[R-390] Re: OT

[Cecil Acuff]

I build my own cables for just such situations at work, out of stuff Radio Shack never sold.  AMP DB9 and 25 shells and MIL spec pins and the special crimp tool that is used with them.  Same with some DB9 to RJ-45 carrying serial data.  Nice part is I get just the length I need...no coiling up the extra and having to find somewhere to dress it...

Cecil...


  ----- Original Message ----- 
  From: Tisha Hayes 
  To: r-390 at mailman.qth.net 
  Sent: Friday, January 02, 2009 10:16 PM
  Subject: [R-390] Re: OT


  "Hummm... I can not think of a time in 20 + years of being in this wonderful communications business of EVER going to Radio Shack for a part for any system."

  ---

  How about when the factory should have shipped you a DB-9 to DB-25 cable but where not all of the lines are terminated at the DB-9? I work with a radio product that uses pin 9 of a serial connection in a non-standard fashion (it is a 0-5 volt analog level representing received signal level). If I terminate the radio with a straight-up DB-9 to DB-25 connection I end up blowing up the radio.

  Or another radio that uses a DB-25 connection for serial data but uses the DSR/DTR lines as a secondary data port to program the radio. With a straight up DB-25 the DSR/DTR transitions from the host causes the programming in the radio to be corrupted.

  These are just two examples and are caused by manufacturers not following industry standards for what an EIA port should do. This should not be surprising to R-390A owners, look at the freaky MB connections on the coax cables connecting the modules together.



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