Problems communicating between a PC and an AC256 type controller.


  • I cannot logon to an AC256 or AC8 controller.
  • My AC256 Xdriver has stopped communicating with the AC256.

Product Line

Andover Continuum, Other


  • AC256
  • AC256+
  • AC8
  • AC8+


Unable to establish communications with an AC256 type controller.


The attached document contains a thorough set of procedures for troubleshooting communication issues between an AC256 controller and a computer that is running a terminal emulator program such as ProComm or HyperTerminal. This requires that the computer have a available serial port or a USB to serial converter. 

Troubleshooting AC256+ Comm Issues.doc