PROGRAMMABLE DISPLAY WHA1 Advanced Model
4
2.3 Grounding
Use dedicated grounding:
・
make the grounding point as close as possible to the GT and keep the distance of the grounding wire
short.
・
sharing the ground with another device may have an adverse effect. Therefore, be sure that
grounding is dedicated.
2.4 Serial Port
The serial port is used to communicate with the PLC or with another type of controller.
Standards available for the signals in the PLC port connector are: RS-232, RS-422 and RS-485.
The serial port is software programmable.
Make sure you select the appropriate interface in the programming software.
To operate in RS485 pins 1-2 and 3-4 must be connected externally.
To connect to the serial port, use a connector provided with the unit.
Suitable wires
Size
Nominal cross sectional area
Rated temperature
AWG24 to 20
0.2 to 0.5mm
2
105
℃
or more
Pin
No.
Pin name
Serial
RS-232C
RS-422
RS-485
1
RX/RXD-
RxD
RXD-
RXD-
2
TX/TXD-
TxD
TXD-
TXD-
3
CTS/RXD+
CTS
RXD+
RXD+
4
RTS/TXD+
RTS
TXD+
TXD+
5
+5V output
-
-
-
6
GND
-
-
-
7
-
-
-
-
8
SHIELD
SHIELD
SHIELD
SHIELD
(Notes)
・
Conversely, depending on your environment, grounding may cause a problem.
・
Since the power line of the HMI unit is connected to a functional earth via electronic
parts, the electronic parts may become damaged if there is an abnormal potential
between the power line and the physical ground.