This connector is set up and mapped for connection to a TIMY ONLY. Connecting this to a parallel port on a computer will not provide power for your photocell or headset circuits. If you are using a 520 you should use an external headset amp and batteries for your photocells however you may be able to power photocells via DIN connectors and proper cables if you do the following. (from the TIDO manual on the Alge website)
Power Supply:
The TIDO does not need a power supply or batteries. The TIDO can be supplied by the Timy directly. In case you want to have power supply output on pin 4 of the pho-tocell DIN-connectors, than you need a external power supply at the TIDO. Suitable as external power supply is the ALGE power supply PS12 connected at one of the photocell DIN-sockets.
May heat up the Headset circuit too??