rs485

[SiriasRaji]

Hi,

We are having one requirement to connect the RS485 in such away that the bus lines will be connected to the couplers using two terminal blocks. and from the coupler it will be routed to two terminal box then it will be routed to single point. From which different nodes will be connected. My question is, Is this type of connection is suggestible or not.

Any one help me please.

[K C]

Hi,

Normally you should carefully layout your RS-485 connection. Daisy-chained, (no (long) stubs, twisted pair cable, terminators at both end, preferable one active and one passive terminator, not too many loads, etc.

But RS-485 is also works (for a simple test) with only two wires at a short distance.

It all depends on the circumstances. What is the distance of the network, what is the transmission speed, how many connection. ???

Can you draw the network ?

Kees

[SiriasRaji]

Please find the attached rs485 diagram.

[K C]

The picture shows two branches of RS-485 network from one point. It is a ring. That is not possible. It should be a daisy chain.

Describe the coupler and the terminals, What is the distance and speed

[SiriasRaji]

The distance is around 5 meters and the baud rate is 9600 bps.

[K C]

For rs-485 that is a low  distance and low speed.

Still your drawing is not a daisy chain. Why two branches in this network ?  Which converters are you using ?

[SiriasRaji]

For redundancy purpose our customer is using this kind of network and we are using ADM 485 at source side and ADM2483 at destination.

[K C]

If you use two of these devices at both sides,having two separate networks it should be OK. But in your drawing it looks like they connected together.

With this distance and speed you can have some terminals in between, it still will work OK I expect.