Grounding; Serial Port - Panasonic WHA1 Series User Manual

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.
(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.

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
AWG24 to 20
Pin
No.
1
2
3
4
5
6
7
8
Nominal cross sectional area
0.2 to 0.5mm
PROGRAMMABLE DISPLAY WHA1 Advanced Model
Pin name
RS-232C
RX/RXD-
TX/TXD-
CTS/RXD+
RTS/TXD+
+5V output
GND
-
SHIELD SHIELD
Rated temperature
℃ or more
2
105
4
Serial
RS-422
RxD RXD-
TxD TXD-
CTS RXD+
RTS TXD+
- -
- -
- -
SHIELD
RS-485
RXD-
TXD-
RXD+
TXD+
-
-
-
SHIELD