how open one order

hi,,

how make expert RSI

if  RSI< 50 and move up 50 open order buy but not open every Tick jut one open position if move up RSI 60 open other position buy

if RSI down 50 or 40 sell

i need control number of position, i try make expert RSI but it's open order every tick :(

how make this if move up to 50 open one order buy and move up 60 open other order buy ... etc

and sell if down 50 sell one order move down 40 sell other order ... etc

sorry my English not good

thank you