Multiple stacks using RS485

[bixator]

Hi,

 

If I understand correctly, I could use the RS485 extensions to have

one or more "remote" stacks which I could get access to from a

single brickd instance. Is this correct ?

Is there anyway to achieve the same "distributed stacks" managed

by a single brickd instance over Ethernet this time ?

Last, can we use the RS485 extensions with 2 wires only ?

Thanks.

 

[borg]

Hi,

 

If I understand correctly, I could use the RS485 extensions to have

one or more "remote" stacks which I could get access to from a

single brickd instance. Is this correct ?

Yes, exactly!

 

Is there anyway to achieve the same "distributed stacks" managed

by a single brickd instance over Ethernet this time ?

With the Ethernet Extension you need 0 external instances of brickd. In case of Ethernet you connect directly to the IP of the Ethernet Extension. The Ethernet Extension itself provides brickd.

 

Last, can we use the RS485 extensions with 2 wires only ?

Thanks.

No, you need 3 wires.

[bixator]

Hi,

 

Thanks a lot for your quick reply.

 

Is there anyway to achieve the same "distributed stacks" managed

by a single brickd instance over Ethernet this time ?

With the Ethernet Extension you need 0 external instances of brickd. In case of Ethernet you connect directly to the IP of the Ethernet Extension. The Ethernet Extension itself provides brickd.

Unless I'm wrong, a client application would need to connect to each

brickd instance running in the Ethernet Extension, which I'd like to

avoid.

So, I guess that there is no "brickd to brickd" protocol ?

 

Last, can we use the RS485 extensions with 2 wires only ?

Thanks.

No, you need 3 wires.

 

So, does this means that the RS485 Extension does not support half duplex ?

Does this mean also what we can't connect a RS485 extension to

a non-TKF 485 device ?

 

Thanks.

 

[borg]

Unless I'm wrong, a client application would need to connect to each

brickd instance running in the Ethernet Extension, which I'd like to

avoid.

So, I guess that there is no "brickd to brickd" protocol ?

Right, there is no brickd to brickd protocol, you need to open a IPConnection per Ethernet Extension.

 

So, does this means that the RS485 Extension does not support half duplex ?

Does this mean also what we can't connect a RS485 extension to

a non-TKF 485 device ?

 

The third connection is for GND, it will likely not work well if you don't connect GND.

[bixator]

OK, thanks for the advise.

[bixator]

Hi,

Still on the RS485 topic, I'm planning to build a "remote stack" with:

• a RS485 master extension
  
• a Servo Brick
  
• 4 PTC bricklets
  
• a Dual Relay Bricklet
  
• 2 master bricks
  
• a setp down power supply brick
  

 

Is this remote access over RS485 going to "stand the load" ?

I suspect that the PTC bricklets could generate bunch of

trafic...

 

Thanks.

[borg]

I don't think that this stack should make any problems regarding throughput. But it depends on the programs you intend to run with it, of course.

[bixator]

Thanks. One last question, what would be the minimal ambiant temperature operation of such a stack ?

Thanks.