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Chapter 5 EIA-232: RJ-45 to DB-25 17

Digi RJ-45 connector pin assignments

10-pin RJ-45 plugs may be difficult to obtain in the retail market. Therefore,

most Digi device driver software incorporates an optional feature called

ALTPIN, which swaps the logical functions of DSR (Data Set Ready) with

DCD (Data Carrier Detect).

When ALTPIN is enabled, DCD becomes available on pin 1 of an 8-pin RJ-

45 connector (equivalent to pin 2 of a 10-pin connector).

Chapter 4

EIA-232: RJ-45 to DB-25

Signal Description DTE use Pin #

RI Ring Indicator Input 1

DSR (DCD

)

a.When ALTPIN is in effect.

Data Set Ready (Data Carrier Detect

) Input 2

RTS Request to Send Output 3

GND Chassis Ground N/A 4

TxD Transmitted Data Output 5

RxD Received Data Input 6

SG Signal Ground reference 7

CTS Clear to Send Input 8

DTR Data Terminal Ready Output 9

DCD (DSR

) Data Carrier Detect (Data Set Ready

) Input 10

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 147 148

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