[Konstantinos]

pawn Code:

"ds[30]S(-1)[30]D(-1)",id,opc,opcs,opcd

use "r" for id and if the opc, opcs and opcd are string then use "s[ value ]"
For Example:

pawn Code:

new
    id, opc[ 30 ], opcs[ 30 ], opcd[ 30 ];

if( !sscanf( params, "rs[30]s[30]s[30]", id, opc, opcs, opcd ) )
{
    // Rest