24/01/2017
Mission planner could talk with RFD 900 and RFD 900+ diversity radio modems without problem. It isn’t the case with the latest RFD 900x.
Apparently it is due to a little change in the way the 900x needs to be “talked to”. In the mean time I have useless modem sets 
RFD900x is supposed to have bell and whistles, at the moment it is more a bricked featureless if mission planner can’t talk to it.
Henri
please try the latest beta MP
help > update beta
@Michael_Oborne
Thank you for answering.
I did load the beta verion before attempting to look at the RFD 900X. (See result in screen grab below)
Just for info: Using hyper terminal can talk to this modem and the AT command works fine.
Kind regards
Henri
can you run all the at command in hyperterminal and post a picture of the answers?
please try the latest beta.
its been updated again
Hi Michael.
By the way I did try to change some parameters on the RFD 900X, such as S3 that I did set to 65 and stored the value with AT&W. Then rebooted the modem and value was correct.
So it definitely shows this modem to be alive.
Here is AT command and answers from the old hyperterminal:
OK
ATI
RFD SiK 2.53 on RFD900xR1.1
ATI2
131
ATI3
0X0091
ATI4
255
ATI5
S0:FORMAT=32
S1:SERIAL_SPEED=57
S2:AIR_SPEED=64
S3:NETID=65
S4:TXPOWER=30
S5:ECC=0
S6:MAVLINK=1
S7:OPPRESEND=0
S8:MIN_FREQ=915000
S9:MAX_FREQ=928000
S10:NUM_CHANNELS=20
S11:DUTY_CYCLE=100
S12:LBT_RSSI=0
S13:RTSCTS=0
S14:MAX_WINDOW=131
S15:ENCRYPTION_LEVEL=0
S16:GPI1_1R/CIN=0
S17:GPO1_1R/COUT=0
R0:TARGET_RSSI=255
R1:HYSTERESIS_RSSI=50
ATI6
silence_period: 252
tx_window_width: 6354
max_data_packet_length: 249
packet_latency: 126
ATI7
L/R RSSI: 0/0 L/R noise: 79/0 pkts: 0 txe=0 rxe=0 stx=0 srx=0 ecc=0/0 temp=28
dco=0
ATS0?
32
ATS1?
57
ATS2?
64
ATS3?
65
ATS4?
30
ATS5?
0
ATS6?
1
ATS7?
0
ATS8?
915000
ATS9?
928000
ATS10?
20
ATS11?
100
ATS12?
0
ATS13?
0
ATS14?
131
ATS15?
0
ATS16?
0
ATS17?
0
ATS18?
ERROR
With “Beta updated” version of Mission planner, it does connect to the modem. 
Thank you Michael. below is a screen grab of the successful connection.
I’ll try to connect to the airframe when daylight shows and will try CPPM as well. Will measure latency on CPPM with a scope.
Kind regards
Henri
Very great timing!
I started testing 2 RFD900x yesterday and ran into the same issue
I will try the Beta of MP and check back.
@mjbunan Will you use CPPM capabilities of the RFD 900X as well?
Henri
Mine just arrived today!
Will be using PPM Passthrough feature…IF I can figure out how and which pin to use.
Anyone can provide a shortcut?
If you look at the setup screen, I would think depending if you set GPI1R/C in or out the CPPM function would be enable.
This is, however, a question for Seppo at rfdesign…
Henri
just for those that don’t realize it
GPI1_1 = R/C In or R/C Out
I am attempting to use the RFD900x to passthrough PWM or PPM…
From other discussions it seems that “GPI1_1 = R/C In or R/C Out” refers to RFD900x GPIO Pin 15 (or P2.6). Is that correct? I was trying to use PIN 13 (of P0.1)…
Some clarification on the setup would be great.
I am assuming that I setup
GPI1_1R/CIN checked at the transmitter end of the link and
GPI1_1R/COUT checked at the other end of the link.
Do I need to setup the radio with AT commands to make the pins at the transmitter end Inputs or is the PPM function separate from these settings?
RTPP
put Val: 0
Pin:1 Output Val: 0
Pin:2 Output Val: 0
Pin:3 Output Val: 0
Pin:4 Output Val: 0
Pin:5 Output Val: 0
ATPP
Pin:0 Output Val: 0
Pin:1 Output Val: 0
Pin:2 Output Val: 0
Pin:3 Output Val: 0
Pin:4 Output Val: 0
Pin:5 Input Val: 1
ATPI=4
OK
ATPP
Pin:0 Output Val: 0
Pin:1 Output Val: 0
Pin:2 Output Val: 0
Pin:3 Output Val: 0
Pin:4 Input Val: 1
Pin:5 Input Val: 1
RTZ
Thanks for a prompt reply - the project is getting urgent.
Michael Nunan
Will you use CPPM capabilities of the RFD900X as well?
Great found this thread !
Any one know how to connect the Rc Transmitter ?
Someone said use pin15 for signal cable. How about the rest ? 5v and Ground ?
If you look at the RFdesign provided documentation you’ll see:
Pin 2 is GND and Pin 4 is +5V
Easy enough?
Hi,
Any updates on the testing of the 900x?
I am really interested in knowing if the latency of PPM is good enough as well as reliability.
I already have a couple of 900+ but they are incompatible with the 900x so im not sure if it is worth it.
Thanks for your comments.
MM
Hey, I know this is an old thread.
Did you manage to get this working?
I’ve set it up the same as you, but to no avail.
I did get it working. Using it to drive a gimbal, I setup failsafe values to keep the servo from doing unwanted moves during failsafe.
Do you think you could send a screenshot of your radio parameters from modem tools?
