[Seven_of_Nine]

pawn Код:

/* Simple adminchat (RCON based) by Seven_of_Nine */
//TESTED
COMMAND:ac(playerid,params[]) {
    new
        poster[40],
        mess[128];

    sscanf(params,"s",mess);
    if(IsPlayerAdmin(playerid))
        if(!isnull(mess)) {
            for(new i = 0; i < MAX_PLAYERS; ++i) {
                if(IsPlayerConnected(i) && !IsPlayerNPC(i) && IsPlayerAdmin(i)) {
                    new
                        text[128];

                    GetPlayerName(playerid,poster,sizeof(poster));
                    format(text,sizeof(text),"[AdminChat] | %s: %s",poster,mess);
                    SendClientMessage(i,yellow,text);
                }
            }
        } else {
            return SendClientMessage(playerid,red,"USAGE: /ac [message], and admins will get this message.");
        }
    return 1;
}

Make sure you have included ZCMD.
Then, you can put it in a script or a filterscript