[Doug]’s newly-installed Yaesu FT-891 mobile transceiver failed to power up despite a careful installation, and it turns out to have ultimately been caused by a reversed cable. There’s … ...

The Cable Prowler PRO test kit includes the main unit, coax and network remote set, network/tel testing and ID remote #1, RJ12 cable, micro USB cable, protective silicone holster, and a hanging T3 ...

If so you just need to find the pin-out of both connectors and connect the dots. Googling "micros cash drawer conversion cable db9" provides a lot of options so this seems to be a solved problem.