Ubuntu 9.04 Serial application to telnet to serial device
Hello!
I am working on an application which reads environmental instruments which have serial ports. The application requires a serial port to be present to talk to the device (i.e. /dev/ttyS0 ). In some instances the environmental devices will be 100's of yards away from the computer, so a serial cable becomes a liability. In these scenarios we would like to use a multi-port terminal server which serves up multiple serial connections via telnet.
I have almost solved the problem...but need some help finishing. DETAILS:
The configuration we have is:
Computer/Ubuntu 9.04 --> Ethernet ----> Telnet Based Serial Device Server --> Serial Device
I have run remserial and am able to interact with the serial device using socat or netcat from the terminal. However, SJINN as with as other serial port viewers are unable to connect to the generated pseudo serial port. I get an error about ioctrl.
DETAILED STEPS I FOLLWED:
1) Create a file in /dev called “remserial1” and chmod this to 777.
I can interact with the serial device as if I had a serial connection to it.
The Issue: When I use a normal serial viewer (in this case SJINN or Serial Port Terminal gtkterm) with gtkterm I get “Control signals read: Invalid argument”. With SJINN I get an error involving ioctrl.
I believe that it has to do with trying to read a pseudo terminal, but am at my wits end , any advice would be appreciated. Also, before linking netcat or socat examples, please remember that an application on the computer must speak with a serial port, which is then relayed over telnet and back to a serial device without buying some serial port redirector package.
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Discussion started by: Chalk-X
12 Replies
LEARN ABOUT DEBIAN
gammu-detect
GAMMU-DETECT(1) Gammu GAMMU-DETECT(1)NAME
gammu-detect - Gammu device detection
New in version 1.28.95.
SYNOPSIS
gammu-detect [OPTIONS]
DESCRIPTION
Script to detect available devices, which might be suitable for gammu.
Note This program lists all devices, which might be suitable, it does not do any probing on devices them self.
Currently it supports following devices:
o USB devices using udev
o Serial ports using udev
o Serial ports on Windows
o Bluetooth devices using Bluez
Note Supported devices depend on platform you are using and compiled in features. You can find out what is actually compiled in by run-
ning gammu-detect -v.
This program follows the usual GNU command line syntax, with long options starting with two dashes (--). A summary of options is included
below.
-h, --help
Show summary of options.
-d, --debug
Show debugging output for detecting devices.
-v, --version
Show version information and compiled in features.
-u, --no-udev
Disables scanning of udev.
-b, --no-bluez
Disables scanning using Bluez.
-w, --no-win32-serial
Disables scanning of Windows serial ports.
OUTPUT
The output of gammu-detect is configuration file for Gammu (see gammurc) with configuration section for every device which might be used
with gammu.
Note You can choose which section to use in gammu by gammu -s.
When invoked as gammu-detect -d, also all examined devices are listed as comments in the output.
EXAMPLE
; Configuration file generated by gammu-detect.
; Please check The Gammu Manual for more information.
[gammu]
device = /dev/ttyACM0
name = Nokia E52
connection = at
[gammu1]
device = /dev/ttyACM1
name = Nokia E52
connection = at
[gammu2]
device = /dev/ttyS0
name = Phone on serial port 0
connection = at
[gammu3]
device = /dev/ttyS1
name = Phone on serial port 1
connection = at
[gammu4]
device = /dev/ttyS2
name = Phone on serial port 2
connection = at
[gammu5]
device = /dev/ttyS3
name = Phone on serial port 3
connection = at
[gammu6]
device = 5C:57:C8:BB:BB:BB
name = Nokia E52
connection = bluephonet
AUTHOR
Michal iha <michal@cihar.com>
COPYRIGHT
2009-2012, Michal iha <michal@cihar.com>
1.31.90 February 24, 2012 GAMMU-DETECT(1)
10-08-2009
Ubuntu 9.04 Serial application to telnet to serial device
, any advice would be appreciated. Also, before linking netcat or socat examples, please remember that an application on the computer must speak with a serial port, which is then relayed over telnet and back to a serial device without buying some serial port redirector package.