Re: Data from a serial port

[Johann Klammer <klammerj@a1.net>]

On 09/28/2014 05:30 AM, 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
>
>
> TIA
>
> Ethan
> --
>
> 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.
>
> Hope this helps.
>
> TIA
>
> Ethan
use stty to configure the port.
man stty
stty 9600 cs7 -parodd -cstopb
(but there's more... handshake, newlines...)