Ver.1.02

COM-4PDHN-USB

4

- First, connect 12 - 24VDC power supply to the product. Next,

connect the USB cable to the PC.

Do not power on or off when using the product. When removing,

first remove the USB cable, and then disconnect 12 - 24VDC power

supply.

- When the USB module is not used, leave the AC adapter

unplugged.

- Continuously using the AC adapter heated affects its life.

- Use the AC adapter not in a closed place but in a well-ventilated

place not to be heated.

- Do not remove the 3-pin power connector attached to the AC

adapter.

Connection Method

Interface Connector

Use the interface connectors of the product to connect with external

devices.

Connector Pin Assignment

To connect the product directly to the external devices, make your own

cable and connect it to the external device using the provided 5-pin

RS422A/485 connector.

Pin Assignment

Signal name

Meaning

TxD+

Transmission data (+)

TxD-

Transmission data (-)

RxD+

Reception data (+)

RxD-

Reception data (-)

SG

Signal ground

Types of Cable and Example Connections

The figures below show examples of how to connect the cable for the

product.

The RS-422A/485 interface works based on a differential signal

whereby the signal is carried by the potential difference between two

lines (+ and -). Using twisted pair cable is recommended to improve

resistance to noise.

Example Connection Oneself loop to RTS and CTS in Full Duplex

Example Connection in Half Duplex

POA-201-10-2

Power input connector

COM-4PDHN-USB

USB I/O Terminal

Isolated R

S-422A/485 4ch I/O Unit

V+ V -

CAUTION

CH4

CH3

CH2

CH1

- Connector used

　

MC 1,5/5-G-3,5 equivalent [PHOENIX CONTACT]

- Applicable connectors

　

MC 1,5/5-ST-3,5 equivalent [PHOENIX CONTACT]

- Applicable wire　AWG28-16

TxD+

TxD-

RxD+

RxD-

SG

External device

RxD

TxD

TxD+

RxD+

SG

RxD

TxD

TxD+

RxD+

SG

External device

TxD

TxD+

SG

TxD

TxD+

SG