note 45546 added to function.dio-open

I'm trying to control a modem using PHP, this involves sending and receiving AT commands to the COM port. I can send AT commands to the modem using fopen(), but cannot receive the command response. Can anyone suggest a better way of doing this using the "dio" function set? I've been trying for weeks, any help is appreciated. Many thanks in advance. ---- Manual Page -- http://www.php.net/manual/en/function.dio-open.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+45546 Delete -- http://master.php.net/manage/user-notes.php?action=delete+45546&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+45546&report=yes Search -- http://master.php.net/manage/user-notes.php