Rj45 To Db9 - Black Box 16-Port Rackmount 10/100 Installation Manual

You can use a crimper block to connect both transmit and receive grounds from the RJ45
cable to the single signal ground on the DB25. The connector internally "splices" the two
wires together and provides one wire into the DB25 connector as shown below.
RJ45 Tx Return
RJ45 Rx Return
To splice the wires, cut off the end of the wire that does not extend through the connector
and insert both wires into the connector. Make sure that the wire that does not extend
through the connector is in as far as possible to ensure a solid connection. Make sure that
the wire that does extend through the connector extends far enough on the other side to be
inserted in to the DB25 connector. Carefully squeeze the connector using a pair of pliers to
make sure it is fully latched.

12.2.2 RJ45 to DB9

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Figure 12-5: Wire Splicer
Figure 12-6: RJ45-DTE DB9 Adapter
Sealed at this end
DB9 Signal Ground