diff --git a/Makefile b/Makefile
index 6b3dfef..bd7d5a3 100644
--- a/Makefile
+++ b/Makefile
@@ -7,7 +7,7 @@ all: gclog
 
 gclog: $(OBJECTS)
 	$(CC) $(LDFLAGS) -o $@ $(OBJECTS)
-	which upx >/dev/null 2>&1 && upx -9 -qq $@ || true
+#	which upx >/dev/null 2>&1 && upx -9 -qq $@ || true
 
 %.o: %.c
 	$(CC) $(CFLAGS) -c $<
diff --git a/README b/README
index 698a6d4..7824811 100644
--- a/README
+++ b/README
@@ -1,7 +1,7 @@
    ___    Geiger Counter LOGger
-   \_/    Version 0.2.4
+   \_/    Version 0.2.5
 .--,O.--,
- \/   \/  Copyright (C) 2014-18 Steffen Lange, gclog@stelas.de
+ \/   \/  Copyright (C) 2014-19 Steffen Lange, gclog@stelas.de
 
 This program comes with ABSOLUTELY NO WARRANTY.
 This is free software, and you are welcome to redistribute it
diff --git a/README.Packaging b/README.Packaging
index 9334681..1ea8ea4 100644
--- a/README.Packaging
+++ b/README.Packaging
@@ -3,7 +3,7 @@ Packaging Geiger Counter Logger
 
 OpenWrt
 -------
-Recipe from: https://openwrt.org/docs/guide-developer/obtain.firmware.sdk
+Recipe from: https://openwrt.org/docs/guide-developer/using_the_sdk
 
 1. Download precompiled SDK (.tar.bz2 archive)
 2. Copy openwrt/Makefile to <SDK>/package/gclog/
diff --git a/diygeiger.c b/diygeiger.c
index c5f71c0..a9baa08 100644
--- a/diygeiger.c
+++ b/diygeiger.c
@@ -1,6 +1,6 @@
 #include "diygeiger.h"
 
-int diy_open(const char *device) {
+int diy_open(const char *device, speed_t baud) {
 	int fd = -1;
 	struct termios tio;
 
@@ -10,7 +10,7 @@ int diy_open(const char *device) {
 	tio.c_cc[VTIME] = 5;
 
 	if ((fd = open(device, O_RDWR)) != -1) {
-		if (cfsetspeed(&tio, B9600) == 0)		// 9600 baud
+		if (cfsetspeed(&tio, baud) == 0)		// usually 9600 baud
 			if (tcsetattr(fd, TCSANOW, &tio) == 0)
 				// Return file descriptor,
 				return fd;
diff --git a/diygeiger.h b/diygeiger.h
index 8aaf91e..d5d3d88 100644
--- a/diygeiger.h
+++ b/diygeiger.h
@@ -12,7 +12,7 @@
  Specification of GC10 Data I/O Interface: http://netiodev.com/GC10/GC10_UART_SPEC.pdf
 */
 
-int diy_open(const char *device);
+int diy_open(const char *device, speed_t baud);
 void diy_close(int device);
 int diy_get_cpm(int device);
 int diy_read(int device, char *buf, unsigned int len);
diff --git a/gclog.1 b/gclog.1
index 4b53485..28c8c55 100644
--- a/gclog.1
+++ b/gclog.1
@@ -1,4 +1,4 @@
-.TH GCLOG 1 "April 2018" "GCLOG 0.2" "Geiger Counter Logger"
+.TH GCLOG 1 "April 2019" "GCLOG 0.2" "Geiger Counter Logger"
 
 .SH NAME
 .B gclog
@@ -39,6 +39,12 @@ Serial device filename.
 
 Example: \fI/dev/ttyUSB0\fP
 
+.TP
+.B device.baudrate
+Serial port baud rate.
+
+Example: \fI57600\fP
+
 .TP
 .B location
 Name of your sensor location (required for Safecast).
diff --git a/gclog.c b/gclog.c
index b796d07..214df73 100644
--- a/gclog.c
+++ b/gclog.c
@@ -6,6 +6,7 @@
 #include <stdlib.h>
 #include <signal.h>
 #include <string.h>
+#include <termios.h>
 #include <time.h>
 #include <unistd.h>
 #include "logger.h"
@@ -60,19 +61,33 @@ void signal_handler(int sig) {
 	}
 }
 
-int geiger_open(enum EGeiger type, const char *device) {
+int baud_rate(int bps) {
+	switch (bps) {
+		case 1200: return B1200;
+		case 2400: return B2400;
+		case 4800: return B4800;
+		case 9600: return B9600;
+		case 19200: return B19200;
+		case 38400: return B38400;
+		case 57600: return B57600;
+		case 115200: return B115200;
+		default: return -1;	// Undefined baud rate
+	}
+}
+
+int geiger_open(enum EGeiger type, const char *device, speed_t baud) {
 	int fd = -1;
 	time_t t = time(NULL);
 	struct tm *tm = gmtime(&t);
 
 	if (type == GQ) {
-		if ((fd = gq_open(device)) != -1) {
+		if ((fd = gq_open(device, baud)) != -1) {
 			gq_set_date(fd, tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday);
 			gq_set_time(fd, tm->tm_hour,        tm->tm_min,     tm->tm_sec);
 		}
 	}
 	else if (type == DIY) {
-		fd = diy_open(device);
+		fd = diy_open(device, baud);
 	}
 	else if (type == SIM) {
 		fd = STDIN_FILENO;
@@ -193,6 +208,7 @@ int main(int argc, char *argv[]) {
 	unsigned int interval = 60;
 	enum EGeiger device_type = SIM;
 	char *device_port = NULL;
+	speed_t device_baudrate = B9600;
 	float latitude = 0.0, longitude = 0.0;
 	char *location = NULL;
 	char *netc_id = NULL;
@@ -250,6 +266,8 @@ int main(int argc, char *argv[]) {
 				}
 				if ((val = map_get(ini, "device.port")) != NULL)
 					device_port = string_copy(val);
+				if ((val = map_get(ini, "device.baudrate")) != NULL)
+					device_baudrate = baud_rate(atoi(val));
 				if ((val = map_get(ini, "latitude")) != NULL)
 					latitude = MIN(MAX(atof(val), -90.0), 90.0);
 				if ((val = map_get(ini, "longitude")) != NULL)
@@ -283,7 +301,7 @@ int main(int argc, char *argv[]) {
 
 	int fd = -1;
 
-	if (string_isset(device_port) && ((fd = geiger_open(device_type, device_port)) != -1)) {
+	if (string_isset(device_port) && ((fd = geiger_open(device_type, device_port, device_baudrate)) != -1)) {
 		fclose(stdin);
 		fclose(stdout);
 		fclose(stderr);
diff --git a/gclog.conf b/gclog.conf
index e30362b..6fb9e56 100644
--- a/gclog.conf
+++ b/gclog.conf
@@ -3,17 +3,26 @@
 ############################################
 
 # Geiger counter type:
+######################
 #  'gq'  -> GQ GMC Geiger Counter (GQ-RFC1201 protocol)
 #  'diy' -> DIY/MyGeiger/NET-IO Geiger Kit or compatible
 ########################################################
 #device.type=diy
-#device.type=gq
-device.type=sim
+device.type=gq
 
 # Serial device filename
 ########################
 device.port=/dev/ttyUSB0
 
+# Serial port baud rate:
+########################
+#  DIY Geiger counter       ->   9600 bps
+#  GMC-300 V3 and older     ->  57600 bps
+#  GMC-300 Plus V4, GMC-320 -> 115200 bps
+#########################################
+#device.baudrate=9600
+device.baudrate=57600
+
 # GPS location of your sensor; required for Safecast
 ####################################################
 location=Berlin, DE
diff --git a/gqgeiger.c b/gqgeiger.c
index b19ac35..b875094 100644
--- a/gqgeiger.c
+++ b/gqgeiger.c
@@ -1,6 +1,6 @@
 #include "gqgeiger.h"
 
-int gq_open(const char *device) {
+int gq_open(const char *device, speed_t baud) {
 	int fd = -1;
 	struct termios tio;
 
@@ -10,7 +10,7 @@ int gq_open(const char *device) {
 	tio.c_cc[VTIME] = 5;
 
 	if ((fd = open(device, O_RDWR)) != -1) {
-		if (cfsetspeed(&tio, B57600) == 0)		// 57600 baud
+		if (cfsetspeed(&tio, baud) == 0)		// usually 57600 or 115200 baud
 			if (tcsetattr(fd, TCSANOW, &tio) == 0)
 				// Turn off heartbeat,
 				if (gq_set_heartbeat_off(fd))
@@ -35,7 +35,8 @@ int gq_get_cpm(int device) {
 	if (gq_write(device, cmd) == (ssize_t) strlen(cmd))
 		gq_read(device, buf, 2);
 
-	return buf[0] * 256 + buf[1];
+	// Mask out upper 2 bits as mentioned in GQ-RFC1201.
+	return (buf[0] & 0x3f) * 256 + buf[1];
 }
 
 bool gq_set_heartbeat_off(int device) {
diff --git a/gqgeiger.h b/gqgeiger.h
index 7e5b35a..03562ab 100644
--- a/gqgeiger.h
+++ b/gqgeiger.h
@@ -12,7 +12,7 @@
  GQ Geiger Counter Communication Protocol: http://www.gqelectronicsllc.com/download/GQ-RFC1201.txt
 */
 
-int gq_open(const char *device);
+int gq_open(const char *device, speed_t baud);
 void gq_close(int device);
 int gq_get_cpm(int device);
 bool gq_set_heartbeat_off(int device);