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VT-MITX-APL | User Manual 17
Pinout description:
Pin
Name
Type
Description
1
DCD4_L
P
POWER
2
RXD4_L
I
RS232_RXD
3
TXD4_L
O
RS232_TXD
4
DTR4
I/O
DTR4
5
GND
P
Ground
6
DSR4
I/O
DSR4
7
RTS4
I/O
RTS4
8
CTS4
I/O
CTS4
9
RI4_L
I/O
RI4_L
2.4.9
J20/J21 RS232/RS422/RS485 port (9)
Next to the two RS232 serial ports are another two serial ports that are used as
RS232/RS422/RS485.
Specification: 2 x 5 x 1.5mm, 5.75mm (H), Male, Vertical, Black, WDT, THR, RoHS
Pinout description:
Pin
Name
Type
Description
1
RS485_A/422TX+
IO
RS485_P
2
RS485_B/422TX-
IO
RS485_N
3
422RX+
IO
DATA
4
422RX-
IO
DATA
5
GND
P
GND
6
DSR1
IO
DATA
7
RTS1
IO
DATA
8
CTS1
IO
DATA
9
RI1_L
IO
DATA
Pin 2
Pin 1