Mitsubishi-electric QJ71C24N Manuel d'utilisateur télécharger pdf (Page 177)

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MELSEC-Q

7 DATA COMMUNICATIONS USING BIDIRECTIONAL PROTOCOL

(4) Transmission: invalid, reception: invalid

Q series C24

External device

2)-1

1)-1

Ignores the receive

data of 1)-1.

Generates a simultaneous

transmission error.

Ignores the receivedata of 2)-1.

Arbitrary data

Sum check

code

Arbitrary data

Sum check

code

REMARK

Time-check timer 1 (response monitoring time) shown in the illustration is described

in Section 6.2 of User's Manual (Application).

POINT

When the transmission control (see Chapter 9 of User's Manual (Application)) is

performed, and the simultaneous transmission data valid/invalid designation sets

that the receive data is valid and transmission data is valid, the Q series C24

performs message transmission and message reception processing as described

below.

During message transmission processing, time check by timer 1 (response

monitoring time) is performed.

1) Message transmission (1)-1 in the illustration)

• If the Q series C24 receives a terminate transmission request (DC3

received/DSR signal OFF) from the external device during message

transmission, it terminates data transmission.

• When the Q series C24 receives the ready to send signal (DC1

received/DSR signal ON), it restarts data transmission.

2) Message reception

• If the Q series C24 cannot send a response message to the external device

in response to message reception because the external device issued a

terminate transmission request (DC3 received/DSR signal OFF), it transmits

the response message after it receives the ready to send signal (DC1

received/DSR signal ON) from the external device.

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Mitsubishi-electric QJ71C24N Manuel d'utilisateur Page 177