MAN-00112 R 2.0 - EasyGrid Base User Guide
18
4.12 Connection – RS-485 / RS-422
A RS-485 / RS-422 serial port is provided on the EasyGrid Base.
It can be used to connect the EasyGrid Base to any RS-485 or RS-422 communication bus.
It also allows multiple EasyGrid Base to be link together off the same communication bus.
The physical port is accessible using the dedicated terminal block.
The pin layout is the following:
LABEL
MODE
RS-422
RS-485
B+
RX+
DATA+
A-
RX-
DATA-
B’+
TX+
N/A
A’-
TX-
N/A
GND GROUND GROUND
A set of dip switches is used to configure the port. They are located at the left of the terminal block.
*DIP switches positioned towards the
TOP are at the ON position
.
*DIP switches positioned towards the
BOTTOM are at the OFF position
.
LABEL
DIP switch position
RS-485
RS-422
422 / 485 ON
OFF
422 / 485
ON
OFF
OFF / EOL ON
OFF
Adds 120
Ω
End of Line
Resistance
No
End of Line
Resistance
OFF
Pull Down ON
OFF
Adds 1k
Ω
Pull Down
Resistance
No
Pull Down
Resistance
OFF
Pull Up
ON
OFF
Adds 1k
Ω
Pull Up
Resistance
No
Pull Up
Resistance
OFF
