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+====== SDK Script modbus-rtu-master.are ======
+<code c modbus-rtu-master.are>
+/* DESC: This script can be used to read messages from the serial port.
+ * Copyright (C) 2015 NetModule AG, Switzerland
+ */
+DEV = "SERIAL1";
+SLAVEID = 1;
+/* check serial port config */
+st = nb_config_get("serial.0.status");
+if (st != "2") {
+    nb_syslog("Serial port is not enabled for us");
+    exit(1);
+}
+/* set attributes */
+ret = nb_serial_setattr(DEV, 115200, 8, 1, 0, 0);
+if (ret != 0) {
+    printf("Could not set serial attributes: %i \n",ret);
+    exit(1);
+}
+/* open serial port */
+fd = nb_serial_open(DEV);
+if (fd < 0) {
+    printf("Unable to open %s\n", DEV);
+    exit(1);
+}
+/* register fd for modbus functions */
+if (nb_modbus_register(fd, MODBUS_TYPE_RTU) < 0) {
+    printf("Unable to register to modbus\n");
+    exit(1);
+}
+/* set slave id */
+if (nb_modbus_set_slave(fd, SLAVEID) < 0) {
+    printf("Unable to set slave identifier\n");
+    exit(1);
+}
+/* write 3 registers start at address 0*/
+data = mkarray(0, 1, 2);
+nb_modbus_write_regs(fd, 0, length(data), data);
+/* read 5 registers from address 0*/
+data = nb_modbus_read_regs(fd, 5, 5);
+/* print data */
+dump(data);
+/* unregister, close fd and exit */
+nb_modbus_unregister(fd);
+close(fd);
+exit(0);
+</code>