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Chapter 9 Pinout reference 69

Digi One, PortServer TS, and Multi-Port Serial Cards RJ-45 to DB-9M modem adapter

From

RJ-45

Signal Direction Signal To

DB-9

DCD 1 1 DCD

DSR 6

2 RTS RTS 7

3 Ground Ground Shell

4 TxD TxD 3

5 RxD RxD 2

6 SG SG 5

7 CTS CTS 8

8 DTR DTR 4

Pin 1 Pin 1

Female RJ-45 Male DB-9

8-pin

Cable Adapter not to scale

* Arrows indicate which direction the signal is flowing

Notes:

 All RJ45 cable adapters are 8-pin.

 When using this adapter with a modem or other applications that require DCD on pin 1, you must turn on altpin.

 If altpin is turned off, the hardware signal on pin 1 becomes DSR instead of DCD.

 This cable utilizes the CTS signal of the modem for hardware flow control (RTS/CTS).

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