What is the iOptron RS232-RJ9 Serial Cable used for?
The iOptron RS232-RJ9 cable is used for two primary purposes: firmware updates for the mount and hand controller, and direct PC control of the mount using planetarium software or ASCOM-compliant imaging applications.
Do I need this iOptron cable to update the firmware on my mount?
It depends on the mount. On current mounts such as the CEM40, the RS232 port on a Go2Nova 8407+ hand controller is used only for hand controller firmware upgrades, and an 8410 hand controller is upgraded through the mount's main board instead. Check your mount's manual for its upgrade method.
My computer doesn't have a serial port. Can I still use the iOptron RS232-RJ9 cable?
Yes, but you will need an additional accessory. If your computer only has USB ports, you must use a high-quality USB-to-RS232 (DB9) adapter. The adapter creates a virtual COM port on your computer, which you then connect this iOptron cable to.
Will this cable allow me to control my iOptron mount with software like Stellarium or N.I.N.A.?
Yes. This cable provides the physical connection needed for software control. Once connected (with a USB-to-Serial adapter, if necessary), you will need to install the appropriate iOptron ASCOM driver on your PC. This driver allows applications like Stellarium, Cartes du Ciel, or N.I.N.A. to communicate with and control your mount.
Is this the same cable that connects the hand controller to the iOptron mount?
No, it is not. The cable that connects the hand controller to the mount uses 6-pin RJ11 plugs on both ends. This RS232-RJ9 cable is specifically for connecting the mount (or hand controller port) to a computer's serial port.
How do I connect the iOptron RS232-RJ9 cable to control my CEM40 for imaging the Orion Nebula (M42)?
On a CEM40 this cable is only used for hand controller firmware upgrades, through the RS232 port of a Go2Nova 8407+ hand controller; the CEM40 itself is controlled from a computer through the USB port on the mount, without this cable. For that upgrade the RS232 end connects to your computer or a USB-to-serial adapter. To control the CEM40 for imaging M42, connect a USB cable between the mount and your computer and use the iOptron Commander/ASCOM driver with your planetarium or imaging software.
