4 Rockwell Automation Publication 2080-UM005E-EN-E - March 2018
Chapter 1 Hardware Overview
Embedded RS232/RS485 Serial Port Combo
The Micro820 controller supports an embedded non-isolated RS232/RS485
combo communications port. Only one port (RS232 or RS485) can work at any
given time. The baud rate of this port supports up to 38.4 K.
The communication port uses a 6-pin 3.5 mm terminal block with pin definition
shown in the following table.
The communication port (both RS232 and RS485) are non-isolated. The signal
ground of the port is not isolated to the logic ground of the controller.
The RS232 port supports connection to the Micro800 Remote LCD module
(2080-REMLCD).
Serial port cables should not exceed 3 m length.
RS232/RS485 Serial Port Pin Definition
Pin Definition RS485
Example
RS232
Example
1 RS485+ RS485+ (not used)
2 RS485- RS485- (not used)
3 GND GND GND
4 RS232 input (receiver) (not used) RxD
5 RS232 output (driver) (not used) TxD
6 GND GND GND
REMLCD to Micro820 Serial Port Terminal Block Wiring
REMLCD Serial Port
Terminal Block
Micro820 Serial Port
Terminal Block
Signal Pin
number
Pin
number
Signal
RS232 TX 1 <--------> 4 RX RS232
RS232 RX 2 <--------> 5 TX RS232
RS232 G 3 <--------> 6 G RS232
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