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Full Discussion: Writing to a Serial Port
Top Forums Web Development Writing to a Serial Port Post 302922231 by wisecracker on Thursday 23rd of October 2014 11:14:18 AM
Old 10-23-2014
Quote:
"Again what is connected to your serial port, NOT what you are trying to connect to?"
The scale.
So you have a scale local to you that you can see and physically connect to?

This would have to be connected to the serial port using a cable then? Yes?
(This was the answer I was looking for.)

Does the scale require a Null Modem Cable or an Extension type?
If it is an Extension type then connect to your serial port and use your loopback plug at the other end and try the earlier test again.

Assuming the scale has RS232 transfer; what are the serial parameters and can it be used in raw data transfer mode?
'stty' is probably your best means of changing /dev/ttyS0 transfer parameters.

Do fault diagnosis step by step.
 

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TTYSRV(8)						      System Manager's Manual							 TTYSRV(8)

NAME
ttysrv - connect to a serial port and log output SYNOPSIS
ttysrv [-o option] [-s sock] [-l log] -t tty [-b baud] [-p parity] [-w wordsize] [-i pidfile] DESCRIPTION
ttysrv is the backend for rconsole. It connects to the serial port, handles the log file and waits for connections from rconsole to view what's happening on the serial console. OPTIONS
-t tty Specify which device to connect to. -s sock The name of the socket to listen for connections from rconsole on. -o option Specify any ttyios options to open the port with. Currently only nolocal is supported. -l log The logfile to write to. If not set then no log is kept. -b baud Set the baud rate to talk to the port at. Defaults to 9600. -p parity Set the parity for the serial port. Defaults to none. -w wordsize Set the word size for the serial port. Defaults to 8 bits. -i pidfile The file to write the pid of ttysrv to. If not specified no such file is written. SEE ALSO
rconsole(1), remote-tty(1). AUTHOR
rtty was written by Paul Vixie <vixie@isc.org>. This manual page was written by Jonathan McDowell <noodles@earth.li> for the Debian project (but may be used by others). May 23, 2006 TTYSRV(8)
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