Advantech MOS-1120Y Series, User Manual

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23 MOS-1120Y/1121Y Series User Manual
Chapter 5
W
iring
Therefore, if not using CTS, RTS, DSR,DTR and DCD signals, short Pins 4 and 5
together and Pins 6, 8, and 20 together.
5.2 RS-422 Signal Wiring
The RS-422 interface wiring is based on the one-to-one principle. The transmit lines
on one side connect to the receive lines on the other side, and vice versa. With RS-
422, data can be transmitted and received simultaneously (full duplex). The connec-
tions are as follows:
Termination Resistor Setup
Termination resistors are included onboard and can be selected by using a jumper for
120 or 300. Each pair of signal lines has a separate resistor (RxD+/-, TxD+/-).
Table 5.3: Terminal Without Handshake
DB-25 Male Terminal, PC (DTE)
Pin Signal Pin Signal
2 TxD 3 RxD
3 RxD 2 TxD
4 RTS
5 CTS
7 GND 7 GND
6 DSR
20 DTR
8 DCD
Table 5.4: RS-422 DB9 Pin Assignment
DTE (Male DB-9) Terminal DTE
Pin Signal Pin Signal
1 TxD- 1 RxD-
2 TxD+ 2 RxD+
3 RxD+ 3 TxD+
4 RxD- 4 TxD-
5 GND 5 GND
6 RTS- 6 CTS-
7 RTS+ 7 CTS+
8 CTS+ 8 RTS+
9 CTS- 9 RTS-