CGU 04i DESCRIPTION
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for product Expansion port RS485 – RS422
Expansion port RS485-422
RS485
RS422
Power supply
External
+10 .. +30 V
Internal
....
Supply power
Max. 1 W
Supply current
Max. 4 mA
Environment
Operating temperature
-20 .. +55 C
Storage temperature
-20 .. +85 C
Standards
Emission
EN 55022/B
Immunity
ETS 300 342
Safety
EN 60950
RS485 specifications
(EN 1434)
Max. devices (each 1,5 mA)
256
Max. bit rate
38400 bps
Short circuit strength
Permanent
Max. total cable length
(300Bd, 200nF/km)
1200 m
External or internal power supply of module Expansion port RS485/RS422 can be
made by wiring jumpers J2 and J3 on this module. If external power supply of the module is
required, jumpers J2 and J3 must be connected to pins 2 - 3. Internal power supply is made by
connecting pins 1 - 2 with jumpers J2 and J3.
Interface behavior of module Expansion port RS485/RS422 can be made by wiring
jumpers J4, J5 and J6 on this module. If RS485 is required, jumpers J4 and J5 must be
connected and jumper J6 disconnected. If RS422 is required, jumpers J4 and J5 must be
disconnected and jumper J6 connected.
Jumper placement can be seen in the picture below (module Expansion port
RS485/RS422 from TOP layer). We recommend that internal power supply is only chosen
in the event that it is not possible to ensure external power supply. If internal power supply is
chosen, converter RS485/RS422 is not galvanic separated.
The jumper circuitry for internal supply
The jumper circuitry for external supply
Jumper J2
Jumper J3
Jumper J2
Jumper J3
