You do not need an rs232 cable. These were needed with the old style telephone plug connector handsets. But you have the new style, that has the device that converts the usb signal to a serial signal built in. Celestron made something simpler for once
You connect the handset to the mount, and then connect the bottom of the handset to the USB hub. Connect both cameras to the hub also. Connect the hub to your computer.
I use this hub https://smile.amazon...ie=UTF8&psc=1
WIth your rig you need only 3 ports, so you can use the extra for a future focuser, filter wheel etc. Or, buy a bigger one right now.
You will need to get a USB extension cable like this one https://smile.amazon...le?ie=UTF8&th=1
With a cord this long, I suspect the powered USB hub is essential.
Connect this cable to your pc.
Its unclear if you power your scope with a battery, or with a wall wart. Either way, use a splitter to power both the mount and hub. A splitter like this https://smile.amazon...2dDbGljaz10cnVl
You will need to pay attention to the size of the power connector on the hub, and plan accordingly.
FWIW, I have used a talentcell li-ion battery attached to the mount using scotch brand heavy duty hook and loop fastener. https://smile.amazon...e?ie=UTF8&psc=1
I use the 12v outlet to power the mount and the usb to power the hub. With the sabrent hub I use, I need an "unconventional" USB cable https://smile.amazon...e?ie=UTF8&psc=1
Edited by nic35, 01 February 2022 - 09:35 AM.