diff --git a/slsDetectorServers/CMakeLists.txt b/slsDetectorServers/CMakeLists.txt
index f185b732a..44abc709d 100644
--- a/slsDetectorServers/CMakeLists.txt
+++ b/slsDetectorServers/CMakeLists.txt
@@ -19,10 +19,10 @@ install(TARGETS slsProjectCWarnings
     ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
     PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
 )
-add_subdirectory(ctbDetectorServer)
-add_subdirectory(eigerDetectorServer)
-add_subdirectory(gotthardDetectorServer)
-add_subdirectory(jungfrauDetectorServer)
+#add_subdirectory(ctbDetectorServer)
+#add_subdirectory(eigerDetectorServer)
+#add_subdirectory(gotthardDetectorServer)
+#add_subdirectory(jungfrauDetectorServer)
 add_subdirectory(mythen3DetectorServer)
-add_subdirectory(gotthard2DetectorServer)
-add_subdirectory(moenchDetectorServer)
+#add_subdirectory(gotthard2DetectorServer)
+#add_subdirectory(moenchDetectorServer)
diff --git a/slsDetectorServers/mythen3DetectorServer/CMakeLists.txt b/slsDetectorServers/mythen3DetectorServer/CMakeLists.txt
index f6a4c841c..cf4269bed 100644
--- a/slsDetectorServers/mythen3DetectorServer/CMakeLists.txt
+++ b/slsDetectorServers/mythen3DetectorServer/CMakeLists.txt
@@ -10,6 +10,7 @@ add_executable(mythen3DetectorServer_virtual
     ../slsDetectorServer/src/LTC2620_Driver.c
     ../slsDetectorServer/src/ALTERA_PLL_CYCLONE10.c   
     ../slsDetectorServer/src/programFpgaNios.c
+    ../slsDetectorServer/src/clogger.c
 )
 
 include_directories(
diff --git a/slsDetectorServers/mythen3DetectorServer/slsDetectorFunctionList.c b/slsDetectorServers/mythen3DetectorServer/slsDetectorFunctionList.c
index 88f7db52d..8c4a3b68d 100644
--- a/slsDetectorServers/mythen3DetectorServer/slsDetectorFunctionList.c
+++ b/slsDetectorServers/mythen3DetectorServer/slsDetectorFunctionList.c
@@ -24,6 +24,7 @@ extern udpStruct udpDetails;
 extern const enum detectorType myDetectorType;
 
 // Global variable from communication_funcs.c
+extern int isControlServer;
 extern void getMacAddressinString(char* cmac, int size, uint64_t mac);
 extern void getIpAddressinString(char* cip, uint32_t ip);
 
@@ -32,6 +33,7 @@ int initCheckDone = 0;
 char initErrorMessage[MAX_STR_LENGTH];
 
 #ifdef VIRTUAL
+//int pipeFDs[2];
 pthread_t pthread_virtual_tid;
 int virtual_status = 0;
 int virtual_stop = 0;
@@ -1351,10 +1353,16 @@ int startStateMachine(){
 	LOG(logINFOBLUE, ("Starting State Machine\n"));
 	// set status to running
 	virtual_status = 1;
+	/*if (isControlServer) {
+		//write(pipeFDs[PIPE_WRITE], &virtual_status, sizeof(virtual_status));
+	}*/
 	virtual_stop = 0;
 	if(pthread_create(&pthread_virtual_tid, NULL, &start_timer, NULL)) {
 		LOG(logERROR, ("Could not start Virtual acquisition thread\n"));
 		virtual_status = 0;
+		/*if (isControlServer) {
+			//write(pipeFDs[PIPE_WRITE], &virtual_status, sizeof(virtual_status));
+		}*/		
 		return FAIL;
 	}
 	LOG(logINFOGREEN, ("Virtual Acquisition started\n"));
@@ -1455,6 +1463,9 @@ void* start_timer(void* arg) {
 	closeUDPSocket(0);
 
 	virtual_status = 0;
+	/*if (isControlServer) {
+		//write(pipeFDs[PIPE_WRITE], &virtual_status, sizeof(virtual_status));
+	}	*/
 	LOG(logINFOBLUE, ("Finished Acquiring\n"));
 	return NULL;
 }
@@ -1475,6 +1486,13 @@ int stopStateMachine(){
 
 enum runStatus getRunStatus(){
 #ifdef VIRTUAL
+	/*if (!isControlServer) {
+		LOG(logINFORED, ("***** reading\n"));
+		while (read(pipeFDs[PIPE_READ], &virtual_status, sizeof(virtual_status)) > 0) {
+			LOG(logINFORED, ("virtual status:%d\n", virtual_status));
+		}
+		LOG(logINFORED, ("***** final %d\n", virtual_status));
+	}*/
 	if(virtual_status == 0){
 		LOG(logINFOBLUE, ("Status: IDLE\n"));
 		return IDLE;
@@ -1550,6 +1568,12 @@ void readFrame(int *ret, char *mess) {
 
 u_int32_t runBusy() {
 #ifdef VIRTUAL
+	/*if (!isControlServer) {
+		LOG(logINFORED, ("runbusy \n"));
+		while (read(pipeFDs[PIPE_READ], &virtual_status, sizeof(virtual_status)) > 0) {
+			LOG(logINFORED, ("runbusy virtual status:%d\n", virtual_status));
+		}
+	}*/
     return virtual_status;
 #endif
 	u_int32_t s = (bus_r(PAT_STATUS_REG) & PAT_STATUS_RUN_BUSY_MSK);
diff --git a/slsDetectorServers/mythen3DetectorServer/slsDetectorServer_defs.h b/slsDetectorServers/mythen3DetectorServer/slsDetectorServer_defs.h
index 0486b21af..c41d0ef1d 100644
--- a/slsDetectorServers/mythen3DetectorServer/slsDetectorServer_defs.h
+++ b/slsDetectorServers/mythen3DetectorServer/slsDetectorServer_defs.h
@@ -5,6 +5,9 @@
 
 #define CTRL_SRVR_INIT_TIME_US      (300 * 1000)
 
+#define PIPE_WRITE 1
+#define PIPE_READ 0
+
 /* Hardware Definitions */
 #define NCOUNTERS					(3)
 #define MAX_COUNTER_MSK				(0x7)
diff --git a/slsDetectorServers/slsDetectorServer/src/slsDetectorServer.c b/slsDetectorServers/slsDetectorServer/src/slsDetectorServer.c
index 301b0e51b..d7b163324 100755
--- a/slsDetectorServers/slsDetectorServer/src/slsDetectorServer.c
+++ b/slsDetectorServers/slsDetectorServer/src/slsDetectorServer.c
@@ -11,6 +11,7 @@
 #include <signal.h>
 #include <string.h>
 #include <unistd.h>
+#include <fcntl.h>
 
 // Global variables from  communication_funcs
 extern int isControlServer;
@@ -23,6 +24,9 @@ extern int checkModuleFlag;
 
 
 // Global variables from slsDetectorFunctionList
+#ifdef VIRTUAL
+//extern int pipeFDs[2];
+#endif
 #ifdef GOTTHARDD
 extern int phaseShift;
 #endif
@@ -31,7 +35,8 @@ void error(char *msg){
 	perror(msg);
 }
 
-int main(int argc, char *argv[]){
+int main(int argc, char *argv[]) {
+
 	// print version
 	if (argc > 1 && !strcasecmp(argv[1], "-version")) {
         int version = 0;
@@ -61,11 +66,7 @@ int main(int argc, char *argv[]){
 	{
 		int i;
 		for (i = 1; i < argc; ++i) {
-			if(!strcasecmp(argv[i],"-stopserver")) {
-				LOG(logINFO, ("Detected stop server\n"));
-				isControlServer = 0;
-			}
-            else if(!strcasecmp(argv[i],"-devel")){
+            if(!strcasecmp(argv[i],"-devel")){
                 LOG(logINFO, ("Detected developer mode\n"));
                 debugflag = 1;
             }
@@ -82,7 +83,7 @@ int main(int argc, char *argv[]){
 			        LOG(logERROR, ("cannot decode port value %s. Exiting.\n", argv[i + 1]));
 			        return -1;
 			    }
-				LOG(logINFO, ("Detected port: %d\n", portno));
+				LOG(logINFO, ("Detected control port: %d\n", portno));
             }
 #ifdef GOTTHARDD
 			else if(!strcasecmp(argv[i],"-phaseshift")){
@@ -100,33 +101,53 @@ int main(int argc, char *argv[]){
 		}
 	}
 
+
+	// stop server
 #ifdef STOP_SERVER
-	char cmd[MAX_STR_LENGTH];
-	memset(cmd, 0, MAX_STR_LENGTH);
+
+	// create pipes to communicate with stop server
+#ifdef VIRTUAL
+	/*if (pipe(pipeFDs) < 0) {
+		LOG(logERROR, ("Could not create pipes to communicate with stop server\n"));
+		return -1;
+	}*/
 #endif
-	if (isControlServer) {
-		LOG(logINFO, ("Opening control server on port %d \n", portno));
-#ifdef STOP_SERVER
-		{
-			int i;
-			for (i = 0; i < argc; ++i) {
-				if (i > 0) {
-					strcat(cmd, " ");
-				}
-				strcat(cmd, argv[i]);
-			}
-			char temp[50];
-			memset(temp, 0, sizeof(temp));
-			sprintf(temp, " -stopserver -port %d &", portno + 1);
-			strcat(cmd, temp);
-			
-			LOG(logDEBUG1, ("Command to start stop server:%s\n", cmd));
-			system(cmd);
-		}
+
+	// fork stop server
+	pid_t cpid = fork(); 
+	if (cpid < 0) {
+		LOG(logERROR, ("Could not create fork a stop server\n"));
+		return -1;
+	}
+		//fcntl(pipeFDs[PIPE_READ], F_SETFL, O_NONBLOCK);
+		//fcntl(pipeFDs[PIPE_WRITE], F_SETFL, O_NONBLOCK);
+
+	// stop server (child process)
+	if (cpid == 0) {
+		isControlServer = 0;
+		++portno;
+		LOG(logINFOBLUE, ("Stop server [%d]\n", portno));
+		// change name of stop server to distinguish
+		char stopServerSuffix[30];
+		memset(stopServerSuffix, 0, sizeof(stopServerSuffix));
+		sprintf(stopServerSuffix, " Stop_Server %d", portno);
+		//strcat(argv[0], stopServerSuffix);
+#ifdef VIRTUAL
+		//close(pipeFDs[PIPE_WRITE]);
+		//fcntl(pipeFDs[PIPE_READ], F_SETFL, O_NONBLOCK);
 #endif
 	} else {
-		LOG(logINFO,("Opening stop server on port %d \n", portno));
+		isControlServer = 1;
+		LOG(logINFOBLUE, ("Control server [%d]\n", portno));
+#ifdef VIRTUAL
+		//close(pipeFDs[PIPE_READ]);
+#endif
 	}
+#endif
+
+
+
+
 
 	init_detector();
 
@@ -142,7 +163,7 @@ int main(int argc, char *argv[]){
 	if (isControlServer) {
 		LOG(logINFOBLUE, ("Control Server Ready...\n\n"));
 	} else {
-		LOG(logINFO, ("Stop Server Ready...\n\n"));
+		LOG(logINFOBLUE, ("Stop Server Ready...\n\n"));
 	}
 
 	// waits for connection
diff --git a/slsDetectorSoftware/tests/test-CmdProxy-global.cpp b/slsDetectorSoftware/tests/test-CmdProxy-global.cpp
index 7ff52aef9..b8de30eea 100644
--- a/slsDetectorSoftware/tests/test-CmdProxy-global.cpp
+++ b/slsDetectorSoftware/tests/test-CmdProxy-global.cpp
@@ -49,7 +49,6 @@ void test_onchip_dac(defs::dacIndex index, const std::string &dacname, int dacva
     auto dacValueStr = sls::ToStringHex(dacvalue);
     auto chipIndexStr = std::to_string(chipIndex);
     std::ostringstream oss_set, oss_get;
-    std::cout << "chipindexstr:"<<chipIndexStr<<" dacvaluestr:"<<dacValueStr<<std::endl;
     proxy.Call(dacname, {chipIndexStr, dacValueStr}, -1, PUT, oss_set);
     REQUIRE(oss_set.str() == dacname + " " + chipIndexStr + " " + dacValueStr + "\n");
     proxy.Call(dacname, {chipIndexStr}, -1, GET, oss_get);
diff --git a/slsDetectorSoftware/tests/test-CmdProxy.cpp b/slsDetectorSoftware/tests/test-CmdProxy.cpp
index 1ddf65ecd..c74922719 100644
--- a/slsDetectorSoftware/tests/test-CmdProxy.cpp
+++ b/slsDetectorSoftware/tests/test-CmdProxy.cpp
@@ -852,9 +852,88 @@ TEST_CASE("temp_fpga", "[.cmd][.new]") {
     }
 }
 
+/* acquisition */
 
+TEST_CASE("clearbusy", "[.cmd][.new]") {
+    Detector det;
+    CmdProxy proxy(&det);
+    REQUIRE_NOTHROW(proxy.Call("clearbusy", {}, -1, PUT));
+    REQUIRE_THROWS(proxy.Call("clearbusy", {"0"}, -1, PUT));
+    REQUIRE_THROWS(proxy.Call("clearbusy", {}, -1, GET));
+}
 
+TEST_CASE("start", "[.cmd][.rx][.new]") {
+    Detector det;
+    CmdProxy proxy(&det);
+    // PUT only command
+    REQUIRE_THROWS(proxy.Call("start", {}, -1, GET));
+    auto prev_val = det.getExptime();
+    det.setExptime(std::chrono::seconds(10));
+    {
+        std::ostringstream oss;
+        proxy.Call("start", {}, -1, PUT, oss);
+        REQUIRE(oss.str() == "start successful\n");
+    }
+    {
+        std::ostringstream oss;
+        proxy.Call("status", {}, -1, GET, oss);
+        REQUIRE(oss.str() == "status running\n");
+    }
+    det.stopDetector();
+    for (int i = 0; i != det.size(); ++i) {
+        det.setExptime(prev_val[i], {i});
+    }
+}
 
+TEST_CASE("stop", "[.cmd][.rx][.new]") {
+    Detector det;
+    CmdProxy proxy(&det);
+    // PUT only command
+    REQUIRE_THROWS(proxy.Call("stop", {}, -1, GET));
+    auto prev_val = det.getExptime();
+    det.setExptime(std::chrono::seconds(10));
+    det.startDetector();
+    {
+        std::ostringstream oss;
+        proxy.Call("status", {}, -1, GET, oss);
+        REQUIRE(oss.str() == "status running\n");
+    }
+    {
+        std::ostringstream oss;
+        proxy.Call("stop", {}, -1, PUT, oss);
+        REQUIRE(oss.str() == "stop successful\n");
+    }
+    {
+        std::ostringstream oss;
+        proxy.Call("status", {}, -1, GET, oss);
+        REQUIRE(oss.str() == "status idle\n");
+    }
+    for (int i = 0; i != det.size(); ++i) {
+        det.setExptime(prev_val[i], {i});
+    }
+}
+
+TEST_CASE("status", "[.cmd][.rx][.new]") {
+    Detector det;
+    CmdProxy proxy(&det);
+    auto prev_val = det.getExptime();
+    det.setExptime(std::chrono::seconds(10));
+    det.startReceiver();
+    {
+        std::ostringstream oss;
+        proxy.Call("status", {}, -1, GET, oss);
+        REQUIRE(oss.str() == "status running\n");
+    }
+    det.stopReceiver();
+    {
+        std::ostringstream oss;
+        proxy.Call("status", {}, -1, GET, oss);
+        REQUIRE(oss.str() == "status idle\n");
+    }
+    for (int i = 0; i != det.size(); ++i) {
+        det.setExptime(prev_val[i], {i});
+    } 
+}