THORLABS PRO8 Series Operation Manual page 73

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 The installed IEEE 488 interface does not respond to the connected computer
 Do you have selected the option "Interface: IEEE488" in the PRO8000 setup
menu?
 Press "ESC" until you enter the setup menu. Use the  keys to select the
interface line, press the change button and select IEEE488 interface.
 Do you use the correct type of interconnecting cable?
 Install the appropriate cable.
 Did you install the cable after turning on the PRO8000/800 or the PC?
 Turn off both units and turn them on again.
 Is the correct device address of the PRO8000 (-4) / PRO800 given to your PC-
program?
 Refer to section 3.5, "Setup menu" on page 16 to see the present IEC-bus
address of the PRO8000 (-4) / PRO800 and enter the correct address in your
program (default address is 10) or change the actual IEC-bus address of your
PRO8000 (-4) / PRO800 corresponding to your PC-program.
 Is the PRO8000 (-4) / PRO800 the exclusive owner of the present IEC-bus address
or is there another device having the same address?
 Change the settings of the devices participating in that IEC-bus so that every
device has its individual address.
 The installed RS232 interface does not respond to the connected computer
 Do you have selected the option "Interface: RS232" in the PRO8000 setup menu?
 Press "ESC" until you enter the setup menu. Use the  keys to select the
interface line, press the change button and select RS232 interface.
 Do you use the correct type of interconnecting cable?
 Install the appropriate cable. (refer to section 4.1).
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© 2012 Thorlabs
Troubleshooting 69