RTS WM300 Spécifications télécharger pdf (Page 65)

Chapter 2 Specification of Communication port for CPU module

2 – 51

2.3.6 Connection method for RS-422 / 485 communication

Serial communication port of EHV-CPU can communicate with an interface of RS-422 / 485. Communication of

1:N stations can be performed using H-series dedicated control procedure (high-protocol) or a general-purpose

procedure with a general-purpose port command (TRNS 0, RECV 0). Figure 2.30 and 2.31 show examples when a

connection is made for 1:N stations.

And the connection for the communication in 1:1 made is the connection of only the first EHV-CPU.

(1) In case of RS-422

EHV-CPU

(32nd CPU)

EHV-CPU

(2nd CPU)

EHV-CPU

(1st CPU)

Host

SD (-)

SD (+)

RD (+)

RD (-)

Relay terminal

block

Relay terminal

block

Relay terminal

block

[7] RX

[6] RXN

[5] TXN

[4] TX

[7] RX

[6] RXN

[5] TXN

[4] TX

[7] RX

[6] RXN

[5] TXN

[4] TX

Figure 2.39 Connection for 1:N station communication by RS-422

(2) In case of RS-485

EHV-CPU

(32nd CPU)

EHV-CPU

(2nd CPU)

EHV-CPU

(1st CPU)

Host

SD (-)

[7] RX

[6] RXN

[5] TXN

[4] TX

SD (+)

RD (+)

RD (-)

Relay terminal

block

Relay terminal

block

Relay terminal

block

Twist pair cable

[7] RX

[6] RXN

[5] TXN

[4] TX

[7] RX

[6] RXN

[5] TXN

[4] TX

Figure 2.40 Connection for 1:N station communication by RS-485

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RTS WM300 Spécifications Page 65

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