Yes, all but one are marked. The ones marked are SGND (assuming this is ground, not sure what the "s" at the beginning is supposed to mean, VCC, FREQ, TX, and RX. The way this thing is made, it's going to be difficult for me to power it and get readings from the pins. The solder points are on the bottom of circuit board and unless I extend the wires I can't put the board in upside down hehe.I'll play around with it and see if I can find a way to read the voltage off the pins. Hopefully the voltage is lower than 5 volts so that I don't have to get an additional adapter.
Ok, was able to get to the pins from the top side. Pilled off some glue around the cable and there was just enough bare wire for me to get my probes on. The VCC reads at 3.725 volts, the TX 3.18 volts and the RX 2.22 volts.So guess that means it's a TTL signal since they are less than 5 volts?