Connection
22
3
TXD (Transmit data)
3
RXD (Receive data)
5
GND (Grounding)
5
GND (Grounding)
4.5 Grounding
Grounding protects the switch from lightning and interference. Therefore, you must ground
the switch properly. You need to ground the switch before it is powered on and disconnect
the grounding cable after the switch is powered off.
The switch provides a grounding screw on the top panel for chassis grounding. After
crimping one end of the grounding cable to a cold pressed terminal, secure the end to the
grounding screw and connect the other end to the earth firmly.
Note
：
Cross-sectional area of the chassis grounding cable>2.5mm
2
; grounding resistance<5
.
4.6 Power Terminal Block
3-Pin 7.62mm-Spacing Plug-in Terminal Block
Figure 27 3-Pin 7.62mm-Spacing Plug-in Terminal Block (socket)
Table 8 Pin Definitions of 3-Pin 7.62mm-Spacing Plug-in Terminal Block
No.
DC Definition
AC Definition
1
PWR
：
+
PWR
：
L
2
PWR
：
-
PWR
：
N
3
PGND
PGND
There is a power terminal block on the top panel of the device. You need to connect the
