Toho-electronics TTM200 Manuel d'utilisateur télécharger pdf (Page 37)

9. Connections

9.1 RS-485 communications

Host Computer

(Master Station)

Unit1

(Slave Station）

Unit2

(Slave Station）

Unit3

(Slave Station）

A(+)

B(-)

A(+)

B(-)

A(+)

B(-)

A(+)

B(-)

terminating

resistor

①

terminatin

g resistor

②

Cable①

Cable②

Cable③

○Above drawing shows example of connecting 1 to 3 slave stations to a master station.

◇ Use cables with the same characteristic impedance for cables ① to ③.

- For slave station nos. 1 to 3, connect them dependently as shown in the drawing.

The same characteristic impedance cables are used for the connections between

the slave stations.

◇ Attach terminating resistor to both the master station side ① and the farthest ② ones among the

slave stations (no. 3).

◇ Make sure to select terminating resistor in order that the [Characteristic Impedance from cables ①

to ③] = [Resistance Value of ①] = [Resistance Value of ②]

- Furthermore, use characteristic impedance cable whose [Resistance Value of ①] // [Resistance

Value of ②] (parallel combination resistance value) becomes above 75-ohms.

◇ Use a shielded twisted pair cable.

9.2 Loader communications

USBコネクタ

ステレオプラグ

This product

Stereo plug

USB connector

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Toho-electronics TTM200 Manuel d'utilisateur Page 37

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