MODBUS Communications Driver
New in Version 2.1
In order to improve reliability, we have changed to a new type of hardware key manufactured by Rainbow Technologies. Unlike previous keys, this key can be used on parallel ports other than LPT1. To change the port where the Driver will look for the key, call MBDRV with the function synopsis:
where PORTN is the integer number of the parallel port where the key is located (1 to 3).
If you are using the default port, LPT1, there is no need to call the SetKeyport function. Rather than checking the key once upon loading, the Driver now checks the key at random intervals. The Driver will return a status of -2 if the key is not detected.
The SetKeyport command is described in more detail on page 18.
Support for “software key” protection has been discontinued.