VMBGPOB doesn't respond

English
1

I will be doing my first Velbus installation shortly at my house, so to train a little bit i tried out some kind of mini-installation. I had only the basics on my desk just to figure some things out, being:

1 VMBSMPS
1 VMB4RYLD with 2 lightbulbs
1 VMBGPOB
1 VMB1USB

  • I did the scan and VMB4RYLD has been found. I renamed the adress to ‘1’. I can switch the lightbulbs on/off using my computer.
  • VMBGPO has been found. The adres (255,255,255,255,255) has been renamed to 2 (255,255,255,255). If i push the glass panel i can see it being ‘pushed in’ in velbuslink. However, if i try to operate it from velbuslink, there is no signal, while according to the manual the LED on it should blink.
    If i connect the button to the bulbs, there is also no effect.

I checked polarity, tried to strengthen all my cables and switched the 2 ‘term’'s to all 3 possible combinations but this didn’t help. I did synchronise btw.

Anyone know where the problem might occur?

  • Has it got anything to do with the adress? (just after scanning for the first time it said adress (255,255,255,255,255) instead of (FF) as stated in the manual?

  • Maybe something with the VMB1USB? The lower LED (nr4 on the datasheet) is red en the 2 following (both nr3) are blinking 4x in a second. In the manual it sais blinking is normal, however if they blink ‘fast’ there might be too high USB power consumption. Is 4x a second normal or fast?

Might be a newbie-question but i’m already stuck…

2

Address 255 (dec) is the same as FF (hex), so that’s just related to the display setting in View > Show decimal addresses.

In a Velbus installation only 2 terminators should be closed (jumper over the two pins), preferably at the furthest points. No more, no less.

Do the LEDs on the VMB1USB blink cyclically? Like 4 times fast, then pause, then 4 times fast, etc.?

Sometimes, due to for instance cable errors or false contacts, the bus goes in error mode and it takes a while to resolve errors. Try powering down, make sure all contacts are OK, then power up. make sure also you don’t have an H and an L mixed up.

If all goes well power LEDs on the modules should be continuously on, RX and TX LEDs should briefly flicker only when something is put on the bus.

3

Another hint, make sure the wires are fixed properly, had the same issue with my test enviroment and ‘temporary’ cabling with clamps.