
Appendix C. Serial Port Pin Outs
C-3
TABLE C-3. Standard Null Modem
Cable or Adapter Pin Connections*
DB9
DB9
pin 1 & 6 ---------- pin 4
pin 2 ---------- pin 3
pin 3 ---------- pin 2
pin 4 ---------- pin 1 & pin 6
pin 5 ---------- pin 5
pin 7 ---------- pin 8
pin 8 ---------- pin 7
pin 9 XXXXX
pin 9
(Most null modems
have NO connection)
* If the null modem cable does not connect pin 9 to pin 9, then the modem will
need to be configured to output a RING (or other characters previous to the
DTR being asserted) on the modem’s TX line to wake the datalogger and
activate the DTR line or enable the modem.
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