2 channel TB6560 board question

[LagniappeRob]

I have a laser that blew a stepper board... I ordered a TB6560 tonight to replace it. Most everything lines up with the old board in terms of i/o lines. The one exception is the laser relay. The power supply is a JNMYDY.com.... There are inputs for the safety and enable switch (any open door or open the "laser" switch and the circuit opens). There is a variable power input going to the 10 turn pot (also capable of PWM). And 1 looks like it goes to the power meter. From what I can find there is only 1 pin for the laser input on the power connector. The PS connector is marked 5V, G, 24V and "L". I'm thinking the "L" must be for firing the laser... there's no other connections left. So any insight into what the PS might be looking for?

This is the PS: http://en.jnmydy.com/products_detail/&p ... 3a3b6.html

TIA,
Rob

(moved from the wrong forum)