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Tipps Serial Device Settings To Switch Off Every Hidden Manipulation

Introduction

In the case of the Keithley 2000 Digital Voltmeter, we saw that a Windows device could easily communicate via the RS-232 Interface using SCPI commands. Linux systems on the other side, reacted to commands input but weren't able to read anything back. Fiddling around with the stty settings, M.Traxler, GSI found / tried / out exactly the same settings as used for the HadCon2 devices.

Solution

$> stty -F /dev/ttySx -opost -onlcr -isig -icanon -iexten -echo -echoe -echok -echoctl -echoke 19200

    • Output settings:
      -opost
      do not post-process output
      -onlcr
      do not translate newline to carriage return-newline
    • Local settings:
      -isig
      do not enable interrupt, quit, and suspend special characters
      -icanon
      do not enable erase, kill, werase, and rprnt special characters
      -iexten
      do not enable non-POSIX special characters
      -echo
      do not echo input characters
      -echoe
      do not echo erase characters as backspace-space-backspace
      -echok
      do not echo a newline after a kill character
      -echoctl
      do not echo control characters in hat notation ('^c')
      -echoke
      kill all line by obeying the echoctl and echok setting
      19200
      sets the speed to 19200 Bit/s

    Summarizing the settings prevent any additional manipulation of input or output.


-- PeterZumbruch - 2017-11-30
-- PeterZumbruch - 2017-11-30

This topic: Epics > WebHome > DevelopersCorner > LinuxTricksTips > TippsSerialDeviceSettingsToSwitchOffEveryHiddenManipulation
Topic revision: 2017-11-30, PeterZumbruch
 
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