How can I enable/disable autofocus when a signal triggers the FLIR A310 digital input?

In order to send commands to the camera, first you have to Telnet into it:

(Telnet is disabled by default on Microsoft Windows, so you have to enable it. Google "how to enable telnet windows" for instructions: it is straightforward.)

To disable autofocus when the digital input is triggered, do the following:

• Telnet to the camera's IP address.
• Send the following commands to the digital input you want to disable autofocus for:
  rset .dighandler.digin1 "disable"
  rset .dighandler.digin2 "disable"

To enable autofocus when the digital input is triggered, do the following:

• Telnet to the camera's IP address.
• Send the following command to the digital input you want to enable autofocus for:
  Digital Input 1: rset .dighandler.digin1 "auto"
  Digital Input 2: rset .dighandler.digin2 "auto"