diff --git a/front-generator/template/common/all-params-methods.js.j2 b/front-generator/template/common/all-params-methods.js.j2
index 82d61cd..5d373f5 100644
--- a/front-generator/template/common/all-params-methods.js.j2
+++ b/front-generator/template/common/all-params-methods.js.j2
@@ -13,7 +13,7 @@
 
                 this.submitStatus.{{ g['group'] }} = true
                 fetch('/api/set/{{ g["group"] }}', {method: 'POST', headers: {'Content-Type': 'application/json'}, body: JSON.stringify(query) })
-                    .then(async (resp) => { this.update{{ g['group'] | title }}Settings(await resp.json()) })
+                    .then(async (resp) => { let vals = await resp.json(); if (vals['status'] !== 'ok') { throw new Error(vals['error'] ? vals['error'] : "Server returns undefined error") } this.update{{ g['group'] | title }}Settings(vals) })
                     .catch((reason) => { alert(`Ошибка при применении настроек: ${reason}`) })
                     .finally(() => { this.submitStatus.{{ g['group'] }} = false })
             },
diff --git a/front-generator/template/common/qos-methods.js.j2 b/front-generator/template/common/qos-methods.js.j2
index c234bf9..9083e7c 100644
--- a/front-generator/template/common/qos-methods.js.j2
+++ b/front-generator/template/common/qos-methods.js.j2
@@ -63,6 +63,7 @@
                     body: JSON.stringify(query)
                 }).then(async (resp) => {
                     this.submitStatusQos = false
+                    if (resp['error']) { throw new Error(resp['error']) }
                     this.updateQosSettings(await resp.json())
                 }).catch((reason) => {
                     this.submitStatusQos = false
diff --git a/src/main.cpp b/src/main.cpp
index 5cbd7f7..346b306 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -281,7 +281,7 @@ public:
                 rep.content.insert(rep.content.end(), result.c_str(), result.c_str() + result.size());
             } catch (std::exception& e) {
                 BOOST_LOG_TRIVIAL(error) << "WebHandle(/api/set/qos): Can't set QoS settings: " << e.what();
-                const std::string result = R"({"status":"error"})";
+                const std::string result = R"({"status": "error", "error": )" + api_driver::buildEscapedString(e.what()) + "}";
                 rep.content.insert(rep.content.end(), result.c_str(), result.c_str() + result.size());
             }
         }));
@@ -309,7 +309,7 @@ public:
                 rep.content.insert(rep.content.end(), result.c_str(), result.c_str() + result.size());
             } catch (std::exception& e) {
                 BOOST_LOG_TRIVIAL(error) << "WebHandle(/api/set/buclnb): Can't set BUC LNB settings: " << e.what();
-                const std::string result = R"({"status":"error"})";
+                const std::string result = R"({"status": "error", "error": )" + api_driver::buildEscapedString(e.what()) + "}";
                 rep.content.insert(rep.content.end(), result.c_str(), result.c_str() + result.size());
             }
         }));
@@ -337,7 +337,7 @@ public:
                 rep.content.insert(rep.content.end(), result.c_str(), result.c_str() + result.size());
             } catch (std::exception& e) {
                 BOOST_LOG_TRIVIAL(error) << "WebHandle(/api/set/cinc): Can't set CinC settings: " << e.what();
-                const std::string result = R"({"status":"error"})";
+                const std::string result = R"({"status": "error", "error": )" + api_driver::buildEscapedString(e.what()) + "}";
                 rep.content.insert(rep.content.end(), result.c_str(), result.c_str() + result.size());
             }
         }));
@@ -365,7 +365,7 @@ public:
                 rep.content.insert(rep.content.end(), result.c_str(), result.c_str() + result.size());
             } catch (std::exception& e) {
                 BOOST_LOG_TRIVIAL(error) << "WebHandle(/api/set/rxtx): Can't set RX/TX settings: " << e.what();
-                const std::string result = R"({"status":"error"})";
+                const std::string result = R"({"status": "error", "error": )" + api_driver::buildEscapedString(e.what()) + "}";
                 rep.content.insert(rep.content.end(), result.c_str(), result.c_str() + result.size());
             }
         }));
@@ -393,7 +393,7 @@ public:
                 rep.content.insert(rep.content.end(), result.c_str(), result.c_str() + result.size());
             } catch (std::exception& e) {
                 BOOST_LOG_TRIVIAL(error) << "WebHandle(/api/set/network): Can't set network settings: " << e.what();
-                const std::string result = R"({"status":"error"})";
+                const std::string result = R"({"status": "error", "error": )" + api_driver::buildEscapedString(e.what()) + "}";
                 rep.content.insert(rep.content.end(), result.c_str(), result.c_str() + result.size());
             }
         }));
diff --git a/src/terminal_api_driver.cpp b/src/terminal_api_driver.cpp
index 05dafd1..ed657af 100644
--- a/src/terminal_api_driver.cpp
+++ b/src/terminal_api_driver.cpp
@@ -651,7 +651,7 @@ static const char* boolAsStr(bool value) {
     return value ? "true" : "false";
 }
 
-static std::string buildEscapedString(const std::string& source) {
+std::string api_driver::buildEscapedString(const std::string& source) {
     std::string str(source);
     size_t start_pos = 0;
     while((start_pos = str.find('\"', start_pos)) != std::string::npos) {
@@ -661,7 +661,7 @@ static std::string buildEscapedString(const std::string& source) {
     return "\"" + str + "\"";
 }
 
-void writeDouble(std::ostream& out, double value, int prec = 2) {
+static void writeDouble(std::ostream& out, double value, int prec = 2) {
     if (std::isnan(value) || std::isinf(value)) {
         out << "\"nan\"";
     } else {
@@ -873,7 +873,7 @@ std::string api_driver::ApiDriver::loadSettings() const {
     std::stringstream result;
     result << "{\n\"txAutoStart\":" << boolAsStr(modSettings.is_save_current_state);
 #ifdef MODEM_IS_SCPC
-    result << ",\"txEn\":" << boolAsStr(!modSettings.tx_is_on);
+    result << ",\"txEn\":" << boolAsStr(modSettings.tx_is_on);
     result << ",\"txModulatorIsTest\":" << boolAsStr(!modSettings.is_carrier);
 #endif
     result << ",\"txIsTestInput\":" << boolAsStr(modSettings.is_test_data);
diff --git a/src/terminal_api_driver.h b/src/terminal_api_driver.h
index 4685532..d4418c1 100644
--- a/src/terminal_api_driver.h
+++ b/src/terminal_api_driver.h
@@ -75,6 +75,13 @@ namespace api_driver {
     private:
         std::unique_ptr<TerminalApiDaemon> daemon;
     };
+
+    /**
+     * Функция для создания экранированной строки (для json)
+     * @param source исходная строка (например, {123"})
+     * @return {"123\""}
+     */
+    std::string buildEscapedString(const std::string& source);
 }
 
 #endif //TERMINAL_API_DRIVER_H
diff --git a/static/main-scpc.html b/static/main-scpc.html
index 36c13d0..d802238 100644
--- a/static/main-scpc.html
+++ b/static/main-scpc.html
@@ -774,7 +774,7 @@
 
                 this.submitStatus.rxtx = true
                 fetch('/api/set/rxtx', {method: 'POST', headers: {'Content-Type': 'application/json'}, body: JSON.stringify(query) })
-                    .then(async (resp) => { this.updateRxtxSettings(await resp.json()) })
+                    .then(async (resp) => { let vals = await resp.json(); if (vals['status'] !== 'ok') { throw new Error(vals['error'] ? vals['error'] : "Server returns undefined error") } this.updateRxtxSettings(vals) })
                     .catch((reason) => { alert(`Ошибка при применении настроек: ${reason}`) })
                     .finally(() => { this.submitStatus.rxtx = false })
             },
@@ -793,7 +793,7 @@
 
                 this.submitStatus.cinc = true
                 fetch('/api/set/cinc', {method: 'POST', headers: {'Content-Type': 'application/json'}, body: JSON.stringify(query) })
-                    .then(async (resp) => { this.updateCincSettings(await resp.json()) })
+                    .then(async (resp) => { let vals = await resp.json(); if (vals['status'] !== 'ok') { throw new Error(vals['error'] ? vals['error'] : "Server returns undefined error") } this.updateCincSettings(vals) })
                     .catch((reason) => { alert(`Ошибка при применении настроек: ${reason}`) })
                     .finally(() => { this.submitStatus.cinc = false })
             },
@@ -812,7 +812,7 @@
 
                 this.submitStatus.buclnb = true
                 fetch('/api/set/buclnb', {method: 'POST', headers: {'Content-Type': 'application/json'}, body: JSON.stringify(query) })
-                    .then(async (resp) => { this.updateBuclnbSettings(await resp.json()) })
+                    .then(async (resp) => { let vals = await resp.json(); if (vals['status'] !== 'ok') { throw new Error(vals['error'] ? vals['error'] : "Server returns undefined error") } this.updateBuclnbSettings(vals) })
                     .catch((reason) => { alert(`Ошибка при применении настроек: ${reason}`) })
                     .finally(() => { this.submitStatus.buclnb = false })
             },
@@ -826,7 +826,7 @@
 
                 this.submitStatus.tcpaccel = true
                 fetch('/api/set/tcpaccel', {method: 'POST', headers: {'Content-Type': 'application/json'}, body: JSON.stringify(query) })
-                    .then(async (resp) => { this.updateTcpaccelSettings(await resp.json()) })
+                    .then(async (resp) => { let vals = await resp.json(); if (vals['status'] !== 'ok') { throw new Error(vals['error'] ? vals['error'] : "Server returns undefined error") } this.updateTcpaccelSettings(vals) })
                     .catch((reason) => { alert(`Ошибка при применении настроек: ${reason}`) })
                     .finally(() => { this.submitStatus.tcpaccel = false })
             },
@@ -843,7 +843,7 @@
 
                 this.submitStatus.network = true
                 fetch('/api/set/network', {method: 'POST', headers: {'Content-Type': 'application/json'}, body: JSON.stringify(query) })
-                    .then(async (resp) => { this.updateNetworkSettings(await resp.json()) })
+                    .then(async (resp) => { let vals = await resp.json(); if (vals['status'] !== 'ok') { throw new Error(vals['error'] ? vals['error'] : "Server returns undefined error") } this.updateNetworkSettings(vals) })
                     .catch((reason) => { alert(`Ошибка при применении настроек: ${reason}`) })
                     .finally(() => { this.submitStatus.network = false })
             },
@@ -1077,6 +1077,7 @@
                     body: JSON.stringify(query)
                 }).then(async (resp) => {
                     this.submitStatusQos = false
+                    if (resp['error']) { throw new Error(resp['error']) }
                     this.updateQosSettings(await resp.json())
                 }).catch((reason) => {
                     this.submitStatusQos = false
diff --git a/static/main-tdma.html b/static/main-tdma.html
index 470bc45..00472be 100644
--- a/static/main-tdma.html
+++ b/static/main-tdma.html
@@ -436,7 +436,7 @@
 
                 this.submitStatus.rxtx = true
                 fetch('/api/set/rxtx', {method: 'POST', headers: {'Content-Type': 'application/json'}, body: JSON.stringify(query) })
-                    .then(async (resp) => { this.updateRxtxSettings(await resp.json()) })
+                    .then(async (resp) => { let vals = await resp.json(); if (vals['status'] !== 'ok') { throw new Error(vals['error'] ? vals['error'] : "Server returns undefined error") } this.updateRxtxSettings(vals) })
                     .catch((reason) => { alert(`Ошибка при применении настроек: ${reason}`) })
                     .finally(() => { this.submitStatus.rxtx = false })
             },
@@ -455,7 +455,7 @@
 
                 this.submitStatus.buclnb = true
                 fetch('/api/set/buclnb', {method: 'POST', headers: {'Content-Type': 'application/json'}, body: JSON.stringify(query) })
-                    .then(async (resp) => { this.updateBuclnbSettings(await resp.json()) })
+                    .then(async (resp) => { let vals = await resp.json(); if (vals['status'] !== 'ok') { throw new Error(vals['error'] ? vals['error'] : "Server returns undefined error") } this.updateBuclnbSettings(vals) })
                     .catch((reason) => { alert(`Ошибка при применении настроек: ${reason}`) })
                     .finally(() => { this.submitStatus.buclnb = false })
             },
@@ -472,7 +472,7 @@
 
                 this.submitStatus.network = true
                 fetch('/api/set/network', {method: 'POST', headers: {'Content-Type': 'application/json'}, body: JSON.stringify(query) })
-                    .then(async (resp) => { this.updateNetworkSettings(await resp.json()) })
+                    .then(async (resp) => { let vals = await resp.json(); if (vals['status'] !== 'ok') { throw new Error(vals['error'] ? vals['error'] : "Server returns undefined error") } this.updateNetworkSettings(vals) })
                     .catch((reason) => { alert(`Ошибка при применении настроек: ${reason}`) })
                     .finally(() => { this.submitStatus.network = false })
             },