eWON
2101CD™
Installation Guide
ver 1.6
page 20 of 34
5.7 Configurable serial port
The configuration of the physical serial mode is done by a set of 4
dip switches located on left side of the unit.
The settings of the switches are shown in the table below (note:
switch 1 is the right one).
Note: the switch configurations shown above are the only configurations giving satisfactory
results.
Warning: The switch 2 is reserved and must stay OFF.
Note that switch 3 & 4 need to have the same position (both ON or both OFF). When they
are ON, it connects the internal polarisation (typ 680 Ohms) and termination (typ 120
Ohms) resistors. This configuration applies only to RS485/RS422 lines conforming to
good practices.
Specification
Value
Physical modes (configurable)
RS232/RS485/RS422
Isolation
Not isolated
Pinout connector
See label and appendix (
Serial Port on page 31
)
Table 10: Serial port specification
Positions
Mode
RS232
RS422, RS485
WITHOUT polarisation and termination resistor
RS422, RS485
WITH polarisation and termination resistor
Table 11: Serial mode configuration switches
