Applies To:
  • CitectSCADA 5.20

To allow you to use the Modbus Slave driver as a Remote I/O Device in dial back mode, a new feature has been added. 

By writing to register 410000, you may send a string out the serial port. You should define a string tag at address 410000 and then anything you write to this tag will be written out the serial port. You cannot read from this register.

So you can force the MBSLAVE driver to dial a modem by sending the modem AT command out the serial port. You then must transmit the caller ID string to allow the remote Citect to recognise the identity of the caller.