delphi中byte 的赋值(100分)

function PassIcDev(): Integer;
var
Password: Array[0..2] of Byte;
begin
Password(0) := $22;
Password(1) := $41;
Password(2) := $27;
st := csc_4442(icdev, 3, Password(0));
if st < 0 then
begin
Password(0) := $22;
Password(1) := $41;
Password(2) := $27;
st = csc_4442(icdev, 3, Password(0));
Password(0) := $22;
Password(1) := $41;
Password(2) := $27;
st = wsc_4442(icdev, 3, Password(0));
If st < 0 then
PassIcDev := CardErr
else
PassIcDev := CardOk;

end
else
begin
PassIcDev = CardOk;
end;
end;

Delphi 数组 赋值
用: Password[0] := $22;
而不是: Password(0) := $22;

轻问一下数值前加个$是什么意思?