[rapidscadaaks]

Hi

I tried creating a calculated channel with following formula and Rapid Scada stopped working:

if(hour() >= 8 && hour() < 20, 1, 0)

Please advise

Thanks

[rapidscadaaks]

Thanks for the tip. Please advise how to use data of 2 channels for returning 1 or 0

Many thanks in advance

[rapidscadaaks]

This scenario is better. Please advise how to create a channel that can be 0 or 1 depending on time.

Thanks in advance

[rapidscadaaks]

Hi
Manufacturer (Waveshare) is not responding to the issue.
I have checked connecting the device directly to the PC using serial port and values are not received for the Input Channels. The issue therefore is not Rapidscada related.
I am therefore using alternate product and results are fine.
Thank you for the assistance

[rapidscadaaks]

Hi
I tried polling one register from 0 using Holding Registers and there was no response from the unit

I have created a support ticket with the manufacturer and await their response.

In the meantime, please suggest software for testing purposes for sending command to the unit and getting response.

[rapidscadaaks]

Hi
Awaiting guidance for resolution.
Thanks

[rapidscadaaks]

Yes. This matches with the documentation.

[rapidscadaaks]

Hi
In 100% cases, Digital Input is failing

2025-07-23 18:10:48 Session with the device [47] Waveshare_Relay_Test
Request element group “Relays”
Send (8): 01 01 00 00 00 08 3D CC
Receive (2/2): 01 01
Receive (4/4): 01 00 51 88
OK
Request element group “Digital Input”
Send (8): 01 02 00 00 00 08 79 CC
Receive (0/2):
Error: communication failed
Request element group “Digital Input”
Send (8): 01 02 00 00 00 08 79 CC
Receive (0/2):
Error: communication failed
Request element group “Digital Input”
Send (8): 01 02 00 00 00 08 79 CC
Receive (0/2):
Error: communication failed

2025-07-23 18:10:52 Session with the device [47] Waveshare_Relay_Test
Request element group “Relays”
Send (8): 01 01 00 00 00 08 3D CC
Receive (2/2): 01 01
Receive (4/4): 01 00 51 88
OK
Request element group “Digital Input”
Send (8): 01 02 00 00 00 08 79 CC
Receive (0/2):
Error: communication failed
Request element group “Digital Input”
Send (8): 01 02 00 00 00 08 79 CC
Receive (0/2):
Error: communication failed
Request element group “Digital Input”
Send (8): 01 02 00 00 00 08 79 CC
Receive (0/2):
Error: communication failed

2025-07-23 18:10:56 Session with the device [47] Waveshare_Relay_Test
Request element group “Relays”
Send (8): 01 01 00 00 00 08 3D CC
Receive (2/2): 01 01
Receive (4/4): 01 00 51 88
OK
Request element group “Digital Input”
Send (8): 01 02 00 00 00 08 79 CC
Receive (0/2):
Error: communication failed
Request element group “Digital Input”
Send (8): 01 02 00 00 00 08 79 CC
Receive (0/2):
Error: communication failed
Request element group “Digital Input”
Send (8): 01 02 00 00 00 08 79 CC
Receive (0/2):
Error: communication failed

2025-07-23 18:11:00 Session with the device [47] Waveshare_Relay_Test
Request element group “Relays”
Send (8): 01 01 00 00 00 08 3D CC
Receive (2/2): 01 01
Receive (4/4): 01 00 51 88
OK
Request element group “Digital Input”
Send (8): 01 02 00 00 00 08 79 CC
Receive (0/2):
Error: communication failed
Request element group “Digital Input”
Send (8): 01 02 00 00 00 08 79 CC
Receive (0/2):
Error: communication failed
Request element group “Digital Input”
Send (8): 01 02 00 00 00 08 79 CC
Receive (0/2):
Error: communication failed

2025-07-23 18:11:04 Session with the device [47] Waveshare_Relay_Test
Request element group “Relays”
Send (8): 01 01 00 00 00 08 3D CC
Receive (2/2): 01 01
Receive (4/4): 01 00 51 88
OK

[rapidscadaaks]

https://drive.google.com/drive/folders/1vlIcl4xIIcAInInh3mefr4DbJkR56pO0?usp=sharing

I hope the link is fine

Thanks

[rapidscadaaks]

Hi
I have the screenshots ready. Please advise how to attach as I do not seem to find option for uploading file

[rapidscadaaks]

Details & manual of the device:

https://www.waveshare.com/wiki/Modbus_RTU_Relay_(D)

[rapidscadaaks]

Hi
I have a Waveshare Modbus RTU(D) Relay with has 8 channels each of Digital Inputs and Outputs.
I am able to use to digital outputs using commands and also check their status.

I am however not able to read status of Digital Inputs. Waveshare manual gives following parameters for reading input status:
Modbus Function Code 0x02
Address (HEX) 1×0000 …… 1×0007 for the 8 channels

I have tried various combinations and have not succeeded

I will be grateful for assistance

[rapidscadaaks]

Many thanks. This works

[rapidscadaaks]

Hi Mikhail

Please let me know what Command should be sent by the ACM.

Thanks once again

[rapidscadaaks]

Hi

Please guide for Option 2 for resetting Channel 1437 which is a Calculated Channel since I already have the additional module.

In the ACM, I can create a Time Trigger but need help for further steps i.e.

1. Do I need to make a new Input/Output Channel 1438 which has ResetChannels(1437) in Output Formula? All other fields i.e. Device, Tag, etc. will be empty

2. In the ACM what command to send to 1438?

Please do pardon me for my basic questions as this is quite new to me.

Looking forward to expeditious help.

Thanks

[Author]

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