USB connector inquiry.
Posted 26 August 2013 - 09:39 AM
Is it possible to get a USB cable with the 'B' connector at both ends?
My purposes are mysterious...
Posted 26 August 2013 - 02:47 PM
Thanks for the help, guys. According to both of you, they do or do not exist....
Posted 26 August 2013 - 08:48 PM
You have to describe what you'd like to accomplish.
"B" side is facing the "device" side. In USB term, a "host" (A-side) has to communicate with a "device" (a.k.a. "slave"), never a host-to-host or device-to-device.
Posted 27 August 2013 - 07:20 AM
The Sky wire cable ends in a 9-pin serial connection. I have a serial to USB adapter. The adapter's USB port is a 'B'-type. <---need to connect these --> The USB port on the Servo Cat is a 'B'-type.
You mention 'host' and 'device'. Does this imply that there is directionality to the USB wires? (I doubt this but...) In my case the either the SkySafari or the ServoCat could be considered the host or device....
There is a 'ServoCat' setting in the 'Telescope Settings' of my Sky Safari so I'm thinking all I have to do is connect the two devices and I'm off to the races...
Posted 27 August 2013 - 07:38 AM
Yes, USB is a master-slave communication arrangement, not just the physical cable connector's shape.
I assume you are using an iPad to run Sky Safari Plus.
In such case, you need an iPad USB "Host" cable (a.k.a. Apple Camera Connection Kit cable.)
/edit/ one line not so useful (used to be here, now deleted
In a nut shell, iPad becomes the "Host" (just like a personal computer). Via "Camera Connection Kit", then though a regular long USB cable, to connect to a USB "device" (e.g., a USB to RS232 serial port dongle.) <-- BTW, this is the same concept as SkyWire serial accessory does.
Note that "serial-USB dongle" -- long USB cable -- "USB-serial dongle", as back to back arrangement for long serial cable extender will not work. That will be a device-to-device communication, not what USB can support.
Posted 27 August 2013 - 08:32 AM
As I explained earlier, it cannot be done. It is not a matter of just connecting the cables together.
You would need a USB (host) to RS232 adapter and that adapter must be able to drive FT232 USB (device) used in ServoCAT. That adapter just does not exist as far as I know.
Also, the iPad/iPhone camera adapter suggested (with a USB connector) will not work as only limited number of types of USB devices are supported by iOS and FT232 is not one of them. Even if it was supported then it still would not work as SkySafari will not be able to talk to it - any USB accessory must be done under MFI (Made For iPhone) program and supported by the application. It is all quite complicated...
You really need to think about switching to a WiFi device...
Posted 27 August 2013 - 01:16 PM
I was hoping to save the $....
Posted 27 August 2013 - 01:19 PM
Thanks for your help, though.
Posted 27 August 2013 - 09:29 PM
Oh, that lovely tax:
no unsanctioned devices and must tie-in special device with specific app(s) rule.
Redpark device would be a great solution, since SDK is provided and one can create his own app or apps based on that (i.e., no more app lock-in.)
I'll have to check the Cydia based (minicom, 30-pin connector's LVTTL TxD and RxD) solution just for fun.
On the other hand, move over to the other camp with a decent device (Pad sized, full featured Android, that is) will forever forget this roadblock.
Lack of device driver? Simply recompile the kernel .