Hello everyone …
I want to connect a pixhawk (px4 black cube) Autopilot with Microhard ( n920x2) modems
First of all I have connected the wires of Data connector of Slave Modem to (Telemetry 1) port as following :
Rx (pin 2) of Slave to Tx of pixhawk
Tx (pin 3) of Slave to Rx of pixhawk
GND (pin 5) of Slave to GND of pixhawk
All remaining wires in both Slave and Telemetry 1
Has neglected …
The Budrate of both Slave and Master set as : 57600
Pixhawk Serial 1 budrate :57600
COM port of PC budrate : 57600
Pixhawk Serial 1 protocol : MAVLINK1
Slave protocol : transparent
Master protocol : Transparent
Master and Slave Serial channel Mode : RS232
When I connect Slave modem to pixhawk and Master modem to pc I noted that Slave modem RSSI LEDs (that represents the received signal strength) turn on
But RSSI LEDs of Master modem doesn’t !
Then when I open Mission planer software the RSSI LEDs immediately turn on !
After that I selected the COM port that the Master modem is connected with, then I clicked on connect
But the software didn’t detecte the pixhawk .
Is there any one have a suggestion to solve that please ?
the following pictures show the Master and Slave modems parameters
(These pictures has captured in Hyper terminal Software)
Those modems expect RS232, which is up to +/-12v swing, or at least +/-3 volt swing, so you will need RS232 converters, since all the flight controllers have only a 0v to 3.3v swing.
Unless you’ve got a way of setting it to accept TTL or 3.3v
Basically those modems are not made for this purpose, and you’ll have to do some extra work - and I’m unsure if it’s even possible to get them to work in this application.
I already have RS232 TO TTL Converter and I have tried to connecte it in FOUR way :
Way 1:
Tx of RS232 converter → Rx of Slave Modem
Rx of RS232 converter → Tx of Slave Modem
GND of RS232 converter → GND of Slave Modem
Tx of TLL converter → Rx of Pixhawk Telem1
Rx of TLL converter → Tx of Pixhawk Telem1
GND of TLL converter → GND of Pixhawk Telem1
5V of TLL converter → Vcc of Pixhawk Telem1
Way 2:
Tx of RS232 converter → Tx of Slave Modem
Rx of RS232 converter → Rx of Slave Modem
GND of RS232 converter → GND of Slave Modem
Tx of TLL converter → Tx of Pixhawk Telem1
Rx of TLL converter → Rx of Pixhawk Telem1
GND of TLL converter → GND of Pixhawk Telem1
5V of TLL converter → Vcc of Pixhawk Telem1
WAY 3 :
Tx of RS232 converter → Rx of Slave Modem
Rx of RS232 converter → Tx of Slave Modem
GND of RS232 converter → GND of Slave Modem
Tx of TLL converter → Tx of Pixhawk Telem1
Rx of TLL converter → Rx of Pixhawk Telem1
GND of TLL converter → GND of Pixhawk Telem1
5V of TLL converter → Vcc of Pixhawk Telem1
WAY 4 :
Tx of RS232 converter → Tx of Slave Modem
Rx of RS232 converter → Rx of Slave Modem
GND of RS232 converter → GND of Slave Modem
Tx of TLL converter → Rx of Pixhawk Telem1
Rx of TLL converter → Tx of Pixhawk Telem1
GND of TLL converter → GND of Pixhawk Telem1
5V of TLL converter → Vcc of Pixhawk Telem1
But in all ways there is no connection between Mission planer software and pixhawk !
