Page 44 Installation 90030500B
2. Fit the DB-25 connector to the modem. If your modem does not have a DB-25
connector, you will also have to obtain an adapter.
3. Fit the RJ-11 or RJ-45 plug to PortServer II. If you use an RJ-11 plug, ensure that
you center it on the jack.
ALTPIN
PortServer II includes a feature called ALTPIN that allows you to use 8 pin RJ-45 to
DB-25 adapters. ALTPIN swaps pins 2 and 10, making DCD available on pin 1 of an
8 pin RJ-45 connector. If you use ALTPIN, you must also configure the PortServer II
port with the command
set flow altpin
(see the
Command Reference Guide
for
details).
The cable wiring for ALTPIN is shown below:
Figure 17 ALTPIN cable
Note:
Digi International’s software can use the DSR signal in modem control appli-
cations. If your modem has auto-answer capability, you do not require the
Ring Indicator.
RJ-45 (8 pin) DB-25 Male
DCD 1 8 DCD
RTS 2 4 RTS
GND 3 1 GND
TxD 4 2 TxD
RxD 5 3 RxD
SG 6 7 SG
CTS 7 5 CTS
DTR 8 20 DTR
=Cable
Shield
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