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VT-SBC-3588 | User Manual 22
10
GND
P
Ground
11
485_A_3
RS485_3 A
12
232_TX_3
O
RS232_3 data output
13
485_B_3
RS485_3 B
14
232_RX_3
I
RS232_3 data input
15
485_A_4
RS485_4 A
16
232_TX_4
O
RS232_4 data output
17
485_B_4
RS485_4 B
18
232_RX_4
I
RS232_4 data input
19
GND
P
Ground
20
GND
P
Ground
When the connector is in RS485 mode, the jumpers (JP1, JP2, JP3, JP4) to the left of the
connector are used to connect terminal resistors (120
Ω
) in series respectively for RS485_1,
RS485_2, RS485_3, RS485_4 to prevent signal reflection and improve the signal quality.
Pinout description of JP1:
Pin
Name
Type
Description
1
485_B_1
RS485_1 B, 120
Ω
resistor connection in series
2
485_A_1
RS48_1 A
3
NC
Pinout description of JP2:
Pin
Name
Type
Description
1
485_B_2
RS485_2 B, 120
Ω
resistor connection in series
2
485_A_2
RS48_2 A
3
NC
Pinout description of JP3:
Pin
Name
Type
Description
1
485_B_3
RS485_3 B, 120
Ω
resistor connection in series
2
485_A_3
RS48_3 A
3
NC
Pinout description of JP3:
Pin
Name
Type
Description
1
485_B_4
RS485_4 B, 120
Ω
resistor connection in series
2
485_A_4
RS48_4 A
3
NC
Pin 1