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Receive unicode/ascii strings from devices

Solved913 views19th February 2024
1
Hideyuki Imaida [DevOps Advocate]447 19th February 2024 0 Comments

I'm creating a 'smart-serial' connector for the device that sends ascii/unicode string.
Without options="unicode" type, they can received by the following definitions.
(Of course, I can't display unicode string correctly.)

[Parameter] <Param id="xxx">
<Name>MsgText</Name>
<Description>MSG TEXT</Description>
<Type>read</Type>
<Interprete>
<RawType>other</RawType>
<Type>string</Type>
<LengthType>next param</LengthType>
</Interprete>
</Param>

[QAction] string sText = Convert.ToString( protocol.GetParameter( xxx ) );

But with options="unicode" type, only unicode string can be received and no ascii string received.
How to define parameter for receiving both unicode/ascii strings correctly?

Hideyuki Imaida [DevOps Advocate] Selected answer as best 19th February 2024

2 Answers

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2
Tom Waterbley [SLC] [DevOps Catalyst]8.89K Posted 19th February 2024 4 Comments

Hi Hideyuki,

As Edib already mentioned, ascii is a subset of unicode so you should be able to receive it in the same parameter. Strings are being terminated by a 0x00 byte though, so maybe check if that character is not being sent by the device.

Another thing I wanted to mention is that when the protocol is unicode, the commands are also being sent to the device as unicode instead of ascii. You can override that on command level using the following attribute: https://docs.dataminer.services/develop/schemadoc/Protocol/Protocol.Commands.Command-ascii.html. Maybe the device doesn't recognise the command anymore after changing the protocol to unicode, and sends back a much shorter response now.

Tom Waterbley [SLC] [DevOps Catalyst] Posted new comment 19th February 2024
Hideyuki Imaida [DevOps Advocate] commented 19th February 2024

Hi Tom,
Thank you for the comments.
As I commented below, this device send UTF16LE that includes 0x00.
ex) “ab” char in UTF16LE is 0x61 0x00 0x62 0x00 and these are handled correctly with unicode option.

This connector acts as server and only receiving packets.
I think ‘ascii’ option is not available on response nodes.

Tom Waterbley [SLC] [DevOps Catalyst] commented 19th February 2024

Are you processing the data in a QAction? If that’s the case you could use the GetData() method to retrieve the raw unprocessed bytes from the parameter. Then you can do the desired conversion yourself. More information about the GetData method can be found here: https://docs.dataminer.services/develop/api/types/Skyline.DataMiner.Scripting.SLProtocol.GetData.html.

Hideyuki Imaida [DevOps Advocate] commented 19th February 2024

Hi Tom,
Thank you for the prompt response.
GetData() solved all the issues!
Now I can get both unicode/ascii string correctly by converting from byte array.

Tom Waterbley [SLC] [DevOps Catalyst] commented 19th February 2024

You’re welcome! I’m glad to hear that it’s solved now.

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