This question already has an answer here:
How can I take long exposures on a Nikon D7000 with a wireless remote? I've read the existing question on this, but the answers there are not working for me. "Bulb" shows up when the shutter control is set to single mode, once I change to remote mode, the display changes to "---". Further, when I open the shutter with the remote, the shutter shuts on its own 30 seconds later - I do not get a chance to keep it open for longer.
What could be the difference between my setup and those of the earlier question which worked for the poster?