DB9F RS-232 serial interface
Pin
Pin Name
Pin Meaning
1
—
No connection
2
TxD
Data transmit terminal
3
RxD
Data receiving terminal
4
—
No connection
5
GND
Ground Line
6
—
No connection
7
—
No connection
8
—
No connection
9
—
No connection
RS-485 PC Interface:
For SW4485, RS-485 PC port matches 3 terminals,
the pin is defined as follows:
RS-485 terminal
3
Terminal
Pin
Meanin
Signal Instruction
1
D+
+ signal of RS-485 input (out)
2
D-
- signal of RS-485 input (out)
3
GND
Signal Ground
RS-485 lower position controller
port:
For SW4485, RS-485 lower position controller port
matches 10 terminals, pin defined as follows:
RS-485 terminal
10 terminals
Pin
Meaning
Signal Instuction
1
1D+
+ signal of RS-485 input
(out) side
2
1D-
- signal of RS-485 input
(out) side
3
2D+
+ signal of RS-485 input
(out) side
4
2D-
- signal of RS-485 input
(out) side
5
3D+
+ signal of RS-485 input
(out) side
6
3D-
- signal of RS-485 input
(out) side
7
4D+
+ signal of RS-485 input
(out) side
8
4D-
- signal of RS-485 input
(out) side
9
GND
Signal Ground
10
GND
Signal Ground
RS-485 Port fault alarm and protection
RS-485 port fault alarm and protection is the
solution to connect multiple RS-485 devices, an effective
way to enhance its reliability. SW4485 HUB has 4 lower
position controller ports, and each port has reverse
connect protection function, and can work in shutdown
mode. Any RS-485 port
reverse connection will only
affect its RS-485 BUS system, will not affect the normal
work of other interface connected with RS-485 system.
Users can quickly determine fault port and other
connected devices according to the fault alarm light.
Note: The connection of
lower position controller
ports of the same SW4485 HUB is wrong
connection.
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LED Indicator
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