Dynamixel RX-64 with an Arduino Uno and Dynamixel Shield

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I’m currently study about Dynamixel RX-64 with an Arduino Uno and Dynamixel Shield. I downloaded the Arduino IDE and the necessary library.(Dynamixel2Arduino, Dynamixel Shield) I opened the practice → DynamixelShield → basic → position_mode example.

I saw a blog that every dynamixel has different serial number,version and ID. So I changes some code.
(DXL_ID from 1 to 3,
DXL_PROTOCOL_VERSION from 2.0 to 1.0
dxl.begin(57600) the same. I want to use RX-64)

However, the Dynamixel doesn’t seem to be working. Did I miss something? Could you please help me troubleshoot?"

I sent you a code.
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#include <DynamixelShield.h>

#if defined(ARDUINO_AVR_UNO) || defined(ARDUINO_AVR_MEGA2560)
#include <SoftwareSerial.h>
SoftwareSerial soft_serial(7, 8); // DYNAMIXELShield UART RX/TX
#define DEBUG_SERIAL soft_serial
#elif defined(ARDUINO_SAM_DUE) || defined(ARDUINO_SAM_ZERO)
#define DEBUG_SERIAL SerialUSB
#else
#define DEBUG_SERIAL Serial
#endif

const uint8_t DXL_ID = 3;
const float DXL_PROTOCOL_VERSION = 1.0;

DynamixelShield dxl;

//This namespace is required to use Control table item names
using namespace ControlTableItem;

void setup() {
// put your setup code here, to run once:

// For Uno, Nano, Mini, and Mega, use UART port of DYNAMIXEL Shield to debug.
DEBUG_SERIAL.begin(115200);

// Set Port baudrate to 57600bps. This has to match with DYNAMIXEL baudrate.
dxl.begin(57600);
// Set Port Protocol Version. This has to match with DYNAMIXEL protocol version.
dxl.setPortProtocolVersion(DXL_PROTOCOL_VERSION);
// Get DYNAMIXEL information
dxl.ping(DXL_ID);

// Turn off torque when configuring items in EEPROM area
dxl.torqueOff(DXL_ID);
dxl.setOperatingMode(DXL_ID, OP_POSITION);
dxl.torqueOn(DXL_ID);
}

void loop() {
// put your main code here, to run repeatedly:

// Please refer to e-Manual(DYNAMIXEL Shield) for available range of value.
// Set Goal Position in RAW value
dxl.setGoalPosition(DXL_ID, 512);
delay(1000);
// Print present position in raw value
DEBUG_SERIAL.print("Present Position(raw) : ");
DEBUG_SERIAL.println(dxl.getPresentPosition(DXL_ID));
delay(1000);

// Set Goal Position in DEGREE value
dxl.setGoalPosition(DXL_ID, 5.7, UNIT_DEGREE);
delay(1000);
// Print present position in degree value
DEBUG_SERIAL.print("Present Position(degree) : ");
DEBUG_SERIAL.println(dxl.getPresentPosition(DXL_ID, UNIT_DEGREE));
delay(1000);
}