Advantech ADAM-5511 Manual page 106

The ADAM-5090 module provides four RS-232 ports for communica-
tion with target devices. The ports are numbered 1 through 4. For
programming, the definition of port number depends on the slot
number and port number. For example, the second port on the ADAM-
5090 in slot 1 is defined to port 12 (refer to table 6.1).
This section tells you how to set the jumpers to configure your
ADAM-5090 module. There are four jumpers on the PC Board. User
can choose RI signal or 5V output for each port by setting these
jumpers (system default is RI signal).
The following figure shows the location of the jumpers:
LED
J1
5V Output
Port1 Port2
J2
RI Signal
(Default)
Port3 Port4
Jumper
J3 J4
+5V
RI