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Chapter 2 Specification of Communication port for CPU module

2 – 5

Communication type

You can specify the following 4 communication types.

Table 2.3 Communication type for ASR communication

Type Description

1 Not used Not perform the transmitting and receiving

2 Transmitting and

receiving

Performs the transmitting and receiving to the other

station.

3 Only transmitting Performs the transmitting to the other station only.

4 Only receiving Performs the receiving only.

Connection type

You can specify the following 5 connection types.

Table 2.4 Connection type for ASR communication

Connection method

1 TCP/IP-Active open

2 TCP/IP-Passive open Specifies for the other station

3 TCP/IP-Passive open Optional for the other station

4 UDP/IP Specified for the other station

5 UDP/IP Optional for the other station

TCP/IP-Active open and TCP/IP-Passive open

When performing the ASR communication using TCP/IP, the logical transmission path for the connection with an

open request should be established between EHV-CPU and the other station in advance. There are two methods to

establish connection, the active open and the passive open.

Table 2.5 Connection method for ASR communication

No Connection method Description

1 Active Open A method to establish connection by transmitting the open request later to the

other station waiting for the connection open.

Active open

Connection

established

Passive open

Connection

established

Waitin g for the

connection open

2 Passive Open A method to establish connection by receiving the open request from the

other station, waiting for the connection open earlier.

Active open

Connection

established

Passive open

Connection

established

Waiting for the

connection open

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