// calculate first voltage digit
// set array values locations to hold the command
commandArray[0] = 's'; // s for send sdm
commandArray[1] = '0'; // command size
commandArray[2] = 'D'; // command size
commandArray[3] = '1'; // delay
commandArray[4] = '9'; // delay
commandArray[5] = '1'; // destination
commandArray[6] = '2'; // destination
commandArray[7] = '3'; // destination
commandArray[8] = '4'; // destination
commandArray[9] = '5'; // destination
commandArray[10] = '6'; // destination
commandArray[11] = '7'; // destination
commandArray[12] = '8'; // destination
commandArray[13] = digit1Int; // voltage
commandArray[14] = digit2Int; // voltage
commandArray[15] = digit3Int; // voltage
Is commandArray[] ints or chars?