Re: Could someone please explain this?
- From: "Michael" <mqiqcqhqaqeqlqhqiqmqsq@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Wed, 30 Aug 2006 14:21:21 GMT
"vic" <news@xxxxxxxxxxxxx> wrote in message
news:44f594a8$0$17154$626a54ce@xxxxxxxxxxxxxxx
Michael wrote:
Hi,
I'm writing a program that interfaces with a device on the serial port
and in the documentation it says the folowing:
3.1.1. Header:Code.
The Header:Code combination is configured thus:
Header: 7 6 5 4 3 2 1 0
< Number of Dims> 1 F/A E/S
Where:
Number of Dims is a value between 0 and 22 identifying the number of dims
to be transmitted (22 is equivalent to 100%)
Bit 2 is always set to '1' to ensure that the interface is able to
maintain synchronization.
F/A defines whether the following byte is a function (1) or address (0).
E/S defines whether the following byte is an extended transmission (1) or
a standard transmission (0).
Could someone please explain what "Number of Dims is a value between 0
and 22 identifying the number of dims to be transmitted (22 is equivalent
to 100%)" means?
A link to the documentation:
http://www.marmitek.com/en/software/PROTOCOL.DOC (Bottom of page 2)
Thanks,
Michael
It means bits 7 through 4 form a 5-bit number to be interpreted as the
"dim" value. The value would be : (header & 0xF8) >> 3
There is probably some kind of linear interpolation where 22 means 100%
and 11 50%.
vic
Thanks Vic
.
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