Simple write() help

[andybdjuk]

Hi, Simple one I feel now i have worked out the correct CRC, if i put :-

\x06\x0A\x81\x00\x00\x00\xFF\xFF\x34\xCE

in the comm monitor I receive my data:-

Tx (20:29:45.762): \x06\x0A

\x81\x00\x00\x00\xFF\xFF\x34\xCE

Rx (20:29:45.800): \x81\x4B\x00\x06\x00\x00\x00\x40\x00\x00\x40\x00\x13\x02\x00\x01\x00\x00\x00\x00\x06\x05\x00\x02\x14\x00\x0C\x10\x1C\x01\x01\x01\x00\x00\x00\x00\x00\xFF\xFF\xFF\xFF\x00\xD2\x00\x00\x07\x15\x1C\x07\x07\x00\x15\x07\x1E\x11\x12\x00\x11\x15\x00\x11\x08\x00\x15\x0A

\x00\x10\x18\x00\x10\x18\x00\x10\x34\xF7

But when i try a quick sequence in a button

device.thermo.write(\x06\x0A\x81\x00\x00\x00\xFF\xFF\x34\xCE)

I have no luck, could you remind me of the correct syntax, i have looked at the manual........but...........umm

Thanks

Andy

[AzeoTech]

Backslash notation is for the monitor only. If you have a string of binary values like this, its easiest to use chra():

device.thermo.write(chra({0x06, 0x0a, 0x81, 0x00, 0x00, 0x00, 0xff, 0xff, 0x34, 0xce}))

[andybdjuk]

Can you help me out with the next bit and that is to read the response that comes back as per the example in the OP.

I only need to use the Nth byte of the string, put it in a channel so I can send the value to DaqConnect. I would like to do this every minute.

Sorry that these are basic questions

Andy

[AzeoTech]

I don't see a handy delimiter, so I'm guessing its fixed field: that the response is always a certain number of bytes. If so, do:

private string datain = device.mydevice.read(x)

where x is however many bytes you expect. You could also just do read(n) where n is the byte number you want, and then do purge() to clear out the rest (or do it right before the write())

Then do:

private data = asca(datain)

which is the opposite of chra() and will convert the response string into an array of numbers which you can easily extract the nth byte by using normal [] notation.

[andybdjuk]

That's fantastic. Thanks for your time and support, I had been reading the manual and experimenting but alas...

One other thing, I have my test channel sending a value to DaqConnect but it is Value[0] that is being sent & I need to send Value[28] and maybe at a later date others to DaqConnect from that channel.

So what i done was create a 2nd test channel and just addvalue(mychannel[28])and that works fine BUT is there a simpler way of doing it rather than having to set up another channel?

Thanks

Andy

[AzeoTech]

You can use the DAQConnect.addValue() function. I believe it takes two parameters, a string with the tag name, and the value.