RS-232 D-9 Connection for data transfer

Discussion in 'General Electronics Chat' started by ahfa, Oct 17, 2014.

  1. ahfa

    Thread Starter New Member

    Jun 24, 2014
    3
    0
    Dear all,

    I am trying to make data transfer cable for sound level meter (LArson Davis 870B). The pin put they have given in manual are attached. I need to know which pins to connect. I am sure that 8 and 9 are not relevant.


    Thanks help will be much appreciated.
     
  2. Papabravo

    Expert

    Feb 24, 2006
    10,140
    1,790
    2,3, and 7
     
  3. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,539
    2,369
    That is non standard RS232 DB9 pin out, generally using 3 wire transmission, the handshake is jumpered, but the pins do not relate to the standard.
    For null modem where 2,3 & 5 (gnd) is used and 1-4-6 and 7-8 would be jumpered?
    For DB25 it would be transmission 2,3 & 7 and 4-5 and 6-8-20 jumpered.
    But the pin designations in this case cannot apply. Unless 4-5-6 H.S. are jumpered?
    Max.
     
  4. JoeJester

    AAC Fanatic!

    Apr 26, 2005
    3,373
    1,159
    Doesn't Larson Davis still support that sound meter?
     
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