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Why did wind sensor canot received the data via modbus serial port.
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All I see is Modbus messages going out and no responses coming back.
I would put another serial port on the end of the Modbus network and use a Modbus or serial sniffer program to watch the actual traffic on the network. Also you should ideally be using an serial adapter with RX / TX lights, can you confirm that the TX light flashes when the read command is given.
Joel.
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yes,When I click" read data "button and the usb(virual com port) adapter will flashes.but no data return and display"No response from slave 1".
Attachment: download link
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In one of your other threads (good luck finding it) I pointed out that you need to actually change the weather station to Modbus mode before you can read data using Modbus. Have you definitely done that?
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yes.I am sure now the wind sensor mode is modbus mode. and I can received the data from modbus scan software. But mango is not ok.
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@edmond said:
I can received the data from modbus scan software. But mango is not ok.
Show me where you are receiving the modbus data over serial using Modscan?
@jeremyh said:
@edmond said:
and can received data use modscan32 software.
Modscan doesn't receive any data..
Your equipment is not set up correctly
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as show in the attachment . I use other device via modbus ip to received data .
and display mango and modbus scan software as below.
Attachment: download link
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now I modify the connection to rs 485 .
and I test againdisplay "argument type mismatch"
many data 32 bit float.and mango have no this option.
Attachment: download link
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in wind sensor side ,have two type:rs422 or rs485,
before the connection always is rs 422, and I change a adapter to rs485 to test to see have any changing.
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and I test serval times.
and display"Exception from modbus master:CRC mismatch:given=1536,calc=8432"
Attachment: download link
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as your attachment, the modscan32 don't receive any value?don't you know what's mean valid slave responses:0?
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if in mango,
What do this mean "nd I test serval times.and display"Exception from modbus master:CRC mismatch:given=1536,calc=8432"
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This means that you got a response but the CRC did not match so the message was discarded.
A CRC of 1536 was given but the calculated CRC was 8432. This indicated that the message might have been corrupted.
If you don't know what a CRC is then you should do some research on the Modbus spec and will probably clear that up.
Joel.
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yes,I change to wind sensor adapter from rs 422 to rs485 adapter,and display above the message."exception from modbus master:CRC mismatch:given=1536,calc=8432"
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How to setting can display normal value.
will not display"Exception from modbus master:CRC mismatch:given=1536,calc=8432"
BR
Attachment: download link
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I don't think that's a question that anyone here can answer. It could be noise on your network or something else.
Joel.
