Tcl: How to communicate serial port remotely Post: 302466587

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Top Forums Shell Programming and Scripting Tcl: How to communicate serial port remotely Post 302466587 by allenxiao7 on Tuesday 26th of October 2010 06:21:08 PM

10-26-2010

Registered User

Tcl: How to communicate serial port remotely

Hi all:

i wanna automate a test written in Tcl, but stuck in serial communication.

I had 2 PC, one is my local Windows machine, the other one is my test Linux server. The Linux box is connected to the test board via serial port. So I wanna send commands and get output through the serial port.

So i wrote a Tcl script, and wanna call the scripts in Windows, remotely connect to the Linux server and talk to the test device via serial port. It failed so far. I used 'Open' in tcl to create a serial connection in Linux.

Code:

 ex. set fh [open /dev/ttyS0 RDWR]

what I learn the reasons why this may not work are that (in my option):

first, fh is a file descriptor if one open a file (in linux, all devices represent a file), so u cant monitor a live test, instead read a file line by line after a numbers of seconds. I doubt there is no eof in /dev/ttyS0, which means even u can read from it, if no incoming output, u can still read an empty string without issuing an error.

second, since i remotely connect to linux box from window pc, tcl interpreter is confused by which serial port i was trying to open, (windows? or Linux? I am using a virtual Linux in Windows to call the script, connect to the Linux sever, trying to communicate the device connected to there.)

I hope everyone understand my situation, and my purposes now.

I really appreciate all your suggestion regarding how to remotely commnucate serial port in Tcl.

allenxiao7

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LEARN ABOUT OSF1

dc

dc(7)							 Miscellaneous Information Manual						     dc(7)

NAME

       dc - serial line/mouse/keyboard

SYNOPSIS

       controller   dc0   at ibus0   slot 0   vector dcintr

DESCRIPTION

       The  dc	serial	line controller provides DECstation 2100, DECstation 3100, DECstation 5000, and DECstation 5100 computer systems with key-
       board, mouse, and serial communications interfaces. The serial communications interfaces on the DECstation 2100 and DECstation 3100 provide
       partial	modem  control.  The  serial communications interfaces on the DECstation 5000 provide full modem control.  The device special file
       /dev/tty01 on a DECstation 5100 provides full modem control, while the remaining ports provide no modem control at all.	All serial  commu-
       nications interfaces operate at baud rates from B50 to B9600, excluding B200.

       The  dc	ports  are  used as follows: Usage Graphics device keyboard at 4800 BPS Mouse or tablet at 4800 BPS Communications port 1 (w/modem
       control)/local terminal Communications port 2 (w/modem control)/local terminal

       On all systems except the DECstation 5100, serial port 2 is used for the system console port in server (that is,  non-graphics)	configura-
       tions.  On DECstation 5100s, the serial port labeled 3 on the back of the system is always the system console port.  The serial system con-
       sole port always operates at 9600 BPS, 8-bits, no parity; modem control is not supported.

RESTRICTIONS

       Data communications equipment attached to the console serial port in server configurations must be set to 9600 BPS, 8-bits, no parity.  The
       scc driver enforces this restriction.

FILES

       console terminal local terminal local terminal local terminal (DECstation 5100 only)

RELATED INFORMATION

       console(7), devio(7), tty(7), MAKEDEV(8) delim off

																	     dc(7)