MickeyB

On 24/06/2022 at 18:55, petrocorii said:

tldr: It seems the HC-05 is using the wrong serial parameters to connect to the mount, but these settings don't have documented AT commands.

I've also been looking at using the HC-05.

Connections to my Virtuoso mount work fine over a 3.3v serial cable. My Windows version of Synscan works fine using a cable.

Another way to test is to connect to the mount using a terminal program and type:

:e1

Typing these three characters plus a CR should produce the response "=0210A" from the mount.

This doesn't work for the HC-05, nor does Synscan.

I compared the output of the two connections using the trial version of "Advanced Serial Port Monitor". The working serial cable connects using these parameters:

Baud rate 9600

Data bits=8, Stop bits=1, Parity=None

Set chars: Eof=0x00, Error=0x00, Break=0x00, Event=0x00, Xon=0x11, Xoff=0x13

Handflow: ControlHandShake=(), FlowReplace=(XOFF_CONTINUE), XonLimit=2048, XoffLimit=512

 

The HC-05 module tries to connect to the mount using these parameters:

 

Baud rate 9600

Data bits=8, Stop bits=1, Parity=None

Set chars: Eof=0x00, Error=0x00, Break=0x00, Event=0x00, Xon=0x00, Xoff=0x00

Handflow: ControlHandShake=(DTR_CONTROL, CTS_HANDSHAKE), FlowReplace=(TRANSMIT_TOGGLE, RTS_HANDSHAKE), XonLimit=0, XoffLimit=0

Xon, Xoff, Controlhandshake, FlowReplace, XonLimit, XoffLimit have differing values.

The problem is, I can't find any documented AT commands to change these parameters on the HC-05 module. The only documented AT command related to UART parameters is "AT+UART", but this can only change baud, stop bit and parity settings. If no other parameters can be changed, then this probably won't work?

My apologies for the very late reply. My email settings where nok.

Looked into it a bit as well, with an old RPi 2b. Indeed those uart details seem not able to be set indeed.

Maybe i'll purchase the BT dongle someday, but i believe for now i'll be throwing in the towel on this one.

Thanks for the details though, learned a ton!

On 06/01/2021 at 18:21, powerlord said:

Sorry, should have been more clear. I made a bluetooth to serial interface with an HC-06.

This means I should be able to control the az-gti via the serial port as you would any other synscan mount, but via bluetooth.

So I expected sky safari or stellarium to then be able to connect to it via BT.

But something is not quite working yet. I'll try some more debugging tonight.

Saying that, since I'd always need the SyncScan app to actually align the scope up in the first place, and that only works with wifi, I'm very possibly not making anything any easier by getting this working. But.. it's cold, and cloudy so it gives me something to do 🙂

 

Sorry for the bump and hoping you're still around, but did you ever get it to work?

You see, I'm trying the same thing now. Have got things working with WiFi, but was/am hoping to go BT, directly to skysafari...