Search found 16 matches

by Fabrizio
21 Nov 2024, 19:05
Forum: Software
Topic: Modbus RTU maximum channel number
Replies: 11
Views: 9782

Re: Modbus RTU maximum channel number

Hello Dirk.
Yes, I'm writing my own modbus driver accessing directly to RS485 interfaces and in this manner I'm resolving all my problems.

Thank you and best regards.
Fabrizio
by Fabrizio
18 Nov 2024, 17:00
Forum: Software
Topic: Modbus RTU multiple registers access
Replies: 7
Views: 4847

Re: Modbus RTU multiple registers access

Thank you Dirk.
As soon I will be able to perform more tests, I'll be back with the information you requested.
(now I have to manage a bigger problem related to the maximum number of actions that can be performed by RevPI - refer to my post on the other thread related to this)

Thank you,
Fabrizio
by Fabrizio
18 Nov 2024, 16:58
Forum: Software
Topic: Modbus RTU maximum channel number
Replies: 11
Views: 9782

Re: Modbus RTU maximum channel number

Hello Dirk. I'm trying to communicate with more than 32 slave registers (I configured a Modbus RTU Master 150 to allow this configuration on Pictory), but it seems that no more than 32 actions can be performed by RevPi. I'll try to better explain my tests. I configured 48 actions on Pictory to acqui...
by Fabrizio
13 Nov 2024, 12:11
Forum: Software
Topic: Modbus RTU multiple registers access
Replies: 7
Views: 4847

Re: Modbus RTU multiple registers access

Hello Dirk. I'll try to give you more details about my necessity. To optimize the communication, I would like to send commands to read/write multiple registers at one time on every single slave (my modbus has a lot of slaves). This will be useful to reduce the polling interval of every connected sen...
by Fabrizio
11 Nov 2024, 11:13
Forum: Software
Topic: Modbus RTU multiple registers access
Replies: 7
Views: 4847

Modbus RTU multiple registers access

Hello. I'm using a RevPi Flat S to communicate with 2 different modbus channels. To optimize the polling sequence, I would like to use the "Read Multiple Holding Register" and "Write Multiple Holding Register" function codes (3 and 16 respectively). I saw that it is possible to c...
by Fabrizio
02 Aug 2024, 14:56
Forum: Software
Topic: Modbus RTU maximum channel number
Replies: 11
Views: 9782

Re: Modbus RTU maximum channel number

Thank you Dirk.
I'll proceed with RevPi Flat.

Regards,
Fabrizio
by Fabrizio
31 Jul 2024, 10:09
Forum: Software
Topic: Modbus RTU maximum channel number
Replies: 11
Views: 9782

Re: Modbus RTU maximum channel number

Hello Dirk. I find that the RevPI Flat has 2 different RS485 channels (I didn't found it previously!). So I suppose it can be used to manage my previous request (have 2 Modbus RTU Master channels). Are they completely independent and configurable with different communication settings? Thank you. Fab...
by Fabrizio
30 Jul 2024, 11:10
Forum: Software
Topic: Modbus RTU maximum channel number
Replies: 11
Views: 9782

Re: Modbus RTU maximum channel number

Thank you very much Dirk, for the useful information. I can also evaluate the use of another RevPi module, different from the Compact version I already used. The purpose is to have more than one Modbus RTU Master bus, so I can distribute all the sensors I have to manage on 2 buses. Could you suggest...
by Fabrizio
29 Jul 2024, 10:31
Forum: Software
Topic: Modbus RTU maximum channel number
Replies: 11
Views: 9782

Re: Modbus RTU maximum channel number

Thank you Dirk. When I configure for maximum 150 channels, the polling time adopted by RevPi for each channel is computed using the same logic used when I configure the standard master RTU? Then when you say "I don't think it's possible with the on-board tools we provide", you refer to my ...
by Fabrizio
25 Jul 2024, 18:16
Forum: Software
Topic: Modbus RTU maximum channel number
Replies: 11
Views: 9782

Modbus RTU maximum channel number

Hello. I need to configure the RevPI to acquire about 100 channels (more or less) read from 50-60 different sensors. Is it possible using a RevPI compact? If yes, shall I have any limitation on configured polling time or any other drawback? At the moment, I'm successfully using RevPI compact to acqu...