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EIA-232 Modem Cables RJ-45 10-pin to DB-9

The wiring diagram for an RJ-45 10-pin to DB-9 modem cable is shown in Table 1. 

Table 1:  EIA-232 RJ-45 10-pin to DB-9 modem cable

From RJ-45 Signal Direction Signal To DB-9
10 DCD DCD 1
6 RxD RxD 2
5 TxD TxD 3
9 DTR DTR 4
7 SG SG 5
2 DSR DSR 6
3 RTS RTS 7
8 CTS CTS 8
1 RI RI 9
4 GND GND Shell
* Arrows indicate which direction the signal is flowing

These cables can also be purchased from Digi (See part numbers below).

  • 2' RJ-45 10-pin to DB-9 Pin   - Part #76000239

  • 4' RJ-45 10-ping to DB-9 Pin - Part #76000240

NOTES:

  • Altpin should be turned off when using this cable.
  • This cable utilizes the CTS signal of the modem for hardware flow control (RTS/CTS).
  • EIA-232 cables cannot exceed 2500pF.  For information about calculating capacitance of your cable, click here.
  • For information regarding the EIA-232/EIA-422/EIA485 specifications, click here.

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