4. Each Component Function
26
PT-310 User’s manual
RS-422A/485 Serial Port: SERIAL C
Use the software to switch between the half-duplex connection method and the full-duplex connection
method and to switch between RTS and CTS when using the full-duplex connection method.
For details, refer to the software manual.
Table 4.8. Serial Port Connector
Connector type
9-pin D-SUB (MALE)
NoPin No. Signal name
Meaning
Direction
1
GND
Signal ground
-----
2
N.C.
None
-----
3
N.C.
None
-----
4
TxD+
Transmitted data +
Output
5
TxD-
Transmitted data -
Output
6
N.C.
None
-----
7
N.C.
None
-----
8
RxD+
Received data +
Input
9
RxD-
Received data -
Input
Connection Procedure
Figure 4.3. Full-Duplex Connection Method
Figure 4.4. Half-Duplex Connection Method
1
5
9
6
No.4-40UNC
Inch screw threads
COM2
TX_enable
TXD
RXD
RX_enable
TXD+ 4
TXD- 5
RXD+ 8
RXD- 9
COM2
TX_enable
TXD
RXD
RX_enable
TXD+ 4
TXD- 5
RXD+ 8
RXD- 9
