Chapter 5
Specifications of communication & I/Os Interfaces
5.10. Configurable serial port
Specification Value
Physical modes (configurable)
RS232/RS485/RS422
Isolation
Not isolated
Pin-out connector
See 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)
Position Mode
RS232
RS422, RS485
WITHOUT polarization and termination resistor
RS422, RS485
WITH polarization and termination resistor
- Note -
The 3 switch configurations shown here above are the sole configurations giving satisfactory results.
That switch 3 & 4 need to have the same position (both ON or both OFF). When they are ON, it
connects the internal polarization (typ 680 Ohms) and termination (typ 120 Ohms) resistors. This
configuration applies only to RS485/RS422 lines conforming to good practices.
- WARNING -
The switch 2 is reserved and must stay OFF.
Page 20 / 36 eWON 2005CD | IG 001
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