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
cyclades-devices
cyclades-devices(5)cyclades-devices(5)NAME
cyclades-devices - tables for driving cyclades-serial-client
DESCRIPTION
The cyclades-devices file supplies all mapping between Unix device files (/dev/*) and the addresses of serial ports of Cyclades Terminal
Servers. It contains one entry for each serial port, with the following format:
device:rastype:rasname:physport:type:options
Note: A # character at beginning of line indicates a comment
The entry fields are:
devname
- A full pathname of the file that will be associated to the serial port. It must start with a "/dev/" preffix. Two naming schemes
may be used here: - devname does not exist, and will be linked to a free pseudo-tty. This is the default behavior of cyclades-ser-
cli. - devname is the name of a valid slave pseudo-tty. In this case, the '-t 1' option must be assigned in options field. (Note:
this option is not supported by this release).
rastype
- Terminal Server type: - prts, for Cyclades Pr302X/TS Terminal Servers. - path, for Cyclades PathRAS Terminal Server.
rasname
- Host Name or IP Address of the Terminal Server where the serial port resides.
physport
- Number of physical port in the Terminal Server. If treated as the IP address associated with this port, in a IP-based addressing
scheme.
type - Server type that will be contacted to handle the serial port: - rtelnet, for Remote Telnet Server - socket, for Socket Server
options
- Per-port specific options, passed to cyclades-ser-cli program.
EXAMPLES
1. Device on a PR3020/TS Terminal Server pr3k Port 1, accessed through /dev/ctty01 device file name, using telnet protocol (remote telnet
server)
/dev/ctty01:prts:pr3k:1:rtelnet:
2. The same device, but with an IP address pr3k_port1 associated to the serial port (IP-based port addressing)
/dev/ctty01:prts:pr3k_port1:0:rtelnet:
3. Device on a PathRAS Terminal Server pr3k Port 2, accessed through /dev/ctty02 device file name, using socket protocol (socket server)
/dev/ctty02:path:pr3k:2:socket:
FILES
/etc/cyclades-devices This file
SEE ALSO cyclades-serial-client(1), cyclades-ser-cli(1)cyclades-devices(5)
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.