Re: streamDevice configuration issues with serial ports

[Michael Davidsaver via Tech-talk <tech-talk at aps.anl.gov>]

On 10/28/24 18:26, LONG FENG via Tech-talk wrote:
> Hi all,
> I have a sensor that communicates via RS485 with the Modbus RTU protocol. I want to use streamDevice
I would recommend investigating the dedicated modbus driver.

https://urldefense.us/v3/__https://github.com/epics-modules/modbus__;!!G_uCfscf7eWS!c4aIWok1tNUpdvoK687_GbGUCAbx6C1QeCs-S8lpaB_ezoWQZwEjMofav56BrZ-IOIyZ5jrM53AfDHb1aGIp4Bo3OQ$ 

> to read the sensor values, but I've found that there is no data transmission between the system and the sensor, and the following issues have occurred：
>
> /epics> 2024/10/28 21:00:05.370941 SI Sensor:Data: No reply within 10000 ms to "<01><04><00><00><00><06>p<08><0d><0a>"
> 2024/10/28 21:00:20.484243 SI Sensor:Data: No reply within 10000 ms to "<01><04><00><00><00><06>p<08><0d><0a>"
> 2024/10/28 21:00:35.322913 SI Sensor:Data: No reply within 10000 ms to "<01><04><00><00><00><06>p<08><0d><0a>"
> 2024/10/28 21:00:50.427348 SI Sensor:Data: No reply within 10000 ms to "<01><04><00><00><00><06>p<08><0d><0a>"
> /
>
>      My protocol(RS485Test.proto) file is written like this：
> /
> /
> /Terminator = CR LF;
> InTerminator = CR LF;
> ReplyTimeout = 10000;
> ReadTimeout = 10000;
>
> getData
> {
>    out "\x01\x04\x00\x00\x00\x06\x70\x08";
>    in "%r";
> }
> /
>      Record(RS485Test.db)：
>
> /record(ai, "Sensor:Data")
> {
>      field(DTYP, "stream")
>      field(INP, "@RS485Test.proto getData SI")
>      field(SCAN, "5 second")
> }
> /
> /
> /
>      IOC st.cmd:
> /
> /
> /#!../../bin/linux-x86_64/dataProcessing
>
> < envPaths/
> /
> dbLoadDatabase("../../dbd/dataProcessing.dbd",0,0)
> dataProcessing_registerRecordDeviceDriver pdbbase
> epicsEnvSet ("STREAM_PROTOCOL_PATH", "/home/training/examples/dataProcessingApp/Db")
>
>
> drvAsynSerialPortConfigure("SI", "/dev/ttyS3")
> asynSetOption("SI", 0, "baud", "9600")
> asynSetOption("SI", 0, "bits", "8")
> asynSetOption("SI", 0, "parity", "none")
> asynSetOption("SI", 0, "stop", "1")
> asynSetOption("SI", 0, "clocal", "Y")
> asynSetOption("SI", 0, "crtscts", "N")
>
> ## Load record instances
> dbLoadRecords("../../db/RS485Test.db")
>
> iocInit()/
>
>      Is there anything wrong with these?