Send PelcoD commands with max485

i’ m trying to send PelcoD commands to my PTZ camera, but i m a beginner with serial 485 so i looked some posts from other guys and some websites explaining:
and this for wiring:

So in finally wrote my code: i want to call Preset1.
Due to this protocol ( i have to send this command:
0xFF, 0x01, 0x00, 0x07, 0x00, 0x01, 0x09

so i followed wiring
DI (data in) to pin 11
RO (receive out) to pin 10
DE (data enable) and RE (receive enable) jumpered together and to pin 3
Vcc and Gnd connected
A and B : the RS485 pair
Gnd between distant Arduinos can be in cable or local electrical ground.

and this is the sketch:

#include <SoftwareSerial.h>
/-----( Declare Constants and Pin Numbers )-----/
#define SSerialRX 10 //Serial Receive pin → RO
#define SSerialTX 11 //Serial Transmit pin → DI

#define SSerialTxControl 3 //RS485 Direction control → DE in corto con RE

#define RS485Transmit HIGH
#define RS485Receive LOW

#define Pin13LED 13 //led di stato

/-----( Declare objects )-----/
SoftwareSerial RS485Serial(SSerialRX, SSerialTX); // RX, TX

/-----( Declare Variables )-----/
int byteReceived;
int byteSend;
int i;
byte comandodainviare[7] ={0xFF, 0x01, 0x00, 0x07, 0x00, 0x01, 0x09};

void setup() /****** SETUP: RUNS ONCE ******/
// Start the built-in serial port, probably to Serial Monitor
Serial.println(“ SoftwareSerial remote loop example”);
Serial.println(“Use Serial Monitor, type in upper window, ENTER”);

pinMode(Pin13LED, OUTPUT);
pinMode(SSerialTxControl, OUTPUT);

digitalWrite(SSerialTxControl, RS485Receive); // Init Transceiver inizia con la configurazione di ricezione

// Start the software serial port, to another device
RS485Serial.begin(2400); // set the data rate verso il dispositivo esterno (tipo la telecamera)

}//–(end setup )—

void loop() /****** LOOP: RUNS CONSTANTLY ******/

Serial.println(“inizio loop”);


digitalWrite(Pin13LED, HIGH); // Show activity
digitalWrite(SSerialTxControl, RS485Transmit); // Enable RS485 Transmit
//RS485Serial.write(comandodainviare[1]); // Send byte to Remote Arduino



digitalWrite(Pin13LED, LOW); // Show activity

digitalWrite(SSerialTxControl, RS485Receive); // Disable RS485 Transmit

Serial.println(“Fine Loop”);

}//–(end main loop )—

but the camera doesnt go to Preset1, even if with her keyboard it does.
is there a problem in the code? can someone help me using MAX485 ?
Thank you so much!

First: Edit your post and insert code tags!

You should read the response of the addressed device. Did you check that the device has address 1?

The linked manual says nothing about the serial parameters. Is 2400 baud and 8N1 correct?

You should not hold the driver enabled for 3 seconds after sending the last character.