Home > bash scripting, Solaris, Trouble-Shooting > Sending data to serial port simultaneusly using jpnevulator

Sending data to serial port simultaneusly using jpnevulator

This solution comes when we facing trouble on solaris10 at remote site, whenever the machine read data from GPS using usb2serial cable, core-dump is always happen.

Before we go to the site (medan) we must simulate & solve problem at our office.

Laptop CQ-42

Hardware configuration, from left to right :

  1. Laptop : my work place where the script reside
  2. usb2serial merk ATEN (connected to my laptop)
  3. Kabel NULL Modem : serial cable with specific configuration, for communicate DTE (data terminal equipment)
  4. usb2serial merk ATEN (tersambung ke Sun Blade 1500)

Why use my laptop? because office GPS is not completely installed (no power supply found), then my computer act as GPS simulator to feed (time) data to server.
Why use usb2serial cable? because my laptop doesn’t have serial port, and all server’s serial port used by another existing real-time application.

GPS data format :      (STX)R:12:34:56(CR)(LF)D+000.10(CR)(LF)F:50.1(CR)(LF)(ETX)
(STX) : non-printable character, Start of TeXt
R:12:34:56 : GPS time
(CR)(LF)  : non-printable character, Carriage Return Line Feed = ENTER
D+000.01 : different time with system (server) time
F:50.1 : real time electrical frequency
(ETX) : non-printable character, End of TeXt

Troubleshoot process

  1. Install jpnevulator to my linux box to send/read/sniff data from/to serial port.
  2. Create Shell script
  3. Execute the script

Thanks to

Mr. Fredy S : Idea
Mr. Ory : Troubleshooter
Me : shell script lover 😀

Reference

Null modem
jpnevulator
Advanced Bash-Scripting Guide

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  1. 25 April 2012 at 6:42 am

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