Freeduino + URM04 + IO Expansion Shield For Arduino(V5) - not working

Hello. Sorry for bad English (I know its bad)

I have a question (I'm a novice) how to connect "URM04 V2.0 Ultrasonic sensor" to the board Freeduino. I connect, and then run the sketch of an example and nothing works.
Describe step by step the actions.
1. 1. connect to the board Freeduino (Duemilanove) shield "[url=http://www.dfrobot.com/index.php?route=product/product&filter_name=IO%20Expansion%20Shield&page=5&product_id=264]IO Expansion Shield For Arduino (V5)[/url]"
2. set jumpers to rs485.
3. connect "[url=http://www.dfrobot.com/index.php?route=product/product&filter_name=URM04%20V2.0%20Ultrasonic%20sensor&product_id=101]URM04 V2.0 Ultrasonic sensor[/url]"
4. set the sketch and watch the process through the "Serial Monitor" program Arduino. Sketch loaded from Manual and my sketch(at the end of message), who tries to start measuring and then read distance.

at that time:
- When connecting URM04 blinks 4 times the LED (this is good)
- In the "Serial Monitor" I see that URM04 not responding to commands.

a feeling that there is no data transfer over RS485. How can I test the port?


my sketch for testing:
[code]
#include <Metro.h>

Metro TriggerMetro = Metro(2000,true);
Metro distanceMetro = Metro(200);


int EN = 2;

byte cmd[7];
byte address = 0x12;
boolean start = true;

void setup()
{
pinMode(EN, OUTPUT);
Serial.begin(19200);
}

void loop()
{
if(TriggerMetro.check()==1)
{
if(start){// send a command to a different address
start=false;
digitalWrite(EN, HIGH);
for(int j= 0x11;j<0x18;j++){
address=j;
trigger();
}
digitalWrite(EN, LOW);
}
}
if((distanceMetro.check()==1) && (!start))
{
digitalWrite(EN, HIGH);
for(int j= 0x11;j<0x18;j++){
address=j;
getDistance();
}

digitalWrite(EN, LOW);
}

if (Serial.available()){
digitalWrite(EN, LOW);
Serial.println(Serial.read());
}
}


void trigger()// begin scan
{
cmd[0]= 0x55;
cmd[1]= 0xaa;
cmd[2]= address;
cmd[3]= 0x00;
cmd[4]= 0x01;
cmd[5]= cmd[0]+cmd[1]+cmd[2]+cmd[3]+cmd[4];
for(int j=0;j<6;j++){
Serial.print(cmd[j]);
}

}


void getDistance()//
{
cmd[0]= 0x55;
cmd[1]= 0xaa;
cmd[2]= address;
cmd[3]= 0x00;
cmd[4]= 0x02;
cmd[5]= cmd[0]+cmd[1]+cmd[2]+cmd[3]+cmd[4];
for(int j=0;j<6;j++){
Serial.print(cmd[j]);
}

}
[/code]