Siemens eWON4002 - Manual (Page 17)

eWON4002™
Installation Guide
page 14 of 35
ver 2.04
Note: the 3 switch configurations shown in the table above are the only configurations giving
satisfactory results.
Warning: The switch 2 is reserved and must stay OFF. Note that the switches 3 & 4 need to have the
same position (both ON or both OFF). When they are ON, this connects the internal
polarisation (typ 680 Ohms) and termination (typ 120 Ohms) resistors. This configuration
applies only to RS4xx lines conforming to good practices.
5.4.2 Serial port #2
Positions Mode
RS232
RS422, RS485
WITHOUT polarisation and termination resistors
RS422, RS485
WITH polarisation and termination resistors
Table 10: Serial mode configuration switches
Specification Value
Physical mode Full RS232
Normal isolation NOT ISOLATED
Pinout connector See label and appendix ( Relays output on page 30 )
Termination/polarization None
Table 11: Serial port 2 specification
OFF
ON
OFF
ON
OFF
ON