Lately I got tariff for package from overseas with value over $800 but not for value less than $800. You may want to check the charges invoice if the shipping company charges correctly before paying. You can dispute the charges if they are incorrect.
Here are pcb ids and machine count. They're in Japanese but they say the same things as in English. I also included pictures of io pcb dipswitches and front of the PCs of both cabs.
I have no problem linking 2 cabs with a cat 5e crossover cable. I don't think it matters which one is set to id# 1 because mine left cab id is 2 and right cab id is 1. If you have 2 computers you can test the cable by pinging each other.
Mine the cable light is on and blinking when both cabs...