Search found 12 matches

by jobijobi
30 Oct 2020, 15:45
Forum: Hardware
Topic: GND, Chassi GND and RS-485 GND clarification (Revpi connect)
Replies: 1
Views: 1964

GND, Chassi GND and RS-485 GND clarification (Revpi connect)

Please see picture attached:

- Is 0V the same net as the GND symbol on the RS-485 connector

- Please clarify the use-cases for the chassi-gnd, i.e. when and when not to use it


Thanks
by jobijobi
30 Aug 2020, 15:40
Forum: Hardware
Topic: revpi connect - rs485 header specs / power output?
Replies: 8
Views: 4999

Re: revpi connect - rs485 header specs / power output?

Dirk,

What did you mean by "Only use GND if you really know what you are doing." ?
by jobijobi
07 Aug 2020, 11:41
Forum: Hardware
Topic: revpi connect - rs485 header specs / power output?
Replies: 8
Views: 4999

Re: revpi connect - rs485 header specs / power output?

please also help specify the voltage spec for the rs485 phy

it's not clear from the schematic that has both 3V3 + "VCCIO", see below:
by jobijobi
07 Aug 2020, 11:39
Forum: Hardware
Topic: revpi connect - rs485 header specs / power output?
Replies: 8
Views: 4999

Re: revpi connect - rs485 header specs / power output?

ping!
Does kunbus provide a RS485 with galvanic isolation?
by jobijobi
21 Jul 2020, 17:56
Forum: Hardware
Topic: Gateway schematics / Fieldbus
Replies: 2
Views: 2637

Gateway schematics / Fieldbus

Hi,

Are the schematics available for the serial gateways?
Mainly interested in the Fieldbus Gateway.

The manual reads that Pin 1 is 5V fused, but can't find any info on how much current it can source, nor if the supply out is isolated.


Thanks
by jobijobi
21 Jul 2020, 17:30
Forum: Software
Topic: modbus discovery and address assignment
Replies: 3
Views: 2542

Re: modbus discovery and address assignment

With 'PiCtory', you can be both master or slave. If you happen to run two slaves with on the same bus, with same address, how is this handled today? My idea was that we could have a graceful error-handling to resolve duplicate address conflicts. It would be enough with the error-handling, then it's ...
by jobijobi
21 Jul 2020, 17:26
Forum: Software
Topic: DFU over Modbus
Replies: 3
Views: 2674

Re: DFU over Modbus

Hi!

There is a service in your kernel/OS to let the revpi connect be a modbus rtu master.
Do you happen to have any implementations to run firmware-upgrades (to a connected rs485 slave) over modbus?
by jobijobi
21 Jul 2020, 17:19
Forum: Hardware
Topic: revpi connect - rs485 header specs / power output?
Replies: 8
Views: 4999

Re: revpi connect - rs485 header specs / power output?

Hi Dirk,

I just found the schematic, I thought pin-1 was 5V supply.

For RS485 devices that require to be bus-powered (similar to profibus).
What would you recommend?

Does kunbus provide a module with RS485 and/or profibus with power-supply and signaling + galvanic isolation?


Thanks
by jobijobi
08 Jul 2020, 01:33
Forum: Software
Topic: DFU over Modbus
Replies: 3
Views: 2674

DFU over Modbus

Any implementations from raspberry -> target (arm cortex) do run a DFU/firmware update via modbus?