Hi, the Bosch VG4 cameras that we use have a software setting to switch between biphase and RS485. There is also a switch to set the address. Both cameras need different ones. Two or more cameras on an rs485 wire need 1 end of line resistor at the farthest cam. Check to see if both have it already on and remove the nearest one. If you can just connect the Bosch and get it working separately, that will confirm that each is working. Then connect together to see.