diff --git a/F1-nolib/DS18/DS18.bin b/F1-nolib/DS18/DS18.bin
index 1609d46..0430dfd 100755
Binary files a/F1-nolib/DS18/DS18.bin and b/F1-nolib/DS18/DS18.bin differ
diff --git a/F1-nolib/DS18/ds18.c b/F1-nolib/DS18/ds18.c
index a4ff4ad..05d6642 100644
--- a/F1-nolib/DS18/ds18.c
+++ b/F1-nolib/DS18/ds18.c
@@ -18,12 +18,15 @@
 
 #include "ds18.h"
 #include "proto.h"
-
+#include "usb.h"
 
 //#define EBUG
+// ID1: 0x28 0xba 0xc7 0xea 0x05 0x00 0x00 0xc2
+// ID2: 0x28 0x68 0xc9 0xe9 0x05 0x00 0x00 0x42
+// ID3: 0x28 0x23 0xef 0xe9 0x05 0x00 0x00 0xab
+
 
 #ifdef EBUG
-#include "usb.h"
 #define DBG(x)  do{USB_send(x);}while(0)
 #else
 #define DBG(x)
@@ -99,8 +102,8 @@
  * 8 - CRC
  */
 
-// max amount of bits (1bytes x 8bits)
-#define NmeasurementMax     (88)
+// max amount of bits (20bytes x 8bits)
+#define NmeasurementMax     (160)
 // reset pulse length (ms+1..2)
 #define DS18_RESETPULSE_LEN (3)
 // max length of measurement (ms+1..2)
@@ -108,6 +111,8 @@
 // maximal received data bytes
 #define IMAXCTR             (10)
 
+static uint8_t DS18ID[8] = {0}, matchID = 0;
+
 static void (*ow_process_resdata)() = NULL; // what to do with received data
 
 static DS18_state dsstate = DS18_SLEEP;
@@ -122,6 +127,25 @@ static uint8_t receivectr = 0; // data bytes amount to receive
 // prepare buffers to sending
 #define OW_reset_buffer()   do{cc1buff_ctr = 0; receivectr = 0; totbytesctr = 0;}while(0)
 
+// several devices on line
+void DS18_setID(const uint8_t ID[8]){
+    uint32_t *O = (uint32_t*)DS18ID, *I = (uint32_t*)ID;
+    *O++ = *I++; *O = *I;
+    matchID = 1;
+#ifdef EBUG
+    USB_send("DS18_setID: ");
+    for(int i = 0; i < 8; ++i){
+        USB_send(" 0x");
+        printhex(DS18ID[i]);
+    }
+    USB_send("\n");
+#endif
+}
+// the only device on line
+void DS18_clearID(){
+    matchID = 0;
+}
+
 /**
  * add next data byte
  * @param ow_byte - byte to convert
@@ -224,6 +248,22 @@ static void DS18_getReg(int n){
     printsp(r, n);
 }
 
+static int chkCRC(const uint8_t data[9]){
+    uint8_t crc = 0;
+    for(int n = 0; n < 8; ++n){
+        crc = crc ^ data[n];
+           for(int i = 0; i < 8; i++){
+               if(crc & 1)
+                   crc = (crc >> 1) ^ 0x8C;
+               else
+                   crc >>= 1;
+           }
+    }
+    //USB_send("got crc: "); printhex(crc); USB_send("\n");
+    if(data[8] == crc) return 0;
+    return 1;
+}
+
 // data processing functions
 static void DS18_gettemp(){ // calculate T
     dsstate = DS18_SLEEP;
@@ -238,6 +278,18 @@ static void DS18_gettemp(){ // calculate T
         dsstate = DS18_ERROR;
         return;
     }
+    int ctr;
+    for(ctr = 0; ctr < 9; ++ctr){
+        if(r[ctr] != 0xff) break;
+    }
+    if(ctr == 9){
+        USB_send("Target ID not found");
+        return;
+    }
+    if(chkCRC(r)){
+        USB_send("CRC is wrong\n");
+        return;
+    }
     uint16_t l = r[0], m = r[1], v;
     int32_t t;
     if(r[4] == 0xff){ // DS18S20
@@ -256,7 +308,13 @@ static void DS18_pollt(){ // poll T
     if((r = OW_readbuf()) && receivectr == 1){
         if(*r == CONVERSION_DONE){
             OW_reset_buffer();
-            OW_add_byte(OW_SKIP_ROM);
+            if(matchID){ // add MATCH command & target ID
+                OW_add_byte(OW_MATCH_ROM);
+                for(int i = 0; i < 8; ++i)
+                    OW_add_byte(DS18ID[i]);
+            }else{
+                OW_add_byte(OW_SKIP_ROM);
+            }
             OW_add_byte(OW_READ_SCRATCHPAD);
             OW_add_read_seq(9);
             ow_process_resdata = DS18_gettemp;
diff --git a/F1-nolib/DS18/ds18.h b/F1-nolib/DS18/ds18.h
index 7ab140e..56e1403 100644
--- a/F1-nolib/DS18/ds18.h
+++ b/F1-nolib/DS18/ds18.h
@@ -42,5 +42,8 @@ void DS18_process(uint32_t Tms);
 int DS18_readScratchpad();
 void DS18_poll();
 
+void DS18_clearID();
+void DS18_setID(const uint8_t ID[8]);
+
 #endif // DHT_H__
 
diff --git a/F1-nolib/DS18/proto.c b/F1-nolib/DS18/proto.c
index d66614b..5ee884f 100644
--- a/F1-nolib/DS18/proto.c
+++ b/F1-nolib/DS18/proto.c
@@ -22,67 +22,237 @@
 
 extern volatile uint32_t Tms;
 
+
+char *omit_spaces(const char *buf){
+    while(*buf){
+        if(*buf > ' ') break;
+        ++buf;
+    }
+    return (char*)buf;
+}
+
+// In case of overflow return `buf` and N==0xffffffff
+// read decimal number & return pointer to next non-number symbol
+static char *getdec(const char *buf, uint32_t *N){
+    char *start = (char*)buf;
+    uint32_t num = 0;
+    while(*buf){
+        char c = *buf;
+        if(c < '0' || c > '9'){
+            break;
+        }
+        if(num > 429496729 || (num == 429496729 && c > '5')){ // overflow
+            *N = 0xffffff;
+            return start;
+        }
+        num *= 10;
+        num += c - '0';
+        ++buf;
+    }
+    *N = num;
+    return (char*)buf;
+}
+// read hexadecimal number (without 0x prefix!)
+static char *gethex(const char *buf, uint32_t *N){
+    char *start = (char*)buf;
+    uint32_t num = 0;
+    while(*buf){
+        char c = *buf;
+        uint8_t M = 0;
+        if(c >= '0' && c <= '9'){
+            M = '0';
+        }else if(c >= 'A' && c <= 'F'){
+            M = 'A' - 10;
+        }else if(c >= 'a' && c <= 'f'){
+            M = 'a' - 10;
+        }
+        if(M){
+            if(num & 0xf0000000){ // overflow
+                *N = 0xffffff;
+                return start;
+            }
+            num <<= 4;
+            num += c - M;
+        }else{
+            break;
+        }
+        ++buf;
+    }
+    *N = num;
+    return (char*)buf;
+}
+// read octal number (without 0 prefix!)
+static char *getoct(const char *buf, uint32_t *N){
+    char *start = (char*)buf;
+    uint32_t num = 0;
+    while(*buf){
+        char c = *buf;
+        if(c < '0' || c > '7'){
+            break;
+        }
+        if(num & 0xe0000000){ // overflow
+            *N = 0xffffff;
+            return start;
+        }
+        num <<= 3;
+        num += c - '0';
+        ++buf;
+    }
+    *N = num;
+    return (char*)buf;
+}
+// read binary number (without b prefix!)
+static char *getbin(const char *buf, uint32_t *N){
+    char *start = (char*)buf;
+    uint32_t num = 0;
+    while(*buf){
+        char c = *buf;
+        if(c < '0' || c > '1'){
+            break;
+        }
+        if(num & 0x80000000){ // overflow
+            *N = 0xffffff;
+            return start;
+        }
+        num <<= 1;
+        if(c == '1') num |= 1;
+        ++buf;
+    }
+    *N = num;
+    return (char*)buf;
+}
+
+/**
+ * @brief getnum - read uint32_t from string (dec, hex or bin: 127, 0x7f, 0b1111111)
+ * @param buf - buffer with number and so on
+ * @param N   - the number read
+ * @return pointer to first non-number symbol in buf
+ *      (if it is == buf, there's no number or if *N==0xffffffff there was overflow)
+ */
+char *getnum(const char *txt, uint32_t *N){
+    char *nxt = NULL;
+    char *s = omit_spaces(txt);
+    if(*s == '0'){ // hex, oct or 0
+        if(s[1] == 'x' || s[1] == 'X'){ // hex
+            nxt = gethex(s+2, N);
+            if(nxt == s+2) nxt = (char*)txt;
+        }else if(s[1] > '0'-1 && s[1] < '8'){ // oct
+            nxt = getoct(s+1, N);
+            if(nxt == s+1) nxt = (char*)txt;
+        }else{ // 0
+            nxt = s+1;
+            *N = 0;
+        }
+    }else if(*s == 'b' || *s == 'B'){
+        nxt = getbin(s+1, N);
+        if(nxt == s+1) nxt = (char*)txt;
+    }else{
+        nxt = getdec(s, N);
+        if(nxt == s) nxt = (char*)txt;
+    }
+    return nxt;
+}
+
 static const char *helpmesg =
+        "'C' - clear match ROM\n"
+        "'D' - get DS18 state\n"
         "'I' - get DS18 ID\n"
         "'M' - start measurement\n"
         "'P' - read scratchpad\n"
-        "'S' - get DHT state\n"
+        "'S' - set match ROM (S 0xaa 0xbb... - 8 bytes of ID)\n"
         "'R' - software reset\n"
         "'T' - get time from start\n"
         "'W' - test watchdog\n"
 ;
 
+// read 8 bytes of ROM and run SETROM
+static void setROM(const char *buf){
+    uint8_t ID[8];
+    uint32_t N;
+    for(int i = 0; i < 8; ++i){
+        char *nxt = getnum(buf, &N);
+        if(nxt == buf || N > 0xff){
+            USB_send("Wrong data: ");
+            USB_send(buf);
+            return;
+        }
+        ID[i] = (uint8_t) N;
+        buf = nxt;
+    }
+    DS18_setID(ID);
+    USB_send("Set ID to:");
+    for(int i = 0; i < 8; ++i){
+        USB_send(" 0x");
+        printhex(ID[i]);
+    }
+    USB_send("\n");
+}
+
 const char *parse_cmd(const char *buf){
-    if(buf[1] != '\n') return buf;
-    switch(*buf){
-        case 'I':
-            if(DS18_readID()) return "Reading ID..\n";
-            else return "Error\n";
-        case 'M':
-            if(DS18_start()) return "Started\n";
-            else return "Wait a little\n";
-        break;
-/*        case 'p':
-            DS18_poll();
-            return "polling\n";
-        break;*/
-        case 'P':
-            if(DS18_readScratchpad()) return "Reading scr..\n";
-            else return "Error\n";
-        break;
-        case 'R':
-            USB_send("Soft reset\n");
-            NVIC_SystemReset();
-        break;
-        case 'S':
-            switch(DS18_getstate()){
-                case DS18_SLEEP:
-                    return "Sleeping\n";
-                case DS18_RESETTING:
-                    return "Resetting\n";
-                case DS18_DETECTING:
-                    return "Detecting\n";
-                case DS18_DETDONE:
-                    return "Detection done\n";
-                case DS18_READING:
-                    return "Measuring\n";
-                case DS18_GOTANSWER:
-                    return "Results are ready\n";
-                default:
-                    return "Not found\n";
-            }
-        case 'T':
-            USB_send("T=");
-            USB_send(u2str(Tms));
-            USB_send("ms\n");
-        break;
-        case 'W':
-            USB_send("Wait for reboot\n");
-            while(1){nop();};
-        break;
-        default: // help
-            return helpmesg;
-        break;
+    if(buf[1] == '\n'){
+        switch(*buf){
+            case 'C':
+                DS18_clearID();
+                return "Don't send MATCH ROM\n";
+            break;
+            case 'D':
+                switch(DS18_getstate()){
+                    case DS18_SLEEP:
+                        return "Sleeping\n";
+                    case DS18_RESETTING:
+                        return "Resetting\n";
+                    case DS18_DETECTING:
+                        return "Detecting\n";
+                    case DS18_DETDONE:
+                        return "Detection done\n";
+                    case DS18_READING:
+                        return "Measuring\n";
+                    case DS18_GOTANSWER:
+                        return "Results are ready\n";
+                    default:
+                        return "Not found\n";
+                }
+            break;
+            case 'I':
+                if(DS18_readID()) return "Reading ID..\n";
+                else return "Error\n";
+            case 'M':
+                if(DS18_start()) return "Started\n";
+                else return "Wait a little\n";
+            break;
+    /*        case 'p':
+                DS18_poll();
+                return "polling\n";
+            break;*/
+            case 'P':
+                if(DS18_readScratchpad()) return "Reading scr..\n";
+                else return "Error\n";
+            break;
+            case 'R':
+                USB_send("Soft reset\n");
+                NVIC_SystemReset();
+            break;
+            case 'T':
+                USB_send("T=");
+                USB_send(u2str(Tms));
+                USB_send("ms\n");
+            break;
+            case 'W':
+                USB_send("Wait for reboot\n");
+                while(1){nop();};
+            break;
+            default: // help
+                return helpmesg;
+            break;
+        }
+    }else{ // several letters
+        switch(*buf){
+            case 'S':
+                setROM(buf + 1);
+            break;
+            default:
+                return buf;
+        }
     }
     return NULL;
 }