I got the XJT / X8R combination now to work and forward the telemetry to the TX9R pro running v.110-mike ersky9x-r2176 revb-x. My gripe is that the documentation is fragmented and that I couldn't get telemetry to work. Simply nothing was displayed on the tx9r while it should at least give me a TSSI and a RSSI (the units are probably in dbm, is this correct?). The set-up is that a FrSky variometer sensor is connected to the s-port of the x8r, and that a futaba data cable goes from the XJT unit to the tx9r pro (I did not like these internal patches, so I went for the data cable). But still this does not give you anything under the telemetry display because of two reasons:
1) the X8R should be in d8 mode, the description is again incomplete IMHO. The procedure is: during binding you connect the signal pins of channel 7 and 8 on the x8r with a jumper, push the f/s button on the transmitter, set the left dip switch (1) on the XJT unit, and unset the second dip switch (2) (this is the factory default). While you push the transmitter f/s button you turn the transmitter on and it goes in binding mode. This result in a beeping transmitter. Now go to the receiver and turn it on with signal pins 7 and 8 connected with a jumper. Leave it like this for a while and turn everything off. Then remove the jumper between 7 and 8 on the x8r receiver (else it doesn't work), and turn everything on again. In this way you get a d8 telemetry link between the XJT and the X8R. The receiver LED should be faint green, in d16 it is bright green.
2) The next thing that nobody tells you is: on the transmitter you need to configure a frhub / met UsrProto, and FrSky com port should really be 2 (it differs from the default), invert com 1 should be off, com2 baud rate is 9600 baud, and the rest I did not change.
After both steps the altitude, RSSI, TSSI and a RTC can be displayed on a user configurable screen (there are 2). And voila, telemetry runs. I understand that it is difficult to write one complete manual for this all because of the different hardware components and open software that can be used. I've read several manuals and wiki pages, but it took me a while before I understood how to get it to work. Images of the relevant screens are attached. It is complicated because FrSky has a s-port sensor set-up and an analog (A1/A2) sensor set-up which I don't use. The variometer sensor is the first FrSky gadget I got, next will be a zaggometry kit to get the DJI NAZA V2 output into the telemetry stream.
All comments are welcomed, in particular when they explain what we see on these screenshots.
