Serial interface RS422/RS485 EL6021
Run LED 
Power contact
+24 V
Power contact 0 V
Top view 
Contact assembly 
extended temperature range
extended shock and vibration range 25g

EL6021 | Serial interface RS422/RS485

The EL6021 serial interface enables the connection of devices with RS422 or RS485 interface. These devices communicate with the automation device via the coupler. The active communication channel operates independently of the higher-level bus system in full or half duplex mode at up to 115.2 kbaud. The transmission of differential signals according to RS422 guarantees high immunity to interference through electrically isolated signals.

In conjunction with the TwinCAT Virtual Serial COM Driver (see TwinCAT Supplements – Communication) the EL6021 can be used as a normal Windows COM interface.

Technical data EL6021 | ES6021
Technology terminal contact
Data transfer channels TxD and RxD, full/half duplex
Data transfer rates 2400…115,200 baud; default: 9600 baud, 8 data bits, no parity and one stop bit
Bit transfer with differential signal
Line impedance 120 Ω
Cable length approx. 1000 m twisted pair
Interfaces 1 x RS422/RS485
Providing external supply
Power supply via the E-bus
Electrical isolation 500 V (E-bus/signal voltage)
Data buffer 864 bytes receive buffer, 128 bytes transmit buffer
Bit width in the process image 22 x 8 bit input, 22 x 8 bit output, 16 bit control, 16 bit status
Configuration no address setting, configuration via PLC
Current consumption E-bus typ. 170 mA
Weight approx. 55 g
Operating/storage temperature -25…+60 °C/-40…+85 °C
Relative humidity 95 %, no condensation
Vibration/shock resistance conforms to EN 60068-2-6/EN 60068-2-27
EMC immunity/emission conforms to EN 61000-6-2/EN 61000-6-4
Protect. class/installation pos. IP 20/variable
Pluggable wiring for all ESxxxx terminals
Approvals CE, UL, Ex, IECEx
Special terminals
EL6021-0021 RS422/485 line device
TS6360 license for using the TwinCAT Virtual Serial COM Driver for Windows and Windows CE platforms
RS485 For further RS485 products please see the system overview.