SPS communication on UART with PC

[Mohit2183]

we are facing a critical issue with communication with SPS30 WITH PC
we were testing sps30 by connecting with docklight.
we have used usb to serial converter to command the sps30.
pin 1 was connected to poer supply +5vdc ,
pin 5 was connected to 0vdc.
pin4 was left open for UART,
pin 2 was connected to Tx of master (PC),
pin 3 was connected to Rx of master (pc).
From docklight v2.3 we had set the com port , 115200, 8N1 communication settings.
we have placed command in format of Hex codes i.e.
start command
Tx: 7E 00 00 01 02 F9 7E ,
Rx REPLY: 7E 00 00 01 02 F9 7E ,
Tx: 7E 00 00 00 FF 7E,
Rx REPLY: x: 7E 00 00 00 FF 7E ,
Tx: 7E 00 03 00 FC 7E ,
Rx REPLY: 7E 00 03 00 FC 7E ,
Tx: 7E 00 D3 00 2C 7E,
Rx REPLY: 7E 00 D3 00 2C 7E .
OVER ALL FAN IS ALSO NOT ROTATING PHYSICALLY..
could you pls guide us why sps30 is not giving response to our commands.
how to proceed further with sps30

[paulvha]

hi At first sight I would say the responds is the same as the TX. Is there a loopback in Docklight set ? I don't know docklight, but had a quick look, not much time to deepdive. I see that directsend has an option for UDP loopback: When using a channel setting like UDP:LOCALHOST:10001 you effectively create a loopback, similar to a serial port loopback, where and all outgoing data is immediately received. Are you using that ? What happens if you remove connection from pin 2 or 3 from the SPS30? Are you still getting a responds ? Then I looked at the commands as documented in https://www.sensirion.com/fileadmin/user_upload/customers/sensirion/Dokumente/0_Datasheets/Particulate_Matter/Sensirion_PM_Sensors_SPS30_Datasheet.pdf 7E 00 00 01 02 F9 7E 7E Start 00 address 00 command 01 length 02 data F9 inverted checksum 7E STOP CMD command length data 0x00 Start measurement 02 01 03 0x01 Stop measurement 00 0x03 read measured value 00 0x80 read autoclean 01 00 0x80 write autoclean 05 00 XX XX XX XX )( X = time in seconds) 0x56 Start fancleaning 00 0xD0 read product info 01 YY ( 01 or 02 or 03) 0xD3 device reset 00 your commands : 7E 00 00 01 02 F9 7E : command is 00. Length must be 02 but is 01 missing the mandatory data, it will not start 7E 00 00 00 FF 7E : command is 00, Length must be 02 but is 00 missing the mandatory data, it will not start 7E 00 03 00 FC 7E : command is 03 , correct read measurement, but SPS30 has not started. Still I would have expected a different responds (loopback ?) 7E 00 D3 00 2C 7E : command is D3. correct reset but I would have expected a different responds (loopback ?) Check for loopback, but also check for the commands as documented in the datasheet. regards, Paul

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________________________________ Van: Mohit2183 <[email protected]> Verzonden: zaterdag 11 januari 2020 23:09 Aan: paulvha/SPS30_lora <[email protected]> CC: Subscribed <[email protected]> Onderwerp: [paulvha/SPS30_lora] SPS communication on UART with PC (#1) we are facing a critical issue with communication with SPS30 WITH PC we were testing sps30 by connecting with docklight. we have used usb to serial converter to command the sps30. pin 1 was connected to poer supply +5vdc , pin 5 was connected to 0vdc. pin4 was left open for UART, pin 2 was connected to Tx of master (PC), pin 3 was connected to Rx of master (pc). From docklight v2.3 we had set the com port , 115200, 8N1 communication settings. we have placed command in format of Hex codes i.e. start command Tx: 7E 00 00 01 02 F9 7E , Rx REPLY: 7E 00 00 01 02 F9 7E , Tx: 7E 00 00 00 FF 7E, Rx REPLY: x: 7E 00 00 00 FF 7E , Tx: 7E 00 03 00 FC 7E , Rx REPLY: 7E 00 03 00 FC 7E , Tx: 7E 00 D3 00 2C 7E, Rx REPLY: 7E 00 D3 00 2C 7E . OVER ALL FAN IS ALSO NOT ROTATING PHYSICALLY.. could you pls guide us why sps30 is not giving response to our commands. how to proceed further with sps30 — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub<https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fpaulvha%2FSPS30_lora%2Fissues%2F1%3Femail_source%3Dnotifications%26email_token%3DAD2GBPHUW2OLY3GRJREULX3Q5I7SBA5CNFSM4KFUHXPKYY3PNVWWK3TUL52HS4DFUVEXG43VMWVGG33NNVSW45C7NFSM4IFRHSWQ&data=02%7C01%7C%7C4efa03758a66413834c908d796e2f23a%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637143773773970413&sdata=kSoe5R1GdvD3ifKkz4pDfA7E%2FbVR7Yj31d19oZnHV6E%3D&reserved=0>, or unsubscribe<https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fnotifications%2Funsubscribe-auth%2FAD2GBPCVJU4F6WPQOVRNROTQ5I7SBANCNFSM4KFUHXPA&data=02%7C01%7C%7C4efa03758a66413834c908d796e2f23a%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637143773773970413&sdata=%2BuWmf7J0nZc5ZB99G%2Bhj1%2BVAybvZ8Uk2nBw64xpPIiA%3D&reserved=0>.