Another noob relay board wiring question, should be quick!

Hi Folks!
I'm very new at this and my head is already overloaded with information! I would appreciate your help with a (hopefully) easy wiring question..
 
I purchased a 5 Volt relay board on an auction site that I think is appropriate (it is active high).
 
I plan on powering it with a seperate 5 V wallwart power supply to the DC+ and DC- terminals on the relay board.
 
Is it as simple as connecting the TTL1 output from the CAI board to the CH1 input on the relay board?
 
I do not connect the GND from the CAI board to anything, right?
 
(btw, the relay will be used to control a circulator in a solar hot water system)

Thanks in advance!

-l

BTW, you can find the board by searching for "1pcs 5v 2 Channel OMRON SSR G3MB-202P Solid State Relay Module For Arduino"
 
Many Thanks!

two grounds need to be connected, so that transistor base current loop can be  connected.

Thank you for the reply!
 
So to be clear, here is how I would connect it:
 
1. The positive of the power supply to the DC+ terminal of the relay
2. The negative of the power supply to the DC- terminal of the relay
3. The TTL1 output from the Webcontrol board to the CH1 input of the relay
AND
4. The GND output from the Webcontrol board to the same DC- terminal on the relay
 
Thanks for hanging in there with me!
 
-l

That is pretty much all the wirings.  Have fun!