Join two digital status value

Using Arduino Programming Questions
1

Dear all.
I am working with Modbus library with arduino. I have totally 30 parameter

24 hall sensor, 1 temprature sensor, 1 hv sensor, 1 disconnector status, 1 spd status, 1 device id.

But as soon as enter start address from 0- 30 i wont get error. if i say 0-31 i get check sum error.

Where i have mentioned array size has uint16_t au16data[32];

I dont have much more idea over modbus, Since i found code working i have implicated using it.

Since I have two digital signal status & 1 device ID . Is possible to combine them & store in one array

I mean to say

How can i represent buffer with array value store as [device_ID]+[SPD_Status]+[DC_Status]

While view in Modbus scan i should see buffer like

100 means 1-> device ID, 0-SPD_Status, 0-DC_Status

110 means 1-> device ID, 1-SPD_Status, 0-DC_Status

Is it possible to CONCATENATE value & store as integer value

int SPD_STATUS_PIN=6;
int DC_STATUS_PIN=7;
unsigned  int DC_STATUS=0;
unsigned int SPD_STATUS=0;

void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
int Spd=SPD_Check();
int DC_Sta= DC_Status();


delay(1000);
}


int SPD_Check()
{

  SPD_STATUS=digitalRead(SPD_STATUS_PIN);
  return(SPD_STATUS);
}

int  DC_Status()
{

  DC_STATUS=digitalRead(DC_STATUS_PIN);
  return(DC_STATUS);

}
2

Is it possible to CONCATENATE value & store as integer value

You could have device addresses from 0 to 214 and still have room for the two status bits, in a 16 bit variable (or array element).

unsigned int devID = 14;
byte status1 = 0;
byte status2 = 1;

unsigned int concat = (devID << 2) + (status1 << 1) + status2;

Getting the data back out is equally trivial using & and >>.