A&D AD-4408A Instruction Manual download pdf (Page 8)

3.2 . Connections and Functions

3.2.1. Cable Connections

By connector pin connections, a signal level can be selected either for RS-232 or

RS-485.

When the signal level is RS-485, add a terminator to both ends of the network. Place

a terminator between A and B as shown in the figure below.

The A-B terminals of the host device may be reversed, depending on the device

type.

When the host device has no SG terminal, an SG connection is not necessary.

When the cable is to be shielded, connect the cable shield to the connector housing.

Fig.5 Example of RS-485 multidrop connection

D-4408

No.1

Housing

(

FG)

Host device

D-4408

No.2

AD-4408A

No.31

Terminato

100Ω 1/2W

Terminato

100-120Ω 1/2W

Place a terminator on the

device located furthest from

the host device.

Some host devices may have a

terminator built in.

The A-B terminals of the host device

may be reversed, depending on the

device type.

Use a twisted pair cable for a signal

line.

Use a shielded cable as necessary.

Housing

(

FG)

Housing

(

FG)

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 21 22

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A&D AD-4408A Instruction Manual Page 8