Newbie question about connecting diagram

I have purchased a 8 Channel 5V Solid State Relay Module Board.OMRON SSR 4 PIC ARM AVR DSP Arduino, from your Amazon bargains site. I am wondering if there is a diagram to connect this up. On the output side, which terminal is NO and which is NC? There is a set of terminals for the 8 inputs and then a separate ground, does this need to be connected to the common ground from the power supply?

Looking at a (presumably) identical **broken link removed**, it appears that the relays are SPST (single-pole, single-throw). SPST means each relay can control one circuit (single pole), and the common terminal has only one output connection (single throw). Thus, it's like a light switch... two wires, and they are either open, or close. You don't have an NO and NC (technically, you just have an NO, since the relay is open when unpowered).

Looking at the silkscreen connection information on the PCB, it looks like you have 8 INputs, and 1 common Ground (GND) point. In this case, yes, the ground pin on the input signal block should be tied to the same ground as your input logic circuits (which is, most likely, the ground on your power supply)

Relay datasheet (see specs for the version ending in -202P): https://www.sainsonic.com/zen/albums/ebay/nichegeek/20-018-200/05577d01.pdf