To test telemetry out of DVR what should i get if i put a meter across RX and TX when joystick in use?

Anything?

To test telemetry out of DVR what should i get if i put a meter across RX and TX when joystick in use?

Anything?

Yes, the voltage should vary.

0-6 VDC Generally IIRC

Use an Led, works every time.

Use an Led, works every time.

Great idea!

Thanks guys. I did have telemetry, now i havent.

Tried rs485, rs422, all different combinations of protocols, and nothing.

Cable is okay. Hoping its a simple case of plug on circuit board being duff.

http://www.ebay.co.uk/itm/3-5-inch-LCD-Monitor-CCTV-Security-Test-Tester-Camera-Video-PTZ-Audio-UTP-12V-/251172254713?pt=UK_BOI_Electrical_Test_Measurement_Equipment_ET&hash=item3a7b0873f9

a cheap & cheerfull cctv tester is quite a handy thing to have on hand

http://www.ebay.co.uk/itm/3-5-inch-LCD-Monitor-CCTV-Security-Test-Tester-Camera-Video-PTZ-Audio-UTP-12V-/251172254713?pt=UK_BOI_Electrical_Test_Measurement_Equipment_ET&hash=item3a7b0873f9a cheap & cheerfull cctv tester is quite a handy thing to have on hand

Agreed. I have a systemq one and a very handy little gadget.

Cheap??

Unfortunately its not something i can afford and im not lucky enough to have one provided by the company

An LED across the + and - then go and move a cam. If it lights up then the DVR is ok for telem.