Re: Data from a serial port
On Sat, Sep 27, 2014 at 11:26:48PM -0400, Ethan Rosenberg, PhD wrote:
> Dear List -
>
> I have an Avery Berkel POS [Point Of Sale] scale which I wish to
> integrate into a POS system. The output is sent to a RS232 port. I
> do not know how to extract the data.
>
> Here is what I have about the RS232 port:
>
> ethan@meow:~$ dmesg | grep tty
> [ 0.000000] console [tty0] enabled
> [ 0.383854] 00:07: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
> [ 0.404352] 0000:00:03.3: ttyS1 at I/O 0x1c90 (irq = 17, base_baud = 115200) is a 16550A
>
>
> root@meow:/home/ethan# setserial -g /dev/ttyS[0123]
> /dev/ttyS0, UART: 16550A, Port: 0x03f8, IRQ: 4
> /dev/ttyS1, UART: 16550A, Port: 0x1c90, IRQ: 17
> /dev/ttyS2, UART: unknown, Port: 0x03e8, IRQ: 4
> /dev/ttyS3, UART: unknown, Port: 0x02e8, IRQ: 3
>
>
> More info from the manual --
>
> 9600 baud, 7 data bits, even parity, 1 stop bit
>
> Transmits weight and scale status whenever ASCII 'W'<CR> is sent by the POS terminal.
Well, one option would be to install minicom (apt-get will find
it for you), set your default serial port to /dev/ttyS0, set it
at 9600,7,e,1. Then plug it in and see if tapping W gets you
a response.
/dev/ttyS0 will look just like a file, if you're writing a
program, and you can read from it and write to it just like any
other file.
-dsr-
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