[0],
+                                         EAGLE_CAMERA_MAX_XBIN[1]);
+            } else if (val > EAGLE_CAMERA_MAX_XBIN[1]) {
+                res.first = EAGLE_CAMERA_MAX_XBIN[1];
+                res.second = std::format("The XBIN must not be greater than {}", EAGLE_CAMERA_MAX_XBIN[1]);
+            }
+
+            return res;
+        },
+        "XBIN"));
+
+
+    // Y-bin
+    addAttribute(create12BitAttr(
+        CAMERA_ATTR_YBIN, CL_YBIN_ADDR,
+        [this](const uint16_t& val) {  // validator (1-32, 64)
+            std::pair<uint16_t, std::string> res{val, ""};
+
+            if (val < 1) {
+                res.first = 1;
+                res.second = "The YBIN must start from 1";
+            } else if ((val > EAGLE_CAMERA_MAX_YBIN[0]) && (val < EAGLE_CAMERA_MAX_YBIN[1])) {
+                // set to the closest
+                res.first = (val - EAGLE_CAMERA_MAX_YBIN[0]) < (EAGLE_CAMERA_MAX_YBIN[1] - val)
+                                ? EAGLE_CAMERA_MAX_YBIN[0]
+                                : EAGLE_CAMERA_MAX_YBIN[1];
+
+                res.second = std::format("The YBIN must not be within {} and {}", EAGLE_CAMERA_MAX_YBIN[0],
+                                         EAGLE_CAMERA_MAX_YBIN[1]);
+            } else if (val > EAGLE_CAMERA_MAX_YBIN[1]) {
+                res.first = EAGLE_CAMERA_MAX_YBIN[1];
+                res.second = std::format("The YBIN must not be greater than {}", EAGLE_CAMERA_MAX_XBIN[1]);
+            }
+
+            return res;
+        },
+        "YBIN"));
 }
diff --git a/raptor_eagle_ccd.h b/raptor_eagle_ccd.h
index f53cf6e..1b08dfc 100644
--- a/raptor_eagle_ccd.h
+++ b/raptor_eagle_ccd.h
@@ -12,10 +12,15 @@
 #include "raptor_eagle_exception.h"
 
 
-class RaptorEagleCCD : public adc::AdcGenericDevice<std::string, adc::AdcDeviceAttribute<>, adc::AdcDeviceCommand<>>,
+class RaptorEagleCCD : public adc::AdcGenericDevice<std::string,
+                                                    adc::AdcDeviceAttribute<std::string_view>,
+                                                    adc::AdcDeviceCommand<std::string_view>>,
                        adc::AdcSpdlogLogger
 {
-    typedef adc::AdcGenericDevice<std::string, adc::AdcDeviceAttribute<>, adc::AdcDeviceCommand<>> base_t;
+    typedef adc::AdcGenericDevice<std::string,
+                                  adc::AdcDeviceAttribute<std::string_view>,
+                                  adc::AdcDeviceCommand<std::string_view>>
+        base_t;
 
 public:
     /*  some Eagle V camera constants   */
@@ -24,11 +29,13 @@ public:
     static constexpr size_t EAGLE_CAMERA_MAX_FRAMERATE = 0xFFFFFFFFFF * 40;    // in MHz (0xFFFFFFFFFF * 40MHz)
 
     static constexpr uint16_t EAGLE_CAMERA_CCDDIM[] = {2048, 2048};
+    static constexpr uint16_t EAGLE_CAMERA_MAX_XBIN[] = {32, 64};
+    static constexpr uint16_t EAGLE_CAMERA_MAX_YBIN[] = {32, 64};
 
-    static constexpr std::string_view CAMERA_ATTR_HBIN{"HBIN"};
-    static constexpr std::string_view CAMERA_ATTR_VBIN{"VBIN"};
-    static constexpr std::string_view CAMERA_ATTR_ROI_LEFT{"ROI_LEFT"};
-    static constexpr std::string_view CAMERA_ATTR_ROI_TOP{"ROI_TOP"};
+    static constexpr std::string_view CAMERA_ATTR_XBIN{"XBIN"};
+    static constexpr std::string_view CAMERA_ATTR_YBIN{"YBIN"};
+    static constexpr std::string_view CAMERA_ATTR_ROI_STARTX{"ROI_STARTX"};
+    static constexpr std::string_view CAMERA_ATTR_ROI_STARTY{"ROI_STARTY"};
     static constexpr std::string_view CAMERA_ATTR_ROI_WIDTH{"ROI_WIDTH"};
     static constexpr std::string_view CAMERA_ATTR_ROI_HEIGHT{"ROI_HEIGHT"};
     static constexpr std::string_view CAMERA_ATTR_GAIN{"GAIN"};
@@ -70,17 +77,35 @@ public:
 
     ~RaptorEagleCCD();
 
+    std::bitset<8> getSystemState();
+    void setSystemState(const std::bitset<8>& bits);
+    void setSystemStateBit(const size_t bit_pos);
+    void clearSystemStateBit(const size_t bit_pos);
+    void flipSystemStateBit(const size_t bit_pos);
+
+    std::bitset<8> getFPGAState();
+    void setFPGAState(const std::bitset<8>& bits);
+    void setFPGAStateBit(const size_t bit_pos);
+    void clearFPGAStateBit(const size_t bit_pos);
+    void flipFPGAStateBit(const size_t bit_pos);
+
+    const SystemStatus getSystemStatus();
+    void setSystemStatus(const SystemStatus&);
+    void setSystemStatus(const uint8_t&);
+
 private:
     typedef std::vector<unsigned char> byte_seq_t;
 
     std::string _epixFmtVideoFilename;
     int _cameraUnitmap;
 
+    uint16_t _dimCCD[2] = {2048, 2048};  // init to E2V 4240 CCD dimension
+
     // CameraLink read/write setup flags
     uint8_t _clCommandAckBit;
     uint8_t _clChecksumBit;
 
-    std::mutex _camlinkMutex;
+    std::recursive_mutex _camlinkMutex;
 
     // attributes inner variables
     size_t _frameNumbers;