Specifications

Appendix C. Serial Port Pin Outs

C-3

TABLE C-3. Standard Null Modem

Cable or Adapter Pin Connections*

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.